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Document and Entity Information - shares	6 Months Ended
Document and Entity Information - shares	Jun. 30, 2018	Jul. 31, 2018
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q2
Trading Symbol	CBZ
Entity Registrant Name	CBIZ, Inc.
Entity Central Index Key	0000944148
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		55,323,170

Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 1,921	$ 424
Restricted cash	39,535	32,985
Accounts receivable, net	245,639	188,300
Income taxes refundable/receivable		813
Other current assets	27,873	22,539
Current assets before funds held for clients	314,968	245,061
Funds held for clients	131,304	203,112
Total current assets	446,272	448,173
Non-current assets:
Property and equipment, net	28,649	26,081
Goodwill and other intangible assets, net	640,312	613,206
Assets of deferred compensation plan	89,987	85,589
Notes receivable	906	620
Other non-current assets	3,998	2,562
Total non-current assets	763,852	728,058
Total assets	1,210,124	1,176,231
Current liabilities:
Accounts payable	80,823	51,375
Income taxes payable	6,987
Accrued personnel costs	42,750	45,264
Notes payable	1,632	1,861
Contingent purchase price liability	27,344	15,151
Other current liabilities	13,587	17,013
Current liabilities before client fund obligations	173,123	130,664
Client fund obligations	132,289	203,582
Total current liabilities	305,412	334,246
Non-current liabilities:
Bank debt	180,200	178,500
Debt issuance costs	(1,707)	(828)
Total long-term debt	178,493	177,672
Notes payable	1,653	2,164
Income taxes payable	4,574	4,454
Deferred income taxes, net	4,000	3,339
Deferred compensation plan obligations	89,987	85,589
Contingent purchase price liability	19,184	22,423
Other non-current liabilities	17,995	15,465
Total non-current liabilities	315,886	311,106
Total liabilities	621,298	645,352
STOCKHOLDERS' EQUITY
Common stock	1,311	1,301
Additional paid in capital	686,983	675,504
Retained earnings	395,881	345,302
Treasury stock	(495,455)	(491,046)
Accumulated other comprehensive income (loss)	106	(182)
Total stockholders’ equity	588,826	530,879
Total liabilities and stockholders’ equity	$ 1,210,124	$ 1,176,231

Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement Of Income And Comprehensive Income [Abstract]
Revenue	$ 232,641	$ 211,016	$ 498,731	$ 452,475
Operating expenses	205,102	188,120	409,852	380,886
Gross margin	27,539	22,896	88,879	71,589
Corporate general and administrative expenses	9,993	9,232	20,021	18,000
Operating income (loss)	17,546	13,664	68,858	53,589
Other (expense) income:
Interest expense	(1,817)	(1,692)	(3,597)	(3,209)
Gain on sale of operations, net		23	663	45
Other income (expense), net	630	3,764	(599)	6,501
Total other (expense) income, net	(1,187)	2,095	(3,533)	3,337
Income from continuing operations before income tax expense	16,359	15,759	65,325	56,926
Income tax expense	3,238	4,343	16,394	20,484
Income from continuing operations	13,121	11,416	48,931	36,442
(Loss) gain from discontinued operations, net of tax	(15)	(418)	26	(570)
Net income	$ 13,106	$ 10,998	$ 48,957	$ 35,872
Basic:
Continuing operations	$ 0.24	$ 0.21	$ 0.90	$ 0.68
Discontinued operations		(0.01)		(0.01)
Net income	0.24	0.20	0.90	0.67
Diluted:
Continuing operations	0.23	0.20	0.87	0.66
Discontinued operations		(0.01)		(0.01)
Net income	$ 0.23	$ 0.19	$ 0.87	$ 0.65
Basic weighted average shares outstanding	54,594	53,968	54,334	53,632
Diluted weighted average shares outstanding	56,437	55,831	56,166	55,530
Comprehensive income:
Net income	$ 13,106	$ 10,998	$ 48,957	$ 35,872
Other comprehensive income, net of tax	174	37	288	217
Comprehensive income	$ 13,280	$ 11,035	$ 49,245	$ 36,089

Consolidated Statements of Stockholders' Equity (Unaudited) - 6 months ended Jun. 30, 2018 - USD ($) shares in Thousands, $ in Thousands	Total	Previously Reported [Member]	Cumulative Effect Adjustment [Member]	Common Stock [Member]	Common Stock [Member] Previously Reported [Member]	Treasury Stock [Member]	Treasury Stock [Member] Previously Reported [Member]	Additional Paid-In Capital [Member]	Additional Paid-In Capital [Member] Previously Reported [Member]	Retained Earnings [Member]	Retained Earnings [Member] Previously Reported [Member]	Retained Earnings [Member] Cumulative Effect Adjustment [Member]	Accumulated Other Comprehensive (Loss) Gain [Member]	Accumulated Other Comprehensive (Loss) Gain [Member] Previously Reported [Member]
Balance, Amount at Dec. 31, 2017	$ 530,879	$ 530,879	$ 1,622		$ 1,301		$ (491,046)		$ 675,504		$ 345,302	$ 1,622		$ (182)
Balance, Amount (Accounting Standards Update 2014-09 [Member]) at Dec. 31, 2017	532,501			$ 1,301		$ (491,046)		$ 675,504		$ 346,924			$ (182)
Balance, Shares at Dec. 31, 2017					130,075		75,484
Balance, Shares (Accounting Standards Update 2014-09 [Member]) at Dec. 31, 2017				130,075		75,484
Net income	48,957									48,957
Other comprehensive income	288												288
Share repurchases	(4,409)					$ (4,409)
Share repurchases, Shares						219
Restricted stock				$ 4				(4)
Restricted stock, Shares				272
Stock options exercised	$ 4,425			$ 5				4,420
Stock options exercised, Shares	616			616
Share-based compensation	$ 3,850							3,850
Business acquisitions	3,214			$ 1				3,213
Business acquisitions, Shares				169
Balance, Amount at Jun. 30, 2018	$ 588,826			$ 1,311		$ (495,455)		$ 686,983		$ 395,881			$ 106
Balance, Shares at Jun. 30, 2018				131,132		75,703

Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Cash flows from operating activities:
Net income	$ 48,957	$ 35,872
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization expense	11,676	11,279
Bad debt expense, net of recoveries	3,172	2,439
Adjustment to contingent earnout liability	3,050	(756)
Stock-based compensation expense	3,850	2,790
Other noncash adjustments	(2,840)	(1,115)
Changes in assets and liabilities, net of acquisitions and divestitures:
Accounts receivable, net	(44,774)	(40,997)
Other assets	(4,955)	(263)
Accounts payable	18,796	14,376
Income taxes payable	10,245	8,762
Accrued personnel costs	(3,302)	(9,598)
Other liabilities	(2,617)	1,989
Operating cash flows provided by continuing operations	41,258	24,778
Operating cash flows used in discontinued operations	(152)	(540)
Net cash provided by operating activities	41,106	24,238
Cash flows from investing activities:
Business acquisitions and purchases of client lists, net of cash acquired	(23,740)	(26,561)
Purchases of client fund investments	(10,345)	(11,788)
Proceeds from the sales and maturities of client fund investments	7,273	4,375
Increase in funds held for clients	74,428	72,417
Additions to property and equipment, net	(5,493)	(6,749)
Collection of notes receivable	348	63
Net cash provided by investing activities	42,471	31,757
Cash flows from financing activities:
Proceeds from bank debt	439,000	308,000
Payment of bank debt	(437,300)	(288,800)
Payment for acquisition of treasury stock	(4,409)	(5,675)
Decrease in client funds obligations	(71,293)	(65,041)
Proceeds from exercise of stock options	4,425	5,649
Payment of contingent consideration for acquisitions	(4,632)	(5,211)
Other, net	(1,321)	(206)
Net cash used in financing activities	(75,530)	(51,284)
Net increase in cash, cash equivalents and restricted cash	8,047	4,711
Cash, cash equivalents and restricted cash at beginning of year	33,409	31,374
Cash, cash equivalents and restricted cash at end of period	$ 41,456	$ 36,085

Summary of Significant Accounting Policies	6 Months Ended
Summary of Significant Accounting Policies	Jun. 30, 2018
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Note 1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Description of Business: CBIZ, Inc. is a diversified services company which, acting through its subsidiaries, has been providing professional business services since 1996, primarily to small and medium-sized businesses, as well as individuals, governmental entities, and not-for-profit enterprises throughout the United States and parts of Canada. CBIZ, Inc. manages and reports its operations along three practice groups; Financial Services, Benefits and Insurance Services and National Practices. A further description of products and services offered by each of the practice groups is provided in Note 16, Segment Disclosures, to the accompanying consolidated financial statements. Basis of Consolidation: The accompanying unaudited condensed consolidated financial statements include the operations of CBIZ, Inc. and all of its wholly-owned subsidiaries (“CBIZ”, the “Company”, “we”, “us”, or “our”), after elimination of all intercompany balances and transactions. These condensed consolidated financial statements do not reflect the operations or accounts of variable interest entities as the impact is not material to the financial condition, results of operations or cash flows of CBIZ. Unaudited Interim Financial Statements: The condensed consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States (“GAAP”) and applicable rules and regulations of the Securities and Exchange Commission (the “SEC”) regarding interim financial reporting. Certain information and note disclosures normally included in the financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations. As such, the information included in this quarterly report on Form 10-Q should be read in conjunction with the consolidated financial statements and accompanying notes included in our Annual Report on Form 10-K for the fiscal year ended December 31, 2017. In the opinion of CBIZ management, the accompanying condensed consolidated financial statements reflect all normal recurring adjustments necessary to present fairly the financial condition, results of operations, and cash flows for the interim periods presented, but are not necessarily indicative of the results of operations to be anticipated for the full year ending December 31, 2018. Use of Estimates: The preparation of condensed consolidated financial statements in conformity with GAAP requires us to make estimates and assumptions that affect the amounts reported and disclosed in the financial statements and the accompanying notes. Changes in circumstances could cause actual results to differ materially from these estimates. Changes in Accounting Policies: We have consistently applied the accounting policies for the periods presented as described in Note 1, Basis of Presentation and Significant Accounting Policies, to the consolidated financial statements contained in our Annual Report on Form 10-K for the fiscal year ended December 31, 2017. Effective January 1, 2018, we adopted Accounting Standards Update (“ASU”) No. 2015-14, “Revenue from Contracts with Customers” (“Topic 606”). As a result, we have changed our accounting policy for revenue recognition as described below in Note 2, New Accounting Pronouncements.

New Accounting Pronouncements

6 Months Ended

Jun. 30, 2018

Accounting Changes And Error Corrections [Abstract]

New Accounting Pronouncements

NOTE 2. New Accounting Pronouncements

The Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) is the sole source of authoritative GAAP other than the SEC issued rules and regulations that apply only to SEC registrants. The FASB issues an accounting standard to communicate changes to the FASB codification. We assess and review the impact of all accounting standards. Any accounting standards not listed below were reviewed and determined to be either not applicable or are not expected to have a material impact on the consolidated financial statements of the Company.

Accounting Standards Adopted in 2018

Modification Accounting for Share-Based Payment Awards: Effective January 1, 2018, we adopted ASU No. 2017-09, “Compensation – Stock Compensation (Topic 718) – Scope of Modification Accounting.” The new standard clarifies when a change to the terms or conditions of a share-based payment award must be accounted for as a modification. Modification accounting is required if the fair value, vesting condition or the classification of the award is not the same immediately before and after a change to the terms and conditions of the award. We typically do not change either the terms or conditions of share-based payment awards once they are granted; therefore, the adoption of this new guidance had no impact on our consolidated financial statements.

Restricted Cash - Statement of Cash Flows: Effective January 1, 2018, we adopted ASU No. 2016-18, “Statement of Cash Flows (Topic 230).” The new standard requires that a statement of cash flows explain the change during the period in the total of cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents. Therefore, restricted cash should be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. When restricted cash is presented separately from cash and cash equivalents on the balance sheet, a reconciliation is required between the amounts presented on the statement of cash flows and the balance sheet, as well as a disclosure of information about the nature of the restrictions. The adoption of this new standard resulted in a decrease of $6.6 million and $7.0 million in cash used in operating activities for the six months ended June 30, 2018 and 2017, respectively.

Restricted cash consists of funds held by us in relation to our capital and investment advisory services as those funds are restricted in accordance with applicable Financial Industry Regulatory Authority regulations. Restricted cash also consists of funds on deposit from clients in connection with the pass-through of insurance premiums to the carrier with the related liability for these funds recorded in “Accounts payable” in the accompanying Consolidated Balance Sheets.

The following table provides a reconciliation of cash, cash equivalents and restricted cash as reported in the accompanying Consolidated Balance Sheets that sum to the total of the same such amount shown in the accompanying Consolidated Statements of Cash Flows (in thousands):

	June 30		June 30
	2018		2017
Cash and cash equivalents	$	1,921	$	1,161
Restricted cash		39,535		34,924
Total cash, cash equivalents and restricted cash	$	41,456	$	36,085

Statement of Cash Flows: Effective January 1, 2018, we adopted ASU No. 2016-15, “Statement of Cash Flows (Topic 230) – Classification of Certain Cash Receipts and Cash Payments.” The new standard provides guidance on eight specific cash flow issues. The application of this guidance did not have a material effect on the presentation of our Statement of Cash Flows.

Revenue from Contracts with Customers: Effective January 1, 2018, we adopted Topic 606 using the modified retrospective transition method. We recognized the cumulative effect of initially applying the new standard as an adjustment directly to the opening balance of “Retained earnings” at January 1, 2018. The comparative information has not been restated and continues to be reported under the legacy standard.

We evaluate our revenue contracts with customers based on the five-step model under Topic 606, pursuant to which we: (i) identify the contract with the customer; (ii) identify the performance obligation in the contract; (iii) determine the contract price; (iv) allocate the transaction price; and (v) recognize revenue when as each performance obligation is satisfied. If we determine that a contract with enforceable rights and obligations does not exist, revenues are deferred until all criteria for an enforceable contract are met.

Revenue recognition is consistent under both the legacy standard and Topic 606 for the majority of our revenue streams, with the exception of two business units within our Benefits and Insurance Services practice group. The revenue recognition policies in our Benefits and Insurance Services practice group have been modified under the new standard as follows.

•

In our Property and Casualty business unit, commission revenue under agency billing arrangements (pursuant to which we bill the insured, collect the funds and remit the premium to the insurance carrier less our commissions) was previously recognized as of the later of the effective date of the insurance policy or the date billed to the customer. We now recognize the commission revenue on the effective date of the insurance policy.

Also in our Property and Casualty business unit, commission revenue under direct billing arrangements (pursuant to which the insurance carrier bills the insured directly and remits the commissions to us) was previously recognized when the data necessary from the carriers was available, whereas now we recognize the commission revenue on the effective date of the insurance policy.

•

In our Retirement Plan Services business unit, certain defined benefit administration arrangements charge new clients an initial, non-refundable, set-up fee as part of a multi-year service agreement. Previously, these fees were recognized over the initial set up period, whereas now we defer the set-up fees and associated costs and recognize them over the life of the contract or the expected customer relationship, whichever is longer.

The cumulative effect of the changes made to our consolidated January 1, 2018 balance sheet was as follows (in thousands):

	Balance at		Adjustments		Balance at
	December 31,		due to		January 1,
Balance Sheet	2017		Topic 606		2018
ASSETS
Accounts receivable, net	$	188,300	$	9,446	$	197,746
Other current assets		259,873		80		259,953
Other non-current assets		728,058		728		728,786
Total assets	$	1,176,231	$	10,254	$	1,186,485
LIABILITIES
Accounts payable		51,375		6,281		57,656
Accrued personnel costs		45,264		595		45,859
Other current liabilities		237,607		113		237,720
Deferred income taxes, net		3,339		631		3,970
Other non-current liabilities		307,767		1,012		308,779
Total liabilities		645,352		8,632		653,984
STOCKHOLDERS' EQUITY
Retained earnings		345,302		1,622		346,924
Other stockholders' equity		185,577		—		185,577
Total stockholders' equity		530,879		1,622		532,501
Total liabilities and stockholders' equity	$	1,176,231	$	10,254	$	1,186,485

The following tables summarize the impact of adopting Topic 606 on our consolidated financial statements for the periods indicated below (in thousands):

						Balances without
Second Quarter 2018 Balance Sheet	As reported		Adjustments			adoption of Topic 606
ASSETS
Accounts receivable, net	$	245,639	$	(11,886	)	$	233,753
Other current assets		200,633		(80	)		200,553
Other non-current assets		763,852		(687	)		763,165
Total assets	$	1,210,124	$	(12,653	)	$	1,197,471
LIABILITIES
Accounts payable	$	80,823	$	(7,799	)	$	73,024
Accrued personnel costs		42,750		(582	)		42,168
Other current liabilities		181,839		(114	)		181,725
Deferred income taxes, net		4,000		(870	)		3,130
Other non-current liabilities		311,886		(953	)		310,933
Total liabilities		621,298		(10,318	)		610,980
STOCKHOLDERS' EQUITY
Retained earnings		395,881		(2,335	)		393,546
Other stockholders' equity		192,945		—			192,945
Total shareholders' equity		588,826		(2,335	)		586,491
Total liabilities and stockholders' equity	$	1,210,124	$	(12,653	)	$	1,197,471

							Balances without
Three Months Ended June 30, 2018 Income Statement	As reported			Adjustments			adoption of Topic 606
Revenue	$	232,641		$	(483	)	$	232,158
Operating expenses		205,102			44			205,146
Gross margin		27,539			(527	)		27,012
Corporate general and administrative expenses		9,993			—			9,993
Operating income		17,546			(527	)		17,019
Other (expense) income:
Interest expense		(1,817	)		—			(1,817	)
Gain on sale of operations, net		—			—			—
Other income, net		630			—			630
Total other expense, net		(1,187	)		—			(1,187	)
Income from continuing operations before income tax expense		16,359			(527	)		15,832
Income tax expense		3,238			(125	)		3,113
Income from continuing operations		13,121			(402	)		12,719
Loss from discontinued operations, net of tax		(15	)		—			(15	)
Net income	$	13,106		$	(402	)	$	12,704

							Balances without
Six Months Ended June 30, 2018 Income Statement	As reported			Adjustments			adoption of Topic 606
Revenue	$	498,731		$	(981	)	$	497,750
Operating expenses		409,852			(29	)		409,823
Gross margin		88,879			(952	)		87,927
Corporate general and administrative expenses		20,021			—			20,021
Operating income		68,858			(952	)		67,906
Other (expense) income:
Interest expense		(3,597	)		—			(3,597	)
Gain on sale of operations, net		663			—			663
Other expense, net		(599	)		—			(599	)
Total other expense, net		(3,533	)		—			(3,533	)
Income from continuing operations before income tax expense		65,325			(952	)		64,373
Income tax expense		16,394			(239	)		16,155
Income from continuing operations		48,931			(713	)		48,218
Gain from discontinued operations, net of tax		26			—			26
Net income	$	48,957		$	(713	)	$	48,244

							Balances without
Six Months Ended June 30, 2018 Cash Flow Statement	As reported			Adjustments			adoption of Topic 606
Cash flows from operating activities:
Net income	$	48,957		$	(713	)	$	48,244
Adjustments to reconcile net income to net cash provided by operating activities:		18,908			—			18,908
Changes in assets and liabilities, net of acquisitions and divestitures:								—
Accounts receivable, net		(44,774	)		2,440			(42,334	)
Other assets		(4,955	)		(41	)		(4,996	)
Accounts payable		18,796			(1,518	)		17,278
Accrued personnel costs		(3,302	)		13			(3,289	)
Other liabilities		(2,617	)		(181	)		(2,798	)
Other		10,245			—			10,245
Operating cash flows provide by continuing operations		41,258			—			41,258
Operating cash flows used in discontinued operations		(152	)		—			(152	)
Net cash provided by operating activities		41,106			—			41,106
Net provided by investing activities		42,471			—			42,471
Net cash used in financing activities		(75,530	)		—			(75,530	)
Net increase in cash, cash equivalents and restricted cash		8,047			—			8,047
Cash, cash equivalents and restricted cash at beginning of year		33,409			—			33,409
Cash, cash equivalents and restricted cash at end of period	$	41,456			—		$	41,456

Accounting Standards Not Yet Adopted

Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income: In February 2018, the FASB issued ASU No. 2018-02, “Income Statement – Reporting Comprehensive Income (Topic 220)” which allows the reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the Tax Cuts and Jobs Act of 2017. The new standard is effective for fiscal years beginning after December 15, 2018, including interim periods, with early adoption permitted. We do not expect this guidance to have a material impact on our consolidated financial position or results of operations.

Derivatives and Hedging: In August 2017, the FASB issued ASU No. 2017-12, “Derivatives and Hedging (Topic 815) - Targeted Improvements to Accounting for Hedging Activities.” The new standard improves and simplifies accounting rules for hedge accounting to better present the economic results of an entity’s risk management activities in its financial statements and improves the disclosures of hedging arrangements. Additionally, it simplifies the hedge documentation and effectiveness assessment requirements. The updated guidance is effective for us beginning January 1, 2019. We do not expect this guidance to have a material impact on our consolidated financial position or results of operations.

Leases: In February 2016, the FASB issued ASU No. 2016-02, “Leases (Topic 842)” which supersedes ASC Topic 840, “Leases.” The new standard requires lessees to recognize a right-of-use asset and a lease on the balance sheet for all leases except for leases with a term of 12 months or less. For lessees, leases will continue to be classified as either operating or finance leases. Operating leases will result in straight-line expense while finance leases will result in a front-loaded expense pattern. We plan to adopt the standard on its effective date of January 1, 2019 and apply the package of practical expedients available to us upon adoption. The new standard requires a “modified retrospective” adoption, meaning the standard is applied to leases existing at, or entered into after, the beginning of the earliest comparative period presented in the financial statements.

We are currently evaluating and compiling a list of our real estate leases and other leases and analyzing the key lease agreement terms. Based on our analysis to date, we expect the new standard to have a material effect on our consolidated balance sheet. Based on the future minimum payments under non-cancellable operating leases as of June 30, 2018, we would expect to record approximately $200 million of lease related assets, discounted to fair value, on our consolidated balance sheet to both our assets and liabilities, with no impact on our equity. The new standard is not expected to have a material impact on our results of operations, our liquidity or our debt covenant compliance under our current credit agreements.

Revenue

6 Months Ended

Jun. 30, 2018

Revenue Recognition [Abstract]

Revenue

Note 3. Revenue

In accordance with the new revenue recognition standard requirements, the following table disaggregates our revenue by source (in thousands):

	Three Months Ended June 30, 2018
	Financial		Benefits &		National
	Services		Insurance		Practices		Consolidated
Accounting, tax, advisory and consulting	$	151,737	$	—	$	—	$	151,737
Core Benefits and Insurance Services		—		68,978		—		68,978
Non-core Benefits and Insurance Services		—		3,775		—		3,775
Managed networking, hardware services		—		—		6,121		6,121
National Practices consulting		—		—		2,030		2,030
Total revenue	$	151,737	$	72,753	$	8,151	$	232,641

	Six Months Ended June 30, 2018
	Financial		Benefits &		National
	Services		Insurance		Practices		Consolidated
Accounting, tax, advisory and consulting	$	332,340	$	—	$	—	$	332,340
Core Benefits and Insurance Services		—		143,100		—		143,100
Non-core Benefits and Insurance Services		—		6,983		—		6,983
Managed networking, hardware services		—		—		12,079		12,079
National Practices consulting		—		—		3,999		3,999
Other		—		—		230		230
Total revenue	$	332,340	$	150,083	$	16,308	$	498,731

Financial Services

Revenue primarily consists of professional service fees derived from traditional accounting services, tax return preparation, administrative services, financial and risk advisory, consulting and valuation services. Clients are billed for these services based upon a fixed-fee, an hourly rate, or an outcome-based fee. Time related to the performance of all services is maintained in a time and billing system.

Revenue for fixed-fee arrangements is recognized over time with the performance obligation measured in hours worked and anticipated realization. Time and expense arrangement revenue is recognized over time with progress measured towards completion with value being transferred through our hourly fee arrangement at expected net realizable rates per hour, plus agreed-upon out-of-pocket expenses (in accordance with practical expedient ASC 606-10-55-18). The cumulative impact on any subsequent revision in the estimated realizable value of unbilled fees for a particular client project is reflected in the period in which the change becomes known. Outcome-based arrangement revenue is fully constrained and recognized when the constraint is lifted at a point in time when the value is determined and verified by a third party.

Benefits and Insurance Services

Core Benefits and Insurance Services consists of group health benefits consulting, property and casualty, retirement plan services and payroll processing services. Revenue consists primarily of fee income for administering health and retirement plans and brokerage and agency commissions. Revenue also includes investment income related to client payroll funds that are held in CBIZ accounts, as is industry practice. Under the new revenue recognition standard, the cost to obtain a contract must be capitalized unless the contract period is one year or less. We have applied a practical expedient related to commissions paid internally and continue to expense the commissions as incurred since the majority of our contract periods are one year or less.

Revenue related to group health benefits consulting consists of (i) commissions, (ii) fee income which can be fixed or variable based on a price per participant and (iii) contingent revenue.

•

Commission revenue and fee income are recognized over the contract period as these services are provided to clients continuously throughout the term of the arrangement. Our customers benefit from each month of service on its own and although volume and the number of participants may differ month to month, the obligation to perform substantially remains the same.

•

Contingent revenue arrangements are related to carrier-based performance targets. Due to the uncertainty of the outcome and the probability that a change in estimate would result in a significant reversal of revenue, we have applied a constraint on recording contingent revenue. Revenue will be recognized when the constraint has been lifted which is the earlier of written notification that the target has been achieved or cash collection. Contingent revenue is not a significant revenue stream to our consolidated financial position or results of operations.

Revenue related to property and casualty consists of (i) commissions and (ii) contingent revenue.

•

Commissions relating to agency billing arrangements (pursuant to which we bill the insured, collect the funds and forward the premium to the insurance carrier less our commission) and direct billing arrangements (pursuant to which the insurance carrier bills the insured directly and forwards the commission to us) are both recognized on the effective date of the policy. Commission revenue is reported net of reserves for estimated policy cancellations and terminations. The cancellation and termination reserve is based upon estimates and assumptions using historical cancellation and termination experience and other current factors to project future experience.

•

Contingent revenue arrangements related to carrier-based performance targets include claim loss experience and other factors. Due to the uncertainty of the outcome and the probability that a change in estimate would result in a significant reversal of revenue, we have applied a constraint on recording contingent revenue. Revenue will be recognized when the constraint has been lifted which is the earlier of written notification that the target has been achieved or cash collection. Contingent revenue is not a significant revenue stream to our consolidated financial position or results of operations.

Revenue related to retirement plan services consist of advisory, third party administration, and actuarial services.

•

Advisory revenue is based on the value of assets under management with fees recognized when the quarterly data becomes available.

•

Third party administration revenue is recognized over the contract period as these services are provided to clients continuously throughout the term of the arrangement. Our clients benefit from each month of service on its own and although volume may differ month to month, the obligation to perform substantially remains the same.

•

Actuarial revenue is recognized over the contract period with performance measured in hours in relation to the expected total hours. Under certain defined benefit plan administration arrangements, we charge new clients an initial, non-refundable, set-up fee as part of a multi-year service agreement. Revenue and costs related to the set-up fees are deferred and recognized over the life of the contract or the expected customer relationship, whichever is longer.

Revenue related to payroll processing consists of a (i) fixed fee or (ii) variable fee based on a price per employee or check processed. Revenue is recognized when the actual payroll processing occurs. Our customers benefit from each month of service on its own and although volume and the variability may differ month to month, the obligation to perform substantially remains the same.

Non-core Benefits and Insurance Services consists of transactional businesses that tend to fluctuate. These include life insurance, wholesale agency benefits and talent and compensation services.

National Practices

Managed networking, hardware services revenue consists of installation, maintenance and repair of computer hardware. These services are charged to a single customer based on cost plus an agreed-upon markup percentage, which has existed since 1999.

National Practices consulting revenue is based upon a fixed fee, an hourly rate, or a percentage of savings. Revenue for fixed fee and time and expense arrangements is recognized over the performance period based upon actual hours incurred.

Transaction Price Allocated to Future Obligations

The new revenue recognition standard requires us to disclose the aggregate amount of transaction price allocated to performance obligations that have not yet been satisfied as of June 30, 2018. The guidance provides certain practical expedients that limit this requirement, including performance obligations that are part of a contract that is one year or less. Since the majority of our contracts are one year or less, we have applied this practical expedient related to quantifying remaining performance obligations.

Accounts Receivable, Net

6 Months Ended

Jun. 30, 2018

Receivables [Abstract]

Accounts Receivable, Net

Note 4. Accounts Receivable, Net

Accounts receivable, net, at June 30, 2018 and December 31, 2017 were as follows (in thousands):

	June 30,			December 31,
	2018			2017
Trade accounts receivable	$	181,572		$	139,730
Unbilled revenue, at net realizable value		79,527			62,397
Total accounts receivable		261,099			202,127
Allowance for doubtful accounts		(15,460	)		(13,827	)
Accounts receivable, net	$	245,639		$	188,300

- Definition

The entire disclosure for claims held for amounts due a entity, excluding financing receivables. Examples include, but are not limited to, trade accounts receivables, notes receivables, loans receivables. Includes disclosure for allowance for credit losses.

+ References + Details

Goodwill and Other Intangible Assets, Net

6 Months Ended

Jun. 30, 2018

Goodwill And Intangible Assets Disclosure [Abstract]

Goodwill and Other Intangible Assets, Net

Note 5. Goodwill and Other Intangible Assets, Net

The components of goodwill and other intangible assets, net, at June 30, 2018 and December 31, 2017 were as follows (in thousands):

	June 30,			December 31,
	2018			2017
Goodwill	$	560,688		$	528,424
Intangible assets:
Client lists		180,070			177,221
Other intangible assets		9,366			8,767
Total intangible assets		189,436			185,988
Total goodwill and intangibles assets		750,124			714,412
Accumulated amortization:
Client lists		(105,048	)		(97,063	)
Other intangible assets		(4,764	)		(4,143	)
Total accumulated amortization		(109,812	)		(101,206	)
Goodwill and other intangible assets, net	$	640,312		$	613,206

Depreciation and Amortization

6 Months Ended

Jun. 30, 2018

Text Block [Abstract]

Depreciation and Amortization

Note 6. Depreciation and Amortization

Depreciation and amortization expense for property and equipment and intangible assets for the three and six months ended June 30, 2018 and 2017 was as follows (in thousands):

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2018		2017		2018		2017
Operating expenses	$	5,825	$	5,546	$	11,507	$	11,089
Corporate general and administrative expenses		76		92		169		190
Total depreciation and amortization expense	$	5,901	$	5,638	$	11,676	$	11,279

Debt and Financing Arrangements

6 Months Ended

Jun. 30, 2018

Debt Disclosure [Abstract]

Debt and Financing Arrangements

Note 7. Debt and Financing Arrangements

On April 3, 2018, we amended and restated our $400 million unsecured credit facility (as so amended and restated, the “2018 credit facility”), by and among CBIZ Operations, Inc., CBIZ, Inc., and Bank of America, N.A., as administrative agent and bank, and other participating banks. The 2018 credit facility amends and restates our credit agreement (prior to being amended and restated by the 2018 credit facility, the “2014 credit facility”), dated as of July 28, 2014, as amended by the First Amendment to credit agreement, dated as of April 10, 2015, and as amended by the Second Amendment to credit agreement, as filed on November 3, 2015.

The 2018 credit facility extends the maturity date from 2019 to 2023, and continues to provide for a $400 million revolving loan commitment. The 2018 credit facility improves our borrowing margin related to leverage ratio and increases the flexibility of certain covenant baskets, as compared to the 2014 credit facility. In connection with our 2018 credit facility, we incurred approximately $1.1 million of financing costs during the second quarter of 2018, which have been deferred as other assets on our Consolidated Balance Sheets. These deferred financing costs are being amortized as interest expense on a straight line basis over the term of 2018 credit facility.

The 2018 credit facility provides us with the capital necessary to meet our working capital needs as well as the flexibility to continue with our strategic initiatives, including business acquisitions and share repurchases. In addition to the discussion below, refer to our Annual Report on Form 10-K for the year ended December 31, 2017 for additional details of our debt and financing arrangements.

Bank Debt

The balance outstanding under the 2018 credit facility and the 2014 credit facility was $180.2 million and $178.5 million at June 30, 2018 and December 31, 2017, respectively.

Rates for the three months ended June 30, 2018 and 2017 were as follows:

We have approximately $200 million of available funds under the 2018 credit facility at June 30, 2018, net of outstanding letters of credit of $0.9 million. As of June 30, 2018, we were in compliance with our debt covenants.

Interest Expense

During the three months ended June 30, 2018 and 2017, interest expense under the 2018 credit facility and the 2014 credit facility was $1.8 million and $1.7 million, respectively. During the six months ended June 30, 2018 and 2017, interest expense under the 2018 credit facility and 2014 credit facility was $3.6 million and $3.2 million, respectively.

Commitments and Contingencies	6 Months Ended
Commitments and Contingencies	Jun. 30, 2018
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	Note 8. Commitments and Contingencies Letters of Credit and Guarantees We provide letters of credit to landlords (lessors) of our leased premises in lieu of cash security deposits, which totaled $0.9 million and $2.3 million at June 30, 2018 and December 31, 2017, respectively. In addition, we provide license bonds to various state agencies to meet certain licensing requirements. The amount of license bonds outstanding was $2.9 million and $2.5 million at June 30, 2018 and December 31, 2017, respectively. Legal Proceedings In 2010, CBIZ, Inc. and its subsidiary, CBIZ MHM, LLC (fka CBIZ Accounting, Tax & Advisory Services, LLC) (the “CBIZ Parties”), were named as defendants in lawsuits filed in the U.S. District Court for the District of Arizona and the Superior Court for Maricopa County, Arizona. The federal court case is captioned Robert Facciola, et al v. Greenberg Traurig LLP, et al, and the state court cases are captioned Victims Recovery, LLC v. Greenberg Traurig LLP, et al, Roger Ashkenazi, et al v. Greenberg Traurig LLP, et al, Mary Marsh, et al v. Greenberg Traurig LLP, et al; and ML Liquidating Trust v. Mayer Hoffman McCann, P.C. (“Mayer Hoffman”), et al. Prior to these suits CBIZ MHM, LLC was named as a defendant in Jeffrey C. Stone v. Greenberg Traurig LLP, et al. These lawsuits arose out of the bankruptcy of Mortgages Ltd., a mortgage lender to developers in the Phoenix, Arizona area. Various other professional firms and individuals not related to the Company were also named defendants in these lawsuits. The lawsuits asserted claims for, among others things, violations of the Arizona Securities Act, common law fraud, and negligent misrepresentation, and sought to hold the CBIZ Parties vicariously liable for Mayer Hoffman’s conduct as Mortgage Ltd.’s auditor, as either a statutory control person under the Arizona Securities Act or a joint venturer under Arizona common law. With the exception of claims being pursued by two plaintiffs from the Ashkenazi lawsuit (“Baldino Group”), all other related matters have been dismissed or settled without payment by the CBIZ Parties. The Baldino Group’s claims, which allege damages of approximately $16 million, are currently stayed as to the CBIZ Parties and Mayer Hoffman, and no trial date has been set. On September 16, 2016, CBIZ, Inc. and its subsidiary CBIZ Benefits & Insurance Services, Inc. (“CBIZ Benefits”) were named as defendants in a lawsuit filed in the U.S. District Court for the Western District of Pennsylvania. The federal court case is brought by UPMC, d/b/a University of Pittsburgh Medical Center, and a health system it acquired, UPMC Altoona (formerly, Altoona Regional Health System). The lawsuit asserts professional negligence, breach of contract, and negligent misrepresentation claims against CBIZ, CBIZ Benefits and a former employee of CBIZ Benefits in connection with actuarial services provided by CBIZ Benefits to Altoona Regional Health System. The complaint seeks damages in an amount of no less than $142 million. We cannot predict the outcome of the above matters or estimate the possible loss or range of possible loss, if any. Although the proceedings are subject to uncertainties inherent in the litigation process and the ultimate disposition of these proceedings is not presently determinable, we intend to vigorously defend these cases. In addition to those items disclosed above, we are, from time to time, subject to claims and suits arising in the ordinary course of business.

Financial Instruments

6 Months Ended

Jun. 30, 2018

Investments All Other Investments [Abstract]

Financial Instruments

Note 9. Financial Instruments

Bonds

We held corporate and municipal bonds with par values totaling $52.6 million and $49.5 million at June 30, 2018 and December 31, 2017, respectively. All bonds are investment grade and are classified as available-for-sale. These bonds have maturity or callable dates ranging from July 2018 through November 2023, and are included in “Funds held for clients – current” in the accompanying Consolidated Balance Sheets based on our intent and ability to sell these investments at any time under favorable conditions. The following table summarizes our bond activity for the six months ended June 30, 2018 and the twelve months ended December 31, 2017 (in thousands):

	Six Months Ended			Twelve Months Ended
	June 30, 2018			December 31, 2017
Fair value at beginning of period	$	51,101		$	44,573
Purchases		10,345			15,546
Redemptions		(1,098	)		(940	)
Maturities		(6,175	)		(7,845	)
Decrease in bond premium		(48	)		(160	)
Fair market value adjustment		(451	)		(73	)
Fair value at end of period	$	53,674		$	51,101

Interest Rate Swaps

We do not purchase or hold any derivative instruments for trading or speculative purposes. We utilize interest rate swaps to manage interest rate risk exposure associated with our floating-rate debt under the credit facility. Under these interest rate swap contracts, we receive cash flows from counterparties at variable rates based on the London Interbank Offered Rate (“LIBOR”) and pay the counterparties a fixed rate. See our Annual Report on Form 10-K for the year ended December 31, 2017 for further discussion on our interest rate swaps.

During the second quarter of 2018, we entered into an additional interest rate swap with a notional value of $15 million at a fixed interest rate of 2.64% maturing in 5 years.

The following table summarizes our outstanding interest rate swaps and their classification in the accompanying Consolidated Balance Sheets at June 30, 2018 and December 31, 2017 (in thousands):

	June 30, 2018
	Notional		Fair
	Amount		Value		Balance Sheet Location
Interest rate swaps	$	70,000	$	1,892	Other non-current assets
Interest rate swaps	$	15,000	$	58	Other current assets

	December 31, 2017
	Notional		Fair
	Amount		Value		Balance Sheet Location
Interest rate swaps	$	55,000	$	1,055	Other non-current assets
Interest rate swaps	$	15,000	$	76	Other current assets

Under the terms of the interest rate swaps, we pay interest at a fixed rate of interest plus applicable margin as stated in the agreement, and receive interest that varies with the one-month LIBOR. The notional value, fixed rate of interest and expiration date of each interest rate swap as of June 30, 2018 is (i) $15 million – 1.155%, (ii) $25 million – 1.300% - October 2020, (iii) $10 million – 1.120% - February 2021, (iv) $20 million – 1.770% - May 2022, and (v) $15 million – 2.64% - June 2023. Refer to Note 10, Fair Value Measurements, for additional disclosures regarding fair value measurements.

The following table summarizes the effects of the interest rate swaps on the accompanying Consolidated Statements of Comprehensive Income for the three and six months ended June 30, 2018 and 2017 (in thousands):

	Gain (Loss) Recognized in AOCL, net of tax					(Loss) Gain Reclassified from AOCL into Expense
	Three Months Ended					Three Months Ended
	June 30,					June 30,
	2018		2017			2018			2017
Interest rate swap	$	176	$	(22	)	$	(87	)	$	42

	Six Months Ended				Six Months Ended
	June 30,				June 30,
	2018		2017		2018			2017
Interest rate swap	$	626	$	71	$	(125	)	$	100

Fair Value Measurements

6 Months Ended

Jun. 30, 2018

Fair Value Disclosures [Abstract]

Fair Value Measurements

Note 10. Fair Value Measurements

The following table summarizes our assets and liabilities at June 30, 2018 and December 31, 2017, respectively, that are measured at fair value on a recurring basis subsequent to initial recognition and indicates the fair value hierarchy of the valuation techniques utilized by us to determine such fair value (in thousands):

	Level	June 30, 2018			December 31, 2017
Deferred compensation plan assets	1	$	89,987		$	85,589
Corporate and municipal bonds	1	$	53,674		$	51,101
Deferred compensation plan liabilities	1	$	(89,987	)	$	(85,589	)
Interest rate swaps	2	$	1,950		$	1,131
Contingent purchase price liabilities	3	$	(46,528	)	$	(37,574	)

During the six months ended June 30, 2018 and 2017, there were no transfers between the valuation hierarchy Levels 1, 2 and 3. The following table summarizes the change in Level 3 fair values of our contingent purchase price liabilities for the six months ended June 30, 2018 and 2017 (pre-tax basis) (in thousands):

	2018			2017
Beginning balance – January 1	$	(37,574	)	$	(33,709	)
Additions from business acquisitions		(12,361	)		(17,526	)
Settlement of contingent purchase price liabilities		6,457			7,253
Change in fair value of contingencies		(2,562	)		1,032
Change in net present value of contingencies		(488	)		(276	)
Ending balance – June 30	$	(46,528	)	$	(43,226	)

Contingent Purchase Price Liabilities

Contingent purchase price liabilities result from our business acquisitions and are recorded at fair value at the time of acquisition and are recorded in “Contingent purchase price liability — current” and “Contingent purchase price liability — non-current” in the accompanying Consolidated Balance Sheets. We estimate the fair value of our contingent purchase price liabilities using a probability-weighted discounted cash flow model. This fair value measure is based on significant inputs not observed in the market and thus represents a Level 3 measurement. Fair value measurements characterized within Level 3 of the fair value hierarchy are measured based on unobservable inputs that are supported by little or no market activity and reflect our own assumptions in measuring fair value.

We probability weight risk-adjusted estimates of future performance of acquired businesses, then calculate the contingent purchase price based on the estimates and discount them to present value representing management’s best estimate of fair value. The fair value of the contingent purchase price liabilities are reassessed on a quarterly basis based on assumptions provided by practice group leaders and business unit controllers together with our corporate finance department. Any change in the fair value estimate is recorded in the earnings of that period. Refer to Note 14, Acquisitions, for further discussion of our acquisitions and contingent purchase price liabilities.

The carrying amounts of our cash and cash equivalents, accounts receivable and accounts payable approximate fair value because of the short maturity of these instruments, and the carrying value of bank debt approximates fair value as the interest rate on the bank debt is variable and approximates current market rates. As a result, the fair value measurement of our bank debt is considered to be Level 2.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Other Comprehensive Income

6 Months Ended

Jun. 30, 2018

Equity [Abstract]

Other Comprehensive Income

Note 11. Other Comprehensive Income

The following table is a summary of other comprehensive income and discloses the tax impact of each component of other comprehensive income for the three and six months ended June 30, 2018 and 2017 (in thousands):

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2018			2017			2018			2017
Net unrealized gain (loss) on available-for-sale securities, net of income taxes (1)	$	4		$	62		$	(326	)	$	151
Net unrealized gain (loss) on interest rate swaps, net of income taxes (2)		176			(22	)		626			71
Foreign currency translation		(6	)		(3	)		(12	)		(5	)
Total other comprehensive income	$	174		$	37		$	288		$	217

(1)

Net of income tax expense of $1 and $41 for the three months ended June 30, 2018 and 2017, respectively, and net of income tax (benefit) expense of ($121) and $100 for the six months ended June 30, 2018 and 2017, respectively.

(2)

Net of income tax expense (benefit) of $54 and ($13) for the three months ended June 30, 2018 and 2017, respectively, and net of income tax expense of $193 and $42 for the six months ended June 30, 2018 and 2017, respectively.

Accumulated other comprehensive income (loss), net of tax, was approximately $0.1 million and ($0.2) million for the period ending June 30, 2018 and December 31, 2017, respectively. Accumulated other comprehensive income (loss) consisted of adjustments, net of tax, for unrealized gains and losses on available-for-sale securities and interest rate swaps, and foreign currency translation.

Employee Share Plans

6 Months Ended

Jun. 30, 2018

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Employee Share Plans

Note 12. Employee Share Plans

We grant various share-based awards under the CBIZ, Inc. 2014 Stock Incentive Plan (the “2014 Plan”), which expires in 2024. The terms and vesting schedules for the share-based awards vary by type and date of grant. A maximum of 9.6 million stock options, shares of restricted stock or other stock-based compensation awards may be granted. Shares subject to award under the 2014 Plan may be either authorized but unissued shares of CBIZ common stock or treasury shares. Compensation expense for stock-based awards recognized during the three and six months ended June 30, 2018 and 2017 was as follows (in thousands):

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2018		2017		2018		2017
Stock options	$	1,030	$	524	$	1,548	$	1,050
Restricted stock awards		1,383		891		2,302		1,740
Total stock-based compensation expense	$	2,413	$	1,415	$	3,850	$	2,790

Stock award activity during the six months ended June 30, 2018 was as follows (in thousands, except per share data):

	Stock Options					Restricted Stock Awards
	Number of Options			Weighted Average Exercise Price Per Share		Number of Shares			Weighted Average Grant-Date Fair Value (1)
Outstanding at beginning of year		3,844		$	9.67		724		$	11.78
Granted		642		$	19.45		272		$	18.77
Exercised or released		(616	)	$	7.19		(362	)	$	11.19
Expired or canceled		—		$	—		—		$	—
Outstanding at June 30, 2018		3,870		$	11.69		634		$	15.33
Exercisable at June 30, 2018		2,254		$	9.03

(1)

Represents weighted average market value of the shares; awards are granted at no cost to the recipients.

We utilized the Black-Scholes-Merton options-pricing model to determine the fair value of stock options on the date of grant. The fair value of stock options granted during the second quarter of 2018 was $4.73. The following weighted average assumptions were utilized:

	Six Months Ended June 30,
Expected volatility (1)		22.04	%
Expected option life (years) (2)		4.62
Risk-free interest rate (3)		2.80	%
Expected dividend yield (4)		0.00	%

(1)

The expected volatility assumption was determined based upon the historical volatility of our stock price, using daily price intervals.

(2)

The expected option life was determined based upon our historical data using a midpoint scenario, which assumes all options are exercised halfway between the expiration date and the weighted average time for the option to vest.

(3)

The risk-free interest rate assumption was based upon zero-coupon U.S. Treasury bonds with a term approximating the expected life of the respective options.

(4)

The expected dividend yield assumption was determined in view of our historical and estimated dividend payouts. We do not expect to change our dividend payout policy in the foreseeable future.

Earnings Per Share

6 Months Ended

Jun. 30, 2018

Earnings Per Share [Abstract]

Earnings Per Share

Note 13. Earnings Per Share

The following table sets forth the computation of basic and diluted earnings per share from continuing operations for the three and six months ended June 30, 2018 and 2017 (in thousands, except per share data).

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2018		2017		2018		2017
Numerator:
Income from continuing operations	$	13,121	$	11,416	$	48,931	$	36,442
Denominator:
Basic
Weighted average common shares outstanding		54,594		53,968		54,334		53,632
Diluted
Stock options (1)		1,550		1,544		1,500		1,524
Restricted stock awards (1)		290		319		329		374
Contingent shares (2)		3		—		3		—
Diluted weighted average common shares outstanding		56,437		55,831		56,166		55,530
Basic earnings per share from continuing operations	$	0.24	$	0.21	$	0.90	$	0.68
Diluted earnings per share from continuing operations	$	0.23	$	0.20	$	0.87	$	0.66

(1)

A total of 0.4 million and 0.7 million share based awards were excluded from the calculation of diluted earnings per share for the three and six months ended June 30, 2018, respectively, and a total of 0.5 million and 0.2 million share based awards were excluded from the calculation of diluted earnings per share for the three and six months ended June 30, 2017, respectively, as their effect would be anti-dilutive.

(2)

Contingent shares represent additional shares to be issued for purchase price earned by former owners of businesses acquired by us once future considerations have been met. Refer to Note 14, Acquisitions, for further details.

Acquisitions

6 Months Ended

Jun. 30, 2018

Business Combinations [Abstract]

Acquisitions

Note 14. Acquisitions

Our acquisition strategy focuses on businesses with a leadership team that is committed to best in class culture, extraordinary client service and cross-serving potential. CBIZ has a long history of acquiring businesses that share common cultural values with us and provide value-added services to the small and midsize business market. The valuation of any business is a subjective process and includes industry, geography, profit margins, expected cash flows, client retention, nature of recurring or non-recurring project-based work, growth rate assumptions and competitive market conditions.

2018

During the first half of 2018, we acquired substantially all of the assets of two businesses; InR Advisory Services, LLC (“InR”), effective April 1, 2018, and Laurus Transaction Advisors, LLC (“Laurus”), effective February 1, 2018. InR, located in Media, Pennsylvania, provides investment advisory services for public and private sector clients and non-profit organizations. Operating results of InR are reported in the Benefits and Insurance Services practice group. Laurus, located in Denver, Colorado, provides financial and accounting due diligence and advisory services with respect to mergers and acquisition transactions to private equity groups and public and private sector companies. Operating results for Laurus are reported in the Financial Services practice group.

Aggregate consideration for the InR and Laurus acquisitions consisted of approximately $23.4 million in cash consideration, $0.9 million in CBIZ common stock and $12.4 million in contingent consideration. Under the terms of these acquisition agreements, a portion of the purchase price is contingent on future performance of the business acquired. The maximum potential undiscounted amount of all future payments that we could be required to make under the contingent arrangements is $12.4 million, of which $3.4 million was recorded in “Contingent purchase price liability – current” and $9 million was recorded in “Contingent purchase price liability – non-current” in the accompanying Consolidated Balance Sheets at June 30, 2018. Refer to Note 10, Fair Value Measurements, for additional information regarding contingent purchase price liability fair value and fair value adjustments.

Annualized revenue for these acquisitions is estimated to be approximately $9.1 million. Pro forma results of operations for these acquisitions have not been presented because the effects of the acquisitions were not significant to our “Income from continuing operations before income taxes.”

2017

During the first half of 2017, we acquired substantially all of the assets of three businesses; CMF Associates, LLC (“CMF”), effective June 1, 2017, Slaton Insurance (“Slaton”), effective June 1, 2017, and Pacific Coastal Pension and Insurance Services, Inc. (“Pacific Coastal”), effective February 1, 2017. CMF, located in Philadelphia, provides various financial consulting, executive search and deal origination services. Operating results of CMF are reported in the Financial Services practice group. Slaton, located in West Palm Beach, Florida, is a full service insurance brokerage firm offering clients a complete line of services including commercial lines, risk management and employee benefits. Pacific Coastal, located in Morgan Hill, California, provides defined contribution third party administrative and consulting services. Operating results for both Slaton and Pacific Coastal are reported in the Benefits and Insurance Services practice group.

Aggregate consideration for these acquisitions consisted of approximately $23.7 million in cash consideration, $2 million in CBIZ common stock and $17.5 million in contingent consideration. The maximum potential undiscounted amount of all future payments that we could be required to make under the contingent arrangements is $17.5 million, of which $5.9 million was recorded in “Contingent purchase price liability – current” and $11.6 million was recorded in “Contingent purchase price liability – non-current” in the accompanying Consolidated Balance Sheets at June 30, 2017.

Annualized revenue for these acquisitions is estimated to be approximately $23.2 million. Pro forma results of operations for these acquisitions have not been presented because the effects of the acquisitions were not significant to our “Income from continuing operations before income taxes.”

The following table summarizes the amounts of identifiable assets acquired, liabilities assumed and aggregate purchase price for the acquisitions for the six months ended June 30, 2018 and 2017 (in thousands):

	Six Months Ended
	June 30,
	2018			2017
Cash	$	306		$	843
Accounts receivable, net		1,920			4,338
Property and equipment, net	$	—		$	24
Other assets		12			151
Identifiable intangible assets		3,864			3,115
Current liabilities		(1,717	)		(4,716	)
Total identifiable net assets	$	4,385		$	3,755
Goodwill		32,255			39,460
Aggregate purchase price	$	36,640		$	43,215

The goodwill of $32.3 million and $39.5 million arising from the acquisitions in the first half of 2018 and 2017, respectively, primarily results from expected future earnings and cash flows from the existing management team, as well as the synergies created by the integration of the new business within our organization, including cross-selling opportunities expected with our Financial Services practice group and the Benefits and Insurance Services practice group, to help strengthen our existing service offerings and expand our market position. All of the goodwill is deductible for income tax purposes.

Client Lists

During the six months ended June 30, 2018, we did not purchase any client lists. During the same period in 2017, we purchased one client list which is reported in the Benefits and Insurance Services practice group for $0.7 million of contingent consideration.

Change in Contingent Purchase Price Liability for Previous Acquisitions

During the first half of 2018 and 2017, the fair value of the contingent purchase price liability related to prior acquisitions increased by $3.1 million and $0.8 million, respectively. The change in fair value during the first half of 2018 is mostly attributable to the change in stock price related to the mark-to-market adjustment of future common stock issuances, while the change in fair value for the first half of 2017 is due to the subsequent measurement adjustment based on projected future results of the acquired businesses. These adjustments are included in “Other income (expense), net” in the accompanying Consolidated Statements of Comprehensive Income.

Contingent Payments for Previous Acquisitions and Client Lists

We paid $4.1 million in cash and issued approximately 56,000 shares of our common stock during the six months ended June 30, 2018 for previous acquisitions. For the same period in 2017, we paid $4.8 million in cash and issued approximately 177,000 shares of our common for previous acquisitions. For the first half of 2018 and 2017, we paid approximately $0.6 million and $0.7 million in cash for previous client list purchases.

Discontinued Operations and Divestitures	6 Months Ended
Discontinued Operations and Divestitures	Jun. 30, 2018
Discontinued Operations And Disposal Groups [Abstract]
Discontinued Operations and Divestitures	Note 15. Discontinued Operations and Divestitures We will divest (through sale or closure) business operations that do not contribute to our long-term objectives for growth, or that are not complementary to our target service offerings and markets. Discontinued Operations Discontinued operations primarily consist of two small businesses under the Financial Services segment that were sold in 2015. During the first half of both 2018 and 2017, we did not discontinue the operations of any of our businesses. Divestitures Divested operations and assets that do not qualify for treatment as discontinued operations are recorded as “Gain on sale of operations, net” in the accompanying Consolidated Statements of Comprehensive Income. We recorded a gain of $0.7 million in the first half of 2018, related to a small book of business under the Benefits and Insurance Services practice group.

Segment Disclosures

6 Months Ended

Jun. 30, 2018

Segment Reporting [Abstract]

Segment Disclosures

Note 16. Segment Disclosures

Our business units have been aggregated into three practice groups: Financial Services, Benefits and Insurance Services and National Practices. The business units have been aggregated based on the following factors: similarity of the products and services provided to clients; similarity of the regulatory environment in which they operate; and similarity of economic conditions affecting long-term performance. The business units are managed along these segment lines. A general description of services provided by each practice group is provided in the table below.

Financial Services

Benefits and Insurance Services

National Practices

• Accounting and Tax

• Government Healthcare Consulting

• Financial Advisory

• Valuation

• Risk & Advisory Services

• Group Health Benefits Consulting

• Payroll

• Property & Casualty

• Retirement Plan Services

• Managed Networking and Hardware Services

• Healthcare Consulting

Corporate and Other. Included in “Corporate and Other” are operating expenses that are not directly allocated to the individual business units. These expenses are primarily comprised of certain health care costs, gains or losses attributable to assets held in our non-qualified deferred compensation plan, share-based compensation, consolidation and integration charges, certain professional fees, certain advertising costs and other various expenses.

Accounting policies of the practice groups are the same as those described in Note 1, Basis of Presentation and Significant Accounting Policies, to the Annual Report on Form 10-K for the year ended December 31, 2017. Upon consolidation, intercompany accounts and transactions are eliminated, thus inter-segment revenue is not included in the measure of profit or loss for the practice groups. Performance of the practice groups is evaluated on operating income excluding those costs listed above, which are reported in the “Corporate and Other” segment.

Segment information for the three and six months ended June 30, 2018 and 2017 is presented below. We do not manage our assets on a segment basis, therefore segment assets are not presented below.

	Three Months Ended June 30, 2018
	Financial Services			Benefits and Insurance Services			National Practices		Corporate and Other			Total
Revenue	$	151,737		$	72,753		$	8,151	$	—		$	232,641
Operating expenses		129,070			61,165			7,567		7,300			205,102
Gross margin		22,667			11,588			584		(7,300	)		27,539
Corporate general & admin		—			—			—		9,993			9,993
Operating income (loss)		22,667			11,588			584		(17,293	)		17,546
Other (expense) income:
Interest expense		—			(15	)		—		(1,802	)		(1,817	)
Other (expense) income, net		(17	)		30			—		617			630
Total other (expense) income		(17	)		15			—		(1,185	)		(1,187	)
Income (loss) from continuing operations before income tax expense	$	22,650		$	11,603		$	584	$	(18,478	)	$	16,359

	Three Months Ended June 30, 2017
	Financial Services		Benefits and Insurance Services			National Practices			Corporate and Other			Total
Revenue	$	132,591	$	70,559		$	7,866		$	—		$	211,016
Operating expenses		115,851		59,877			7,235			5,157			188,120
Gross margin		16,740		10,682			631			(5,157	)		22,896
Corporate general & admin		—		—			—			9,232			9,232
Operating income (loss)		16,740		10,682			631			(14,389	)		13,664
Other income (expense):
Interest expense		—		(9	)		—			(1,683	)		(1,692	)
Gain on sale of operations, net		—		—			—			23			23
Other income (expense), net		28		120			(9	)		3,625			3,764
Total other income (expense)		28		111			(9	)		1,965			2,095
Income (loss) from continuing operations before income tax expense	$	16,768	$	10,793		$	622		$	(12,424	)	$	15,759

Segment information for the six months ended June 30, 2018 and 2017 was as follows (in thousands):

	Six Months Ended June 30, 2018
	Financial Services		Benefits and Insurance Services			National Practices		Corporate and Other			Total
Revenue	$	332,340	$	150,083		$	16,308	$	—		$	498,731
Operating expenses		262,103		122,298			14,842		10,609			409,852
Gross margin		70,237		27,785			1,466		(10,609	)		88,879
Corporate general & admin		—		—			—		20,021			20,021
Operating income (loss)		70,237		27,785			1,466		(30,630	)		68,858
Other income (expense):
Interest expense		—		(89	)		—		(3,508	)		(3,597	)
Gain on sale of operations, net		—		—			—		663			663
Other income (expense), net		248		222			—		(1,069	)		(599	)
Total other income (expense)		248		133			—		(3,914	)		(3,533	)
Income (loss) from continuing operations before income tax expense	$	70,485	$	27,918		$	1,466	$	(34,544	)	$	65,325

	Six Months Ended June 30, 2017
	Financial Services		Benefits and Insurance Services			National Practices			Corporate and Other			Total
Revenue	$	291,224	$	145,723		$	15,528		$	—		$	452,475
Operating expenses		235,240		120,019			14,242			11,385			380,886
Gross margin		55,984		25,704			1,286			(11,385	)		71,589
Corporate general & admin		—		—			—			18,000			18,000
Operating income (loss)		55,984		25,704			1,286			(29,385	)		53,589
Other income (expense):
Interest expense		—		(20	)		—			(3,189	)		(3,209	)
Gain on sale of operations, net		—		—			—			45			45
Other income (expense), net		43		216			(9	)		6,251			6,501
Total other income (expense)		43		196			(9	)		3,107			3,337
Income (loss) from continuing operations before income tax expense	$	56,027	$	25,900		$	1,277		$	(26,278	)	$	56,926

Subsequent Events	6 Months Ended
Subsequent Events	Jun. 30, 2018
Subsequent Events [Abstract]
Subsequent Events	Note 17. Subsequent Events Subsequent to June 30, 2018 and through July 31, 2018, we repurchased approximately 0.1 million shares in the open market at a total cost of $1.2 million under our current Rule 10b5-1 trading plan, which allows us to repurchase shares below a predetermined price per share.

Summary of Significant Accounting Policies (Policies)

6 Months Ended

Jun. 30, 2018

Accounting Policies [Abstract]

Description of Business

Description of Business: CBIZ, Inc. is a diversified services company which, acting through its subsidiaries, has been providing professional business services since 1996, primarily to small and medium-sized businesses, as well as individuals, governmental entities, and not-for-profit enterprises throughout the United States and parts of Canada. CBIZ, Inc. manages and reports its operations along three practice groups; Financial Services, Benefits and Insurance Services and National Practices. A further description of products and services offered by each of the practice groups is provided in Note 16, Segment Disclosures, to the accompanying consolidated financial statements.

Basis of Consolidation

Basis of Consolidation: The accompanying unaudited condensed consolidated financial statements include the operations of CBIZ, Inc. and all of its wholly-owned subsidiaries (“CBIZ”, the “Company”, “we”, “us”, or “our”), after elimination of all intercompany balances and transactions. These condensed consolidated financial statements do not reflect the operations or accounts of variable interest entities as the impact is not material to the financial condition, results of operations or cash flows of CBIZ.

Unaudited Interim Financial Statements

Unaudited Interim Financial Statements: The condensed consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States (“GAAP”) and applicable rules and regulations of the Securities and Exchange Commission (the “SEC”) regarding interim financial reporting. Certain information and note disclosures normally included in the financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations. As such, the information included in this quarterly report on Form 10-Q should be read in conjunction with the consolidated financial statements and accompanying notes included in our Annual Report on Form 10-K for the fiscal year ended December 31, 2017.

In the opinion of CBIZ management, the accompanying condensed consolidated financial statements reflect all normal recurring adjustments necessary to present fairly the financial condition, results of operations, and cash flows for the interim periods presented, but are not necessarily indicative of the results of operations to be anticipated for the full year ending December 31, 2018.

Use Of Estimates

Use of Estimates: The preparation of condensed consolidated financial statements in conformity with GAAP requires us to make estimates and assumptions that affect the amounts reported and disclosed in the financial statements and the accompanying notes. Changes in circumstances could cause actual results to differ materially from these estimates.

Changes in Accounting Policies

Changes in Accounting Policies: We have consistently applied the accounting policies for the periods presented as described in Note 1, Basis of Presentation and Significant Accounting Policies, to the consolidated financial statements contained in our Annual Report on Form 10-K for the fiscal year ended December 31, 2017. Effective January 1, 2018, we adopted Accounting Standards Update (“ASU”) No. 2015-14, “Revenue from Contracts with Customers” (“Topic 606”). As a result, we have changed our accounting policy for revenue recognition as described below in Note 2, New Accounting Pronouncements.

New Accounting Pronouncements

Accounting Standards Adopted in 2018

	June 30		June 30
	2018		2017
Cash and cash equivalents	$	1,921	$	1,161
Restricted cash		39,535		34,924
Total cash, cash equivalents and restricted cash	$	41,456	$	36,085

•

The cumulative effect of the changes made to our consolidated January 1, 2018 balance sheet was as follows (in thousands):

	Balance at		Adjustments		Balance at
	December 31,		due to		January 1,
Balance Sheet	2017		Topic 606		2018
ASSETS
Accounts receivable, net	$	188,300	$	9,446	$	197,746
Other current assets		259,873		80		259,953
Other non-current assets		728,058		728		728,786
Total assets	$	1,176,231	$	10,254	$	1,186,485
LIABILITIES
Accounts payable		51,375		6,281		57,656
Accrued personnel costs		45,264		595		45,859
Other current liabilities		237,607		113		237,720
Deferred income taxes, net		3,339		631		3,970
Other non-current liabilities		307,767		1,012		308,779
Total liabilities		645,352		8,632		653,984
STOCKHOLDERS' EQUITY
Retained earnings		345,302		1,622		346,924
Other stockholders' equity		185,577		—		185,577
Total stockholders' equity		530,879		1,622		532,501
Total liabilities and stockholders' equity	$	1,176,231	$	10,254	$	1,186,485

The following tables summarize the impact of adopting Topic 606 on our consolidated financial statements for the periods indicated below (in thousands):

						Balances without
Second Quarter 2018 Balance Sheet	As reported		Adjustments			adoption of Topic 606
ASSETS
Accounts receivable, net	$	245,639	$	(11,886	)	$	233,753
Other current assets		200,633		(80	)		200,553
Other non-current assets		763,852		(687	)		763,165
Total assets	$	1,210,124	$	(12,653	)	$	1,197,471
LIABILITIES
Accounts payable	$	80,823	$	(7,799	)	$	73,024
Accrued personnel costs		42,750		(582	)		42,168
Other current liabilities		181,839		(114	)		181,725
Deferred income taxes, net		4,000		(870	)		3,130
Other non-current liabilities		311,886		(953	)		310,933
Total liabilities		621,298		(10,318	)		610,980
STOCKHOLDERS' EQUITY
Retained earnings		395,881		(2,335	)		393,546
Other stockholders' equity		192,945		—			192,945
Total shareholders' equity		588,826		(2,335	)		586,491
Total liabilities and stockholders' equity	$	1,210,124	$	(12,653	)	$	1,197,471

							Balances without
Three Months Ended June 30, 2018 Income Statement	As reported			Adjustments			adoption of Topic 606
Revenue	$	232,641		$	(483	)	$	232,158
Operating expenses		205,102			44			205,146
Gross margin		27,539			(527	)		27,012
Corporate general and administrative expenses		9,993			—			9,993
Operating income		17,546			(527	)		17,019
Other (expense) income:
Interest expense		(1,817	)		—			(1,817	)
Gain on sale of operations, net		—			—			—
Other income, net		630			—			630
Total other expense, net		(1,187	)		—			(1,187	)
Income from continuing operations before income tax expense		16,359			(527	)		15,832
Income tax expense		3,238			(125	)		3,113
Income from continuing operations		13,121			(402	)		12,719
Loss from discontinued operations, net of tax		(15	)		—			(15	)
Net income	$	13,106		$	(402	)	$	12,704

							Balances without
Six Months Ended June 30, 2018 Income Statement	As reported			Adjustments			adoption of Topic 606
Revenue	$	498,731		$	(981	)	$	497,750
Operating expenses		409,852			(29	)		409,823
Gross margin		88,879			(952	)		87,927
Corporate general and administrative expenses		20,021			—			20,021
Operating income		68,858			(952	)		67,906
Other (expense) income:
Interest expense		(3,597	)		—			(3,597	)
Gain on sale of operations, net		663			—			663
Other expense, net		(599	)		—			(599	)
Total other expense, net		(3,533	)		—			(3,533	)
Income from continuing operations before income tax expense		65,325			(952	)		64,373
Income tax expense		16,394			(239	)		16,155
Income from continuing operations		48,931			(713	)		48,218
Gain from discontinued operations, net of tax		26			—			26
Net income	$	48,957		$	(713	)	$	48,244

							Balances without
Six Months Ended June 30, 2018 Cash Flow Statement	As reported			Adjustments			adoption of Topic 606
Cash flows from operating activities:
Net income	$	48,957		$	(713	)	$	48,244
Adjustments to reconcile net income to net cash provided by operating activities:		18,908			—			18,908
Changes in assets and liabilities, net of acquisitions and divestitures:								—
Accounts receivable, net		(44,774	)		2,440			(42,334	)
Other assets		(4,955	)		(41	)		(4,996	)
Accounts payable		18,796			(1,518	)		17,278
Accrued personnel costs		(3,302	)		13			(3,289	)
Other liabilities		(2,617	)		(181	)		(2,798	)
Other		10,245			—			10,245
Operating cash flows provide by continuing operations		41,258			—			41,258
Operating cash flows used in discontinued operations		(152	)		—			(152	)
Net cash provided by operating activities		41,106			—			41,106
Net provided by investing activities		42,471			—			42,471
Net cash used in financing activities		(75,530	)		—			(75,530	)
Net increase in cash, cash equivalents and restricted cash		8,047			—			8,047
Cash, cash equivalents and restricted cash at beginning of year		33,409			—			33,409
Cash, cash equivalents and restricted cash at end of period	$	41,456			—		$	41,456

Accounting Standards Not Yet Adopted

New Accounting Pronouncements (Tables)

6 Months Ended

Jun. 30, 2018

Accounting Changes And Error Corrections [Abstract]

Schedule of Reconciliation of Cash, Cash Equivalents and Restricted Cash Reported Accompanying Consolidated Balance Sheets

	June 30		June 30
	2018		2017
Cash and cash equivalents	$	1,921	$	1,161
Restricted cash		39,535		34,924
Total cash, cash equivalents and restricted cash	$	41,456	$	36,085

Summary of Impact of Adopting New Accounting Standards on Consolidated Financial Statements

The cumulative effect of the changes made to our consolidated January 1, 2018 balance sheet was as follows (in thousands):

	Balance at		Adjustments		Balance at
	December 31,		due to		January 1,
Balance Sheet	2017		Topic 606		2018
ASSETS
Accounts receivable, net	$	188,300	$	9,446	$	197,746
Other current assets		259,873		80		259,953
Other non-current assets		728,058		728		728,786
Total assets	$	1,176,231	$	10,254	$	1,186,485
LIABILITIES
Accounts payable		51,375		6,281		57,656
Accrued personnel costs		45,264		595		45,859
Other current liabilities		237,607		113		237,720
Deferred income taxes, net		3,339		631		3,970
Other non-current liabilities		307,767		1,012		308,779
Total liabilities		645,352		8,632		653,984
STOCKHOLDERS' EQUITY
Retained earnings		345,302		1,622		346,924
Other stockholders' equity		185,577		—		185,577
Total stockholders' equity		530,879		1,622		532,501
Total liabilities and stockholders' equity	$	1,176,231	$	10,254	$	1,186,485

The following tables summarize the impact of adopting Topic 606 on our consolidated financial statements for the periods indicated below (in thousands):

						Balances without
Second Quarter 2018 Balance Sheet	As reported		Adjustments			adoption of Topic 606
ASSETS
Accounts receivable, net	$	245,639	$	(11,886	)	$	233,753
Other current assets		200,633		(80	)		200,553
Other non-current assets		763,852		(687	)		763,165
Total assets	$	1,210,124	$	(12,653	)	$	1,197,471
LIABILITIES
Accounts payable	$	80,823	$	(7,799	)	$	73,024
Accrued personnel costs		42,750		(582	)		42,168
Other current liabilities		181,839		(114	)		181,725
Deferred income taxes, net		4,000		(870	)		3,130
Other non-current liabilities		311,886		(953	)		310,933
Total liabilities		621,298		(10,318	)		610,980
STOCKHOLDERS' EQUITY
Retained earnings		395,881		(2,335	)		393,546
Other stockholders' equity		192,945		—			192,945
Total shareholders' equity		588,826		(2,335	)		586,491
Total liabilities and stockholders' equity	$	1,210,124	$	(12,653	)	$	1,197,471

							Balances without
Three Months Ended June 30, 2018 Income Statement	As reported			Adjustments			adoption of Topic 606
Revenue	$	232,641		$	(483	)	$	232,158
Operating expenses		205,102			44			205,146
Gross margin		27,539			(527	)		27,012
Corporate general and administrative expenses		9,993			—			9,993
Operating income		17,546			(527	)		17,019
Other (expense) income:
Interest expense		(1,817	)		—			(1,817	)
Gain on sale of operations, net		—			—			—
Other income, net		630			—			630
Total other expense, net		(1,187	)		—			(1,187	)
Income from continuing operations before income tax expense		16,359			(527	)		15,832
Income tax expense		3,238			(125	)		3,113
Income from continuing operations		13,121			(402	)		12,719
Loss from discontinued operations, net of tax		(15	)		—			(15	)
Net income	$	13,106		$	(402	)	$	12,704

							Balances without
Six Months Ended June 30, 2018 Income Statement	As reported			Adjustments			adoption of Topic 606
Revenue	$	498,731		$	(981	)	$	497,750
Operating expenses		409,852			(29	)		409,823
Gross margin		88,879			(952	)		87,927
Corporate general and administrative expenses		20,021			—			20,021
Operating income		68,858			(952	)		67,906
Other (expense) income:
Interest expense		(3,597	)		—			(3,597	)
Gain on sale of operations, net		663			—			663
Other expense, net		(599	)		—			(599	)
Total other expense, net		(3,533	)		—			(3,533	)
Income from continuing operations before income tax expense		65,325			(952	)		64,373
Income tax expense		16,394			(239	)		16,155
Income from continuing operations		48,931			(713	)		48,218
Gain from discontinued operations, net of tax		26			—			26
Net income	$	48,957		$	(713	)	$	48,244

							Balances without
Six Months Ended June 30, 2018 Cash Flow Statement	As reported			Adjustments			adoption of Topic 606
Cash flows from operating activities:
Net income	$	48,957		$	(713	)	$	48,244
Adjustments to reconcile net income to net cash provided by operating activities:		18,908			—			18,908
Changes in assets and liabilities, net of acquisitions and divestitures:								—
Accounts receivable, net		(44,774	)		2,440			(42,334	)
Other assets		(4,955	)		(41	)		(4,996	)
Accounts payable		18,796			(1,518	)		17,278
Accrued personnel costs		(3,302	)		13			(3,289	)
Other liabilities		(2,617	)		(181	)		(2,798	)
Other		10,245			—			10,245
Operating cash flows provide by continuing operations		41,258			—			41,258
Operating cash flows used in discontinued operations		(152	)		—			(152	)
Net cash provided by operating activities		41,106			—			41,106
Net provided by investing activities		42,471			—			42,471
Net cash used in financing activities		(75,530	)		—			(75,530	)
Net increase in cash, cash equivalents and restricted cash		8,047			—			8,047
Cash, cash equivalents and restricted cash at beginning of year		33,409			—			33,409
Cash, cash equivalents and restricted cash at end of period	$	41,456			—		$	41,456

Revenue (Tables)

6 Months Ended

Jun. 30, 2018

Revenue Recognition [Abstract]

Summary of Disaggregation of Revenue by Source

In accordance with the new revenue recognition standard requirements, the following table disaggregates our revenue by source (in thousands):

	Three Months Ended June 30, 2018
	Financial		Benefits &		National
	Services		Insurance		Practices		Consolidated
Accounting, tax, advisory and consulting	$	151,737	$	—	$	—	$	151,737
Core Benefits and Insurance Services		—		68,978		—		68,978
Non-core Benefits and Insurance Services		—		3,775		—		3,775
Managed networking, hardware services		—		—		6,121		6,121
National Practices consulting		—		—		2,030		2,030
Total revenue	$	151,737	$	72,753	$	8,151	$	232,641

	Six Months Ended June 30, 2018
	Financial		Benefits &		National
	Services		Insurance		Practices		Consolidated
Accounting, tax, advisory and consulting	$	332,340	$	—	$	—	$	332,340
Core Benefits and Insurance Services		—		143,100		—		143,100
Non-core Benefits and Insurance Services		—		6,983		—		6,983
Managed networking, hardware services		—		—		12,079		12,079
National Practices consulting		—		—		3,999		3,999
Other		—		—		230		230
Total revenue	$	332,340	$	150,083	$	16,308	$	498,731

Accounts Receivable, Net (Tables)

6 Months Ended

Jun. 30, 2018

Receivables [Abstract]

Accounts Receivable, Net

Accounts receivable, net, at June 30, 2018 and December 31, 2017 were as follows (in thousands):

	June 30,			December 31,
	2018			2017
Trade accounts receivable	$	181,572		$	139,730
Unbilled revenue, at net realizable value		79,527			62,397
Total accounts receivable		261,099			202,127
Allowance for doubtful accounts		(15,460	)		(13,827	)
Accounts receivable, net	$	245,639		$	188,300

Goodwill and Other Intangible Assets, Net (Tables)

6 Months Ended

Jun. 30, 2018

Goodwill And Intangible Assets Disclosure [Abstract]

Components of Goodwill and Other Intangible Assets, Net

The components of goodwill and other intangible assets, net, at June 30, 2018 and December 31, 2017 were as follows (in thousands):

	June 30,			December 31,
	2018			2017
Goodwill	$	560,688		$	528,424
Intangible assets:
Client lists		180,070			177,221
Other intangible assets		9,366			8,767
Total intangible assets		189,436			185,988
Total goodwill and intangibles assets		750,124			714,412
Accumulated amortization:
Client lists		(105,048	)		(97,063	)
Other intangible assets		(4,764	)		(4,143	)
Total accumulated amortization		(109,812	)		(101,206	)
Goodwill and other intangible assets, net	$	640,312		$	613,206

Depreciation and Amortization (Tables)

6 Months Ended

Jun. 30, 2018

Text Block [Abstract]

Depreciation and Amortization Expense for Property and Equipment and Intangible Assets

Depreciation and amortization expense for property and equipment and intangible assets for the three and six months ended June 30, 2018 and 2017 was as follows (in thousands):

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2018		2017		2018		2017
Operating expenses	$	5,825	$	5,546	$	11,507	$	11,089
Corporate general and administrative expenses		76		92		169		190
Total depreciation and amortization expense	$	5,901	$	5,638	$	11,676	$	11,279

Debt and Financing Arrangements (Tables)

6 Months Ended

Jun. 30, 2018

Debt Disclosure [Abstract]

Summary of Unsecured Credit Facility

Rates for the three months ended June 30, 2018 and 2017 were as follows:

Financial Instruments (Tables)

6 Months Ended

Jun. 30, 2018

Investments All Other Investments [Abstract]

Summary of Bond Activity

The following table summarizes our bond activity for the six months ended June 30, 2018 and the twelve months ended December 31, 2017 (in thousands):

	Six Months Ended			Twelve Months Ended
	June 30, 2018			December 31, 2017
Fair value at beginning of period	$	51,101		$	44,573
Purchases		10,345			15,546
Redemptions		(1,098	)		(940	)
Maturities		(6,175	)		(7,845	)
Decrease in bond premium		(48	)		(160	)
Fair market value adjustment		(451	)		(73	)
Fair value at end of period	$	53,674		$	51,101

Summary of Outstanding Interest Rate Swaps

The following table summarizes our outstanding interest rate swaps and their classification in the accompanying Consolidated Balance Sheets at June 30, 2018 and December 31, 2017 (in thousands):

	June 30, 2018
	Notional		Fair
	Amount		Value		Balance Sheet Location
Interest rate swaps	$	70,000	$	1,892	Other non-current assets
Interest rate swaps	$	15,000	$	58	Other current assets

	December 31, 2017
	Notional		Fair
	Amount		Value		Balance Sheet Location
Interest rate swaps	$	55,000	$	1,055	Other non-current assets
Interest rate swaps	$	15,000	$	76	Other current assets

Summary of Effects of Interest Rate Swap

	Gain (Loss) Recognized in AOCL, net of tax					(Loss) Gain Reclassified from AOCL into Expense
	Three Months Ended					Three Months Ended
	June 30,					June 30,
	2018		2017			2018			2017
Interest rate swap	$	176	$	(22	)	$	(87	)	$	42

	Six Months Ended				Six Months Ended
	June 30,				June 30,
	2018		2017		2018			2017
Interest rate swap	$	626	$	71	$	(125	)	$	100

Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2018

Fair Value Disclosures [Abstract]

Summary of Assets and Liabilities Measured at Fair Value on a Recurring Basis

	Level	June 30, 2018			December 31, 2017
Deferred compensation plan assets	1	$	89,987		$	85,589
Corporate and municipal bonds	1	$	53,674		$	51,101
Deferred compensation plan liabilities	1	$	(89,987	)	$	(85,589	)
Interest rate swaps	2	$	1,950		$	1,131
Contingent purchase price liabilities	3	$	(46,528	)	$	(37,574	)

Change in Level 3 Fair Values of Contingent Purchase Price Liabilities

	2018			2017
Beginning balance – January 1	$	(37,574	)	$	(33,709	)
Additions from business acquisitions		(12,361	)		(17,526	)
Settlement of contingent purchase price liabilities		6,457			7,253
Change in fair value of contingencies		(2,562	)		1,032
Change in net present value of contingencies		(488	)		(276	)
Ending balance – June 30	$	(46,528	)	$	(43,226	)

Other Comprehensive Income (Tables)

6 Months Ended

Jun. 30, 2018

Equity [Abstract]

Summary of Other Comprehensive Income and Tax Impact

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2018			2017			2018			2017
Net unrealized gain (loss) on available-for-sale securities, net of income taxes (1)	$	4		$	62		$	(326	)	$	151
Net unrealized gain (loss) on interest rate swaps, net of income taxes (2)		176			(22	)		626			71
Foreign currency translation		(6	)		(3	)		(12	)		(5	)
Total other comprehensive income	$	174		$	37		$	288		$	217

(1)

(2)

Employee Share Plans (Tables)

6 Months Ended

Jun. 30, 2018

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Schedule of Share-Based Compensation Awards

Compensation expense for stock-based awards recognized during the three and six months ended June 30, 2018 and 2017 was as follows (in thousands):

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2018		2017		2018		2017
Stock options	$	1,030	$	524	$	1,548	$	1,050
Restricted stock awards		1,383		891		2,302		1,740
Total stock-based compensation expense	$	2,413	$	1,415	$	3,850	$	2,790

Stock Award Activity

Stock award activity during the six months ended June 30, 2018 was as follows (in thousands, except per share data):

	Stock Options					Restricted Stock Awards
	Number of Options			Weighted Average Exercise Price Per Share		Number of Shares			Weighted Average Grant-Date Fair Value (1)
Outstanding at beginning of year		3,844		$	9.67		724		$	11.78
Granted		642		$	19.45		272		$	18.77
Exercised or released		(616	)	$	7.19		(362	)	$	11.19
Expired or canceled		—		$	—		—		$	—
Outstanding at June 30, 2018		3,870		$	11.69		634		$	15.33
Exercisable at June 30, 2018		2,254		$	9.03

(1)

Represents weighted average market value of the shares; awards are granted at no cost to the recipients.

Schedule of Fair Value Option Award Weighted Average Assumptions Used

	Six Months Ended June 30,
Expected volatility (1)		22.04	%
Expected option life (years) (2)		4.62
Risk-free interest rate (3)		2.80	%
Expected dividend yield (4)		0.00	%

(1)

The expected volatility assumption was determined based upon the historical volatility of our stock price, using daily price intervals.

(2)

(3)

The risk-free interest rate assumption was based upon zero-coupon U.S. Treasury bonds with a term approximating the expected life of the respective options.

(4)

The expected dividend yield assumption was determined in view of our historical and estimated dividend payouts. We do not expect to change our dividend payout policy in the foreseeable future.

Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 2018

Earnings Per Share [Abstract]

Computation of Basic and Diluted Earnings Per Share from Continuing Operations

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2018		2017		2018		2017
Numerator:
Income from continuing operations	$	13,121	$	11,416	$	48,931	$	36,442
Denominator:
Basic
Weighted average common shares outstanding		54,594		53,968		54,334		53,632
Diluted
Stock options (1)		1,550		1,544		1,500		1,524
Restricted stock awards (1)		290		319		329		374
Contingent shares (2)		3		—		3		—
Diluted weighted average common shares outstanding		56,437		55,831		56,166		55,530
Basic earnings per share from continuing operations	$	0.24	$	0.21	$	0.90	$	0.68
Diluted earnings per share from continuing operations	$	0.23	$	0.20	$	0.87	$	0.66

(1)

(2)

Acquisitions (Tables)

6 Months Ended

Jun. 30, 2018

CMF Associates, LLC (“CMF”), Slaton Insurance (“Slaton”) and Pacific Coastal Pension and Insurance Services, Inc. (Pacific Coastal”) [Member]

Schedule of Estimated Fair Values of Assets Acquired and Liabilities Assumed

	Six Months Ended
	June 30,
	2018			2017
Cash	$	306		$	843
Accounts receivable, net		1,920			4,338
Property and equipment, net	$	—		$	24
Other assets		12			151
Identifiable intangible assets		3,864			3,115
Current liabilities		(1,717	)		(4,716	)
Total identifiable net assets	$	4,385		$	3,755
Goodwill		32,255			39,460
Aggregate purchase price	$	36,640		$	43,215

Segment Disclosures (Tables)

6 Months Ended

Jun. 30, 2018

Segment Reporting [Abstract]

Summary of Segment Information

Segment information for the three and six months ended June 30, 2018 and 2017 is presented below. We do not manage our assets on a segment basis, therefore segment assets are not presented below.

	Three Months Ended June 30, 2018
	Financial Services			Benefits and Insurance Services			National Practices		Corporate and Other			Total
Revenue	$	151,737		$	72,753		$	8,151	$	—		$	232,641
Operating expenses		129,070			61,165			7,567		7,300			205,102
Gross margin		22,667			11,588			584		(7,300	)		27,539
Corporate general & admin		—			—			—		9,993			9,993
Operating income (loss)		22,667			11,588			584		(17,293	)		17,546
Other (expense) income:
Interest expense		—			(15	)		—		(1,802	)		(1,817	)
Other (expense) income, net		(17	)		30			—		617			630
Total other (expense) income		(17	)		15			—		(1,185	)		(1,187	)
Income (loss) from continuing operations before income tax expense	$	22,650		$	11,603		$	584	$	(18,478	)	$	16,359

	Three Months Ended June 30, 2017
	Financial Services		Benefits and Insurance Services			National Practices			Corporate and Other			Total
Revenue	$	132,591	$	70,559		$	7,866		$	—		$	211,016
Operating expenses		115,851		59,877			7,235			5,157			188,120
Gross margin		16,740		10,682			631			(5,157	)		22,896
Corporate general & admin		—		—			—			9,232			9,232
Operating income (loss)		16,740		10,682			631			(14,389	)		13,664
Other income (expense):
Interest expense		—		(9	)		—			(1,683	)		(1,692	)
Gain on sale of operations, net		—		—			—			23			23
Other income (expense), net		28		120			(9	)		3,625			3,764
Total other income (expense)		28		111			(9	)		1,965			2,095
Income (loss) from continuing operations before income tax expense	$	16,768	$	10,793		$	622		$	(12,424	)	$	15,759

Segment information for the six months ended June 30, 2018 and 2017 was as follows (in thousands):

	Six Months Ended June 30, 2018
	Financial Services		Benefits and Insurance Services			National Practices		Corporate and Other			Total
Revenue	$	332,340	$	150,083		$	16,308	$	—		$	498,731
Operating expenses		262,103		122,298			14,842		10,609			409,852
Gross margin		70,237		27,785			1,466		(10,609	)		88,879
Corporate general & admin		—		—			—		20,021			20,021
Operating income (loss)		70,237		27,785			1,466		(30,630	)		68,858
Other income (expense):
Interest expense		—		(89	)		—		(3,508	)		(3,597	)
Gain on sale of operations, net		—		—			—		663			663
Other income (expense), net		248		222			—		(1,069	)		(599	)
Total other income (expense)		248		133			—		(3,914	)		(3,533	)
Income (loss) from continuing operations before income tax expense	$	70,485	$	27,918		$	1,466	$	(34,544	)	$	65,325

	Six Months Ended June 30, 2017
	Financial Services		Benefits and Insurance Services			National Practices			Corporate and Other			Total
Revenue	$	291,224	$	145,723		$	15,528		$	—		$	452,475
Operating expenses		235,240		120,019			14,242			11,385			380,886
Gross margin		55,984		25,704			1,286			(11,385	)		71,589
Corporate general & admin		—		—			—			18,000			18,000
Operating income (loss)		55,984		25,704			1,286			(29,385	)		53,589
Other income (expense):
Interest expense		—		(20	)		—			(3,189	)		(3,209	)
Gain on sale of operations, net		—		—			—			45			45
Other income (expense), net		43		216			(9	)		6,251			6,501
Total other income (expense)		43		196			(9	)		3,107			3,337
Income (loss) from continuing operations before income tax expense	$	56,027	$	25,900		$	1,277		$	(26,278	)	$	56,926

Summary of Significant Accounting Policies - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2018 Practice_Groups
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Number of practice groups	3

New Accounting Pronouncements - Additional Information (Detail) $ in Millions	6 Months Ended
	Jun. 30, 2018 USD ($) Business_Units	Jun. 30, 2017 USD ($)
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Number of business units inconsistent with revenue recognition \| Business_Units	2
Accounting Standards Update 2016-18 [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
New accounting pronouncements or adoption of new standard resulted of cash used in (decrease) increase in operating activities	$ (6.6)	$ 7.0
Accounting Standards Update 2016-02 [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Future minimum cash commitments under operating leases	$ 200.0

New Accounting Pronouncements - Schedule of Reconciliation of Cash, Cash Equivalents and Restricted Cash Reported Accompanying Consolidated Balance Sheets (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2016
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Cash and cash equivalents	$ 1,921	$ 424
Restricted cash	39,535	32,985
Total cash, cash equivalents and restricted cash	41,456	$ 33,409	$ 36,085	$ 31,374
Accounting Standards Update 2016-18 [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Cash and cash equivalents	1,921		1,161
Restricted cash	39,535		34,924
Total cash, cash equivalents and restricted cash	$ 41,456		$ 36,085

New Accounting Pronouncements - Summary of Cumulative Effect of Changes Made to Consolidated Balance Sheet (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Accounts receivable, net	$ 245,639		$ 188,300
Other current assets	200,633
Other non-current assets	763,852
Total assets	1,210,124		1,176,231
Accounts payable	80,823		51,375
Accrued personnel costs	42,750		45,264
Other current liabilities	181,839
Deferred income taxes, net	4,000		3,339
Other non-current liabilities	311,886
Total liabilities	621,298		645,352
Retained earnings	395,881		345,302
Other stockholders' equity	192,945
Total stockholders’ equity	588,826		530,879
Total liabilities and stockholders’ equity	$ 1,210,124		1,176,231
Previously Reported [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Accounts receivable, net			188,300
Other current assets			259,873
Other non-current assets			728,058
Total assets			1,176,231
Accounts payable			51,375
Accrued personnel costs			45,264
Other current liabilities			237,607
Deferred income taxes, net			3,339
Other non-current liabilities			307,767
Total liabilities			645,352
Retained earnings			345,302
Other stockholders' equity			185,577
Total stockholders’ equity			530,879
Total liabilities and stockholders’ equity			1,176,231
Accounting Standards Update 2014-09 [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Accounts receivable, net		$ 197,746
Other current assets		259,953
Other non-current assets		728,786
Total assets		1,186,485
Accounts payable		57,656
Accrued personnel costs		45,859
Other current liabilities		237,720
Deferred income taxes, net		3,970
Other non-current liabilities		308,779
Total liabilities		653,984
Retained earnings		346,924
Other stockholders' equity		185,577
Total stockholders’ equity		532,501	$ 532,501
Total liabilities and stockholders’ equity		1,186,485
Accounting Standards Update 2014-09 [Member] \| Adjustments [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Accounts receivable, net		9,446
Other current assets		80
Other non-current assets		728
Total assets		10,254
Accounts payable		6,281
Accrued personnel costs		595
Other current liabilities		113
Deferred income taxes, net		631
Other non-current liabilities		1,012
Total liabilities		8,632
Retained earnings		1,622
Total stockholders’ equity		1,622
Total liabilities and stockholders’ equity		$ 10,254

New Accounting Pronouncements - Summary of Impact of Adopting New Accounting Standards on Consolidated Financial Statements (Detail) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Jan. 01, 2018	Dec. 31, 2017
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Accounts receivable, net	$ 245,639			$ 245,639			$ 188,300
Other current assets	200,633			200,633
Other non-current assets	763,852			763,852
Total assets	1,210,124			1,210,124			1,176,231
Accounts payable	80,823			80,823			51,375
Accrued personnel costs	42,750			42,750			45,264
Other current liabilities	181,839			181,839
Deferred income taxes, net	4,000			4,000			3,339
Other non-current liabilities	311,886			311,886
Total liabilities	621,298			621,298			645,352
Retained earnings	395,881			395,881			345,302
Other stockholders' equity	192,945			192,945
Total stockholders’ equity	588,826			588,826			530,879
Total liabilities and stockholders’ equity	1,210,124			1,210,124			1,176,231
Revenue	232,641	$ 232,641	$ 211,016	498,731	$ 452,475
Operating expenses	205,102		188,120	409,852	380,886
Gross margin	27,539		22,896	88,879	71,589
Corporate general and administrative expenses	9,993		9,232	20,021	18,000
Operating income (loss)	17,546		13,664	68,858	53,589
Other (expense) income:
Interest expense	(1,817)		(1,692)	(3,597)	(3,209)
Gain on sale of operations, net			23	663	45
Other income (expense), net	630		3,764	(599)	6,501
Total other (expense) income, net	(1,187)		2,095	(3,533)	3,337
Income from continuing operations before income tax expense	16,359		15,759	65,325	56,926
Income tax expense	3,238		4,343	16,394	20,484
Income from continuing operations	13,121		11,416	48,931	36,442
(Loss) gain from discontinued operations, net of tax	(15)		(418)	26	(570)
Net income	13,106		10,998	48,957	35,872
Cash flows from operating activities:
Net income	13,106		10,998	48,957	35,872
Adjustments to reconcile net income to net cash provided by operating activities:				18,908
Changes in assets and liabilities, net of acquisitions and divestitures:
Accounts receivable, net				(44,774)	(40,997)
Other assets				(4,955)	(263)
Accounts payable				18,796	14,376
Accrued personnel costs				(3,302)	(9,598)
Other liabilities				(2,617)	1,989
Other				10,245
Operating cash flows provide by continuing operations				41,258	24,778
Operating cash flows used in discontinued operations				(152)	(540)
Net cash provided by operating activities				41,106	24,238
Net provided by investing activities				42,471	31,757
Net cash used in financing activities				(75,530)	(51,284)
Net increase in cash, cash equivalents and restricted cash				8,047
Cash, cash equivalents and restricted cash at beginning of year		33,409		33,409	31,374
Cash, cash equivalents and restricted cash at end of period	41,456		$ 36,085	41,456	$ 36,085
Previously Reported [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Accounts receivable, net							188,300
Other current assets							259,873
Other non-current assets							728,058
Total assets							1,176,231
Accounts payable							51,375
Accrued personnel costs							45,264
Other current liabilities							237,607
Deferred income taxes, net							3,339
Other non-current liabilities							307,767
Total liabilities							645,352
Retained earnings							345,302
Other stockholders' equity							185,577
Total stockholders’ equity							530,879
Total liabilities and stockholders’ equity							1,176,231
Balances without Adoption of Topic 606 [Member] \| Previously Reported [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Accounts receivable, net	233,753			233,753
Other current assets	200,553			200,553
Other non-current assets	763,165			763,165
Total assets	1,197,471			1,197,471
Accounts payable	73,024			73,024
Accrued personnel costs	42,168			42,168
Other current liabilities	181,725			181,725
Deferred income taxes, net	3,130			3,130
Other non-current liabilities	310,933			310,933
Total liabilities	610,980			610,980
Retained earnings	393,546			393,546
Other stockholders' equity	192,945			192,945
Total stockholders’ equity	586,491			586,491
Total liabilities and stockholders’ equity	1,197,471			1,197,471
Revenue	232,158			497,750
Operating expenses	205,146			409,823
Gross margin	27,012			87,927
Corporate general and administrative expenses	9,993			20,021
Operating income (loss)	17,019			67,906
Other (expense) income:
Interest expense	(1,817)			(3,597)
Gain on sale of operations, net				663
Other income (expense), net	630			(599)
Total other (expense) income, net	(1,187)			(3,533)
Income from continuing operations before income tax expense	15,832			64,373
Income tax expense	3,113			16,155
Income from continuing operations	12,719			48,218
(Loss) gain from discontinued operations, net of tax	(15)			26
Net income	12,704			48,244
Cash flows from operating activities:
Net income	12,704			48,244
Adjustments to reconcile net income to net cash provided by operating activities:				18,908
Changes in assets and liabilities, net of acquisitions and divestitures:
Accounts receivable, net				(42,334)
Other assets				(4,996)
Accounts payable				17,278
Accrued personnel costs				(3,289)
Other liabilities				(2,798)
Other				10,245
Operating cash flows provide by continuing operations				41,258
Operating cash flows used in discontinued operations				(152)
Net cash provided by operating activities				41,106
Net provided by investing activities				42,471
Net cash used in financing activities				(75,530)
Net increase in cash, cash equivalents and restricted cash				8,047
Cash, cash equivalents and restricted cash at beginning of year		$ 33,409		33,409
Cash, cash equivalents and restricted cash at end of period	41,456			41,456
Accounting Standards Update 2014-09 [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Accounts receivable, net						$ 197,746
Other current assets						259,953
Other non-current assets						728,786
Total assets						1,186,485
Accounts payable						57,656
Accrued personnel costs						45,859
Other current liabilities						237,720
Deferred income taxes, net						3,970
Other non-current liabilities						308,779
Total liabilities						653,984
Retained earnings						346,924
Other stockholders' equity						185,577
Total stockholders’ equity						532,501	$ 532,501
Total liabilities and stockholders’ equity						1,186,485
Accounting Standards Update 2014-09 [Member] \| Adjustments [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Accounts receivable, net						9,446
Other current assets						80
Other non-current assets						728
Total assets						10,254
Accounts payable						6,281
Accrued personnel costs						595
Other current liabilities						113
Deferred income taxes, net						631
Other non-current liabilities						1,012
Total liabilities						8,632
Retained earnings						1,622
Total stockholders’ equity						1,622
Total liabilities and stockholders’ equity						$ 10,254
Accounting Standards Update 2014-09 [Member] \| Adjustments [Member] \| Adjustments [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Accounts receivable, net	(11,886)			(11,886)
Other current assets	(80)			(80)
Other non-current assets	(687)			(687)
Total assets	(12,653)			(12,653)
Accounts payable	(7,799)			(7,799)
Accrued personnel costs	(582)			(582)
Other current liabilities	(114)			(114)
Deferred income taxes, net	(870)			(870)
Other non-current liabilities	(953)			(953)
Total liabilities	(10,318)			(10,318)
Retained earnings	(2,335)			(2,335)
Total stockholders’ equity	(2,335)			(2,335)
Total liabilities and stockholders’ equity	(12,653)			(12,653)
Revenue	(483)			(981)
Operating expenses	44			(29)
Gross margin	(527)			(952)
Operating income (loss)	(527)			(952)
Other (expense) income:
Income from continuing operations before income tax expense	(527)			(952)
Income tax expense	(125)			(239)
Income from continuing operations	(402)			(713)
Net income	(402)			(713)
Cash flows from operating activities:
Net income	$ (402)			(713)
Changes in assets and liabilities, net of acquisitions and divestitures:
Accounts receivable, net				2,440
Other assets				(41)
Accounts payable				(1,518)
Accrued personnel costs				13
Other liabilities				$ (181)

Revenue - Summary of Disaggregation of Revenue by Source (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Disaggregation Of Revenue [Line Items]
Revenue	$ 232,641	$ 232,641	$ 211,016	$ 498,731	$ 452,475
Accounting, Tax, Advisory and Consulting [Member]
Disaggregation Of Revenue [Line Items]
Revenue		151,737		332,340
Managed Networking, Hardware Services [Member]
Disaggregation Of Revenue [Line Items]
Revenue		6,121		12,079
National Practices Consulting [Member]
Disaggregation Of Revenue [Line Items]
Revenue		2,030		3,999
Core Benefits and Insurance Services [Member]
Disaggregation Of Revenue [Line Items]
Revenue		68,978		143,100
Non-core Benefits and Insurance Services [Member]
Disaggregation Of Revenue [Line Items]
Revenue		3,775		6,983
Other National Practices [Member]
Disaggregation Of Revenue [Line Items]
Revenue				230
Financial Services [Member]
Disaggregation Of Revenue [Line Items]
Revenue		151,737		332,340
Financial Services [Member] \| Accounting, Tax, Advisory and Consulting [Member]
Disaggregation Of Revenue [Line Items]
Revenue		151,737		332,340
Benefits and Insurance Services [Member]
Disaggregation Of Revenue [Line Items]
Revenue		72,753		150,083
Benefits and Insurance Services [Member] \| Core Benefits and Insurance Services [Member]
Disaggregation Of Revenue [Line Items]
Revenue		68,978		143,100
Benefits and Insurance Services [Member] \| Non-core Benefits and Insurance Services [Member]
Disaggregation Of Revenue [Line Items]
Revenue		3,775		6,983
National Practices [Member]
Disaggregation Of Revenue [Line Items]
Revenue		8,151		16,308
National Practices [Member] \| Managed Networking, Hardware Services [Member]
Disaggregation Of Revenue [Line Items]
Revenue		6,121		12,079
National Practices [Member] \| National Practices Consulting [Member]
Disaggregation Of Revenue [Line Items]
Revenue		$ 2,030		3,999
National Practices [Member] \| Other National Practices [Member]
Disaggregation Of Revenue [Line Items]
Revenue				$ 230

Revenue - Additional Information (Detail)	6 Months Ended
Revenue - Additional Information (Detail)	Jun. 30, 2018
Revenue Recognition And Deferred Revenue [Abstract]
Capitalized contract period	one year or less
Performance obligations period	one year or less

Accounts Receivable, Net - Accounts Receivables Net (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Accounts Receivable Net Current [Abstract]
Trade accounts receivable	$ 181,572	$ 139,730
Unbilled revenue, at net realizable value	79,527	62,397
Total accounts receivable	261,099	202,127
Allowance for doubtful accounts	(15,460)	(13,827)
Accounts receivable, net	$ 245,639	$ 188,300

Goodwill and Other Intangible Assets, Net - Components of Goodwill and Other Intangible Assets, Net (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 560,688	$ 528,424
Intangible assets:
Total intangible assets	189,436	185,988
Total goodwill and intangibles assets	750,124	714,412
Accumulated amortization:
Total accumulated amortization	(109,812)	(101,206)
Goodwill and other intangible assets, net	640,312	613,206
Client Lists [Member]
Intangible assets:
Total intangible assets	180,070	177,221
Accumulated amortization:
Total accumulated amortization	(105,048)	(97,063)
Other Intangible Assets [Member]
Intangible assets:
Total intangible assets	9,366	8,767
Accumulated amortization:
Total accumulated amortization	$ (4,764)	$ (4,143)

Depreciation and Amortization - Depreciation and Amortization Expense for Property and Equipment and Intangible Assets (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Property, Plant and Equipment [Line Items]
Total depreciation expense	$ 5,901	$ 5,638	$ 11,676	$ 11,279
Operating Expenses [Member]
Property, Plant and Equipment [Line Items]
Total depreciation expense	5,825	5,546	11,507	11,089
Corporate General and Administrative Expenses [Member]
Property, Plant and Equipment [Line Items]
Total depreciation expense	$ 76	$ 92	$ 169	$ 190

Debt and Financing Arrangements - Additional Information (Detail) - USD ($) $ in Millions		6 Months Ended
	Apr. 03, 2018	Jun. 30, 2018
2018 Credit Facility [Member]
Debt Instrument [Line Items]
Credit agreement amendment date	Apr. 03, 2018
Unsecured credit facility	$ 400.0
Extension of maturity date	2023	2019
Revolving loan commitment	$ 400.0
Deferred financing costs		$ 1.1
2014 Credit Facility [Member]
Debt Instrument [Line Items]
Credit agreement amendment date		Jul. 28, 2014
2014 Credit Facility [Member] \| First Amendment [Member]
Debt Instrument [Line Items]
Credit agreement amendment date		Apr. 10, 2015
2014 Credit Facility [Member] \| Second Amendment [Member]
Debt Instrument [Line Items]
Credit agreement amendment date		Nov. 03, 2015

Debt and Financing Arrangements (Bank Debt) - Additional Information (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Outstanding balance under applicable credit facility	$ 180,200	$ 178,500
Outstanding letters of credit	900	2,300
2018 Credit Facility [Member]
Debt Instrument [Line Items]
Outstanding balance under applicable credit facility	180,200
Available funds under credit facility	200,000
Outstanding letters of credit	$ 900
2014 Credit Facility [Member]
Debt Instrument [Line Items]
Outstanding balance under applicable credit facility		$ 178,500

- Definition

The carrying value as of the balance sheet date of the noncurrent portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References + Details

Debt and Financing Arrangements - Summary of Unsecured Credit Facility (Detail)	Jun. 30, 2018	Jun. 30, 2017
Debt Instrument [Line Items]
Weighted average rates	3.03%	2.60%
Minimum [Member]
Debt Instrument [Line Items]
Range of effective rates	2.37%	2.19%
Maximum [Member]
Debt Instrument [Line Items]
Range of effective rates	5.00%	4.75%

Debt and Financing Arrangements (Interest Expense) - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Debt Instrument [Line Items]
Interest expense	$ 1,817	$ 1,692	$ 3,597	$ 3,209
2018 Credit Facility [Member]
Debt Instrument [Line Items]
Interest expense	$ 1,800		$ 3,600
2014 Credit Facility [Member]
Debt Instrument [Line Items]
Interest expense		$ 1,700		$ 3,200

Commitments and Contingencies (Letters of Credit and Guarantees) - Additional Information (Detail) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Commitments And Contingencies Disclosure [Abstract]
Letters of credit outstanding	$ 0.9	$ 2.3
License bonds outstanding amount	$ 2.9	$ 2.5

Commitments and Contingencies (Legal Proceedings) - Additional Information (Detail)		6 Months Ended
	Sep. 16, 2016 USD ($)	Jun. 30, 2018 USD ($) Plaintiff
Baldino Group [Member]
Commitments And Contingencies [Line Items]
Number of Plaintiffs \| Plaintiff		2
Damages sought amount		$ 16,000,000
Altoona Regional Health System [Member] \| Minimum [Member]
Commitments And Contingencies [Line Items]
Damages sought amount	$ 142,000,000

Financial Instruments (Bonds) - Additional Information (Detail) - USD ($)	6 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Derivatives Fair Value [Line Items]
Corporate and municipal bonds	$ 52,600,000	$ 49,500,000
Maturity dates of bonds, start date	2018-07
Maturity dates of bonds, end date	2023-11
Interest Rate Swap [Member]
Derivatives Fair Value [Line Items]
Notional value	$ 15,000,000
Interest rate swap, fixed interest rate	1.155%
Interest rate swap, description of interest received	interest that varies with the one-month LIBOR
Derivative, Type of Interest Rate Paid on Swap	fixed
Interest Rate Swap [Member] \| October 2020 [Member]
Derivatives Fair Value [Line Items]
Notional value	$ 25,000,000
Interest rate swap, fixed interest rate	1.30%
Interest Rate Swap [Member] \| February 2021 [Member]
Derivatives Fair Value [Line Items]
Notional value	$ 10,000,000
Interest rate swap, fixed interest rate	1.12%
Interest Rate Swap [Member] \| May 2022 [Member]
Derivatives Fair Value [Line Items]
Notional value	$ 20,000,000
Interest rate swap, fixed interest rate	1.77%
Interest Rate Swap [Member] \| June 2023 [Member]
Derivatives Fair Value [Line Items]
Notional value	$ 15,000,000
Interest rate swap, fixed interest rate	2.64%

Financial Instruments - Summary of Bond Activity (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Fair value at beginning of period	$ 51,101	$ 44,573
Purchases	10,345	15,546
Redemptions	(1,098)	(940)
Maturities	(6,175)	(7,845)
Decrease in bond premium	(48)	(160)
Fair market value adjustment	(451)	(73)
Fair value at end of period	$ 53,674	$ 51,101

Financial Instruments (Interest Rate Swaps) - Additional Information (Detail) - Interest Rate Swap [Member] - USD ($)	3 Months Ended
	Jun. 30, 2017	Jun. 30, 2018
Schedule Of Available For Sale Securities [Line Items]
Notional value		$ 15,000,000
Interest rate swap, fixed interest rate		1.155%
Interest rate swap, term	5 years
Maturities Five Years [Member]
Schedule Of Available For Sale Securities [Line Items]
Notional value	$ 15,000,000
Interest rate swap, fixed interest rate	2.64%

Financial Instruments - Summary of Outstanding Interest Rate Swaps (Detail) - Interest Rate Swap [Member] - USD ($)	Jun. 30, 2018	Dec. 31, 2017
Derivatives Fair Value [Line Items]
Notional Amount	$ 15,000,000
Other Non-current Assets [Member]
Derivatives Fair Value [Line Items]
Notional Amount	70,000,000	$ 55,000,000
Fair Value	1,892,000	1,055,000
Other Current Assets [Member]
Derivatives Fair Value [Line Items]
Notional Amount	15,000,000	15,000,000
Fair Value	$ 58,000	$ 76,000

Financial Instruments - Summary of Effects of Interest Rate Swaps (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Derivatives Fair Value [Line Items]
Gain (Loss) Recognized in AOCL, net of tax	$ 176	$ (22)	$ 626	$ 71
Interest Rate Swap [Member] \| Interest Expense [Member]
Derivatives Fair Value [Line Items]
Gain (Loss) Recognized in AOCL, net of tax	176	(22)	626	71
(Loss) Gain Reclassified from AOCL into Expense	$ (87)	$ 42	$ (125)	$ 100

Fair Value Measurements - Summary of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Corporate and municipal bonds	$ 53,674	$ 51,101	$ 44,573
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation plan assets	89,987	85,589
Corporate and municipal bonds	53,674	51,101
Deferred compensation plan liabilities	(89,987)	(85,589)
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swaps	1,950	1,131
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent purchase price liabilities	$ (46,528)	$ (37,574)

Fair Value Measurements - Additional Information (Detail) - USD ($)	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Fair Value Disclosures [Abstract]
Fair Value Measurements, Inter-transfers between Levels	$ 0	$ 0

Fair Value Measurements - Change in Level 3 Fair Values of Contingent Purchase Price Liabilities (Detail) - Level 3 [Member] - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	$ (37,574)
Ending balance	(46,528)
Contingent Purchase Price Liabilities [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	(37,574)	$ (33,709)
Additions from business acquisitions	(12,361)	(17,526)
Settlement of contingent purchase price liabilities	6,457	7,253
Change in fair value of contingencies	(2,562)	1,032
Change in net present value of contingencies	(488)	(276)
Ending balance	$ (46,528)	$ (43,226)

Other Comprehensive Income - Summary of Other Comprehensive Income and Tax Impact (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Other Comprehensive Income Loss Net Of Tax Period Increase Decrease [Abstract]
Net unrealized gain (loss) on available-for-sale securities, net of income taxes	$ 4	$ 62	$ (326)	$ 151
Net unrealized gain (loss) on interest rate swaps, net of income taxes	176	(22)	626	71
Foreign currency translation	(6)	(3)	(12)	(5)
Total other comprehensive income	$ 174	$ 37	$ 288	$ 217

Other Comprehensive Income - Summary of Other Comprehensive Income and Tax Impact (Parenthetical) (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Other Comprehensive Income Loss Net Of Tax Period Increase Decrease [Abstract]
Unrealized gain (loss) on available for sale securities, income tax expense (benefit)	$ 1	$ 41	$ (121)	$ 100
Unrealized gain on interest rate swaps, income tax expense (benefit)	$ (54)	$ 13	$ 193	$ 42

Other Comprehensive Income - Additional Information (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Accumulated Other Comprehensive Income Loss Net Of Tax [Abstract]
Accumulated other comprehensive income (loss), net of tax	$ 106	$ (182)

Employee Share Plans - Additional Information (Detail) shares in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2018 $ / shares shares	Jun. 30, 2018 shares
Compensation And Retirement Disclosure [Abstract]
Maximum stock based compensation awards granted under the plan \| shares	9.6	9.6
Stock awards expiry		2024
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Method Used		Black-Scholes-Merton options-pricing model
Fair value of stock options granted \| $ / shares	$ 4.73

Employee Share Plans - Schedule of Share-Based Compensation Awards (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Compensation And Retirement Disclosure [Abstract]
Stock options	$ 1,030	$ 524	$ 1,548	$ 1,050
Restricted stock awards	1,383	891	2,302	1,740
Total stock-based compensation expense	$ 2,413	$ 1,415	$ 3,850	$ 2,790

Employee Share Plans - Stock Award Activity (Detail) shares in Thousands	6 Months Ended
	Jun. 30, 2018 $ / shares shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Outstanding Beginning balance, Number of Options \| shares	3,844
Granted, Number of Options \| shares	642
Exercised or released, Number of options \| shares	(616)
Outstanding Ending balance, Number of Options \| shares	3,870
Exercisable Ending balance, Number of Options \| shares	2,254
Outstanding Beginning balance, Weighted Average Exercise Price Per Share \| $ / shares	$ 9.67
Granted, Weighted Average Exercise Price Per Share \| $ / shares	19.45
Exercised or released, Weighted Average Exercise Price Per Share \| $ / shares	7.19
Outstanding Ending balance, Weighted Average Exercise Price Per Share \| $ / shares	11.69
Exercisable Ending balance, Weighted Average Exercise Price \| $ / shares	$ 9.03
Restricted Stock Awards [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Outstanding Beginning balance, Number of shares \| shares	724
Granted, Number of shares \| shares	272
Exercised or released, Number of shares \| shares	(362)
Outstanding Ending balance, Number of shares \| shares	634
Outstanding Beginning balance, Weighted Average Grant-Date Fair Value \| $ / shares	$ 11.78
Granted, Weighted Average Grant-Date Fair Value \| $ / shares	18.77
Exercised or released, Weighted Average Grant Date Fair Value \| $ / shares	11.19
Outstanding Ending balance, Weighted Average Grant-Date Fair Value \| $ / shares	$ 15.33

Employee Share Plans - Schedule of Fair Value Option Award Weighted Average Assumptions Used (Detail)	6 Months Ended
	Jun. 30, 2018
Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions And Methodology [Abstract]
Expected volatility	22.04%
Expected option life (years)	4 years 7 months 13 days
Risk-free interest rate	2.80%
Expected dividend yield	0.00%

Earnings Per Share - Computation of Basic and Diluted Earnings Per Share for Continuing Operations (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Numerator:
Income from continuing operations	$ 13,121	$ 11,416	$ 48,931	$ 36,442
Basic
Weighted average common shares outstanding	54,594	53,968	54,334	53,632
Diluted
Stock options	1,550	1,544	1,500	1,524
Restricted stock awards	290	319	329	374
Contingent shares	3		3
Diluted weighted average common shares outstanding	56,437	55,831	56,166	55,530
Basic earnings per share from continuing operations	$ 0.24	$ 0.21	$ 0.90	$ 0.68
Diluted earnings per share from continuing operations	$ 0.23	$ 0.20	$ 0.87	$ 0.66

Earnings Per Share - Computation of Basic and Diluted Earnings Per Share for Continuing Operations (Parenthetical) (Detail) - shares shares in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Stock Compensation Plan [Member]
Dilutive Securities Included and Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Share based awards excluded from the calculation of diluted earnings per share	0.4	0.5	0.7	0.2

Acquisitions (First Half 2018) - Additional Information (Detail) $ in Millions	6 Months Ended
	Jun. 30, 2018 USD ($) Business	Jun. 30, 2017 USD ($) Business
Business Acquisition Contingent Consideration [Line Items]
Consideration paid in cash	$ 23.4	$ 23.7
Consideration paid in common stock	0.9	2.0
Contingent consideration	12.4	17.5
Contingent consideration, current	3.4
Contingent consideration, non-current	9.0
Annual revenue	$ 9.1	$ 23.2
Number of businesses acquired \| Business		3
InR Advisory Services, LLC [Member]
Business Acquisition Contingent Consideration [Line Items]
Effective date of acquisition	Apr. 01, 2018
Acquired entity, name	InR Advisory Services, LLC
Number of businesses acquired \| Business	2
Laurus Transaction Advisors, LLC[Member]
Business Acquisition Contingent Consideration [Line Items]
Effective date of acquisition	Feb. 01, 2018
Acquired entity, name	Laurus Transaction Advisors, LLC

Acquisitions (First Half 2017) - Additional Information (Detail) $ in Thousands	6 Months Ended
	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($) Business	Dec. 31, 2017 USD ($)
Business Acquisition Contingent Consideration [Line Items]
Number of businesses acquired \| Business		3
Consideration paid in cash	$ 23,400	$ 23,700
Consideration paid in common stock	900	2,000
Contingent consideration	12,400	17,500
Contingent consideration, current	27,344	5,900	$ 15,151
Contingent consideration, non-current	19,184	11,600	$ 22,423
Annual revenue	$ 9,100	$ 23,200
C M F Associates Limited Liability Company
Business Acquisition Contingent Consideration [Line Items]
Acquired entity, name		CMF Associates, LLC
Effective date of acquisition		Jun. 01, 2017
Slaton Insurance
Business Acquisition Contingent Consideration [Line Items]
Acquired entity, name		Slaton Insurance
Effective date of acquisition		Jun. 01, 2017
Pacific Coastal Pension And Insurance Services Inc
Business Acquisition Contingent Consideration [Line Items]
Acquired entity, name		Pacific Coastal Pension and Insurance Services, Inc.
Effective date of acquisition		Feb. 01, 2017

Acquisitions - Schedule of Estimated Fair Values of Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Jun. 30, 2017	Mar. 31, 2017
Business Acquisition [Line Items]
Goodwill	$ 560,688		$ 528,424
CMF Associates, LLC (“CMF”), Slaton Insurance (“Slaton”) and Pacific Coastal Pension and Insurance Services, Inc. (Pacific Coastal”) [Member]
Business Acquisition [Line Items]
Cash	306			$ 843
Accounts receivable, net	1,920			4,338
Property and equipment, net				24
Other assets	12			151
Identifiable intangible assets	3,864			3,115
Current liabilities	(1,717)			(4,716)
Total identifiable net assets	4,385			3,755
Goodwill	32,255	$ 32,300		39,460	$ 39,500
Aggregate purchase price	$ 36,640			$ 43,215

Acquisitions - Additional Information (Detail) $ in Thousands	6 Months Ended
	Jun. 30, 2018 USD ($) Client_List shares	Jun. 30, 2017 USD ($) Client_List shares	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Mar. 31, 2017 USD ($)
Business Acquisition Contingent Consideration [Line Items]
Goodwill	$ 560,688			$ 528,424
Contingent consideration	12,400	$ 17,500
Fair value of contingent consideration	3,100	800
Consideration paid in cash	4,100	4,800
Consideration paid in cash	$ 23,400	$ 23,700
Number of common stock issued \| shares	56,000	177,000
CMF Associates, LLC (“CMF”), Slaton Insurance (“Slaton”) and Pacific Coastal Pension and Insurance Services, Inc. (Pacific Coastal”) [Member]
Business Acquisition Contingent Consideration [Line Items]
Goodwill	$ 32,255	$ 39,460	$ 32,300		$ 39,500
Acquisition of Client Lists [Member]
Business Acquisition Contingent Consideration [Line Items]
Contingent consideration		$ 700
Acquisition of Client Lists [Member] \| Benefits and Insurance Services Practice Group [Member]
Business Acquisition Contingent Consideration [Line Items]
Number of client list purchased \| Client_List	0	1
Previous Client List Purchases [Member]
Business Acquisition Contingent Consideration [Line Items]
Consideration paid in cash	$ 600	$ 700

Discontinued Operations and Divestitures - Additional Information (Detail) $ in Millions	6 Months Ended		12 Months Ended
	Jun. 30, 2018 USD ($) Office	Jun. 30, 2017 Office	Dec. 31, 2015 Business
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Number of business divestiture \| Office	0	0
Financial Services [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Number Of Businesses Sold \| Business			2
Benefits and Insurance Services Practice Group [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Gain from the sale of its individual wealth management business \| $	$ 0.7

Segment Disclosures - Additional Information (Detail)	6 Months Ended
Segment Disclosures - Additional Information (Detail)	Jun. 30, 2018 Practice_Groups
Segment Reporting [Abstract]
Number of business units of the company	3

Segment Disclosures - Summary of Segment Information (Detail) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Segment Reporting Information [Line Items]
Revenue	$ 232,641	$ 232,641	$ 211,016	$ 498,731	$ 452,475
Operating expenses	205,102		188,120	409,852	380,886
Gross margin	27,539		22,896	88,879	71,589
Corporate general & admin	9,993		9,232	20,021	18,000
Operating income (loss)	17,546		13,664	68,858	53,589
Other (expense) income:
Interest expense	(1,817)		(1,692)	(3,597)	(3,209)
Other (expense) income, net	630		3,764	(599)	6,501
Gain on sale of operations, net			23	663	45
Total other (expense) income, net	(1,187)		2,095	(3,533)	3,337
Income from continuing operations before income tax expense	16,359		15,759	65,325	56,926
Financial Services [Member]
Segment Reporting Information [Line Items]
Revenue		151,737		332,340
Benefits and Insurance Services [Member]
Segment Reporting Information [Line Items]
Revenue		72,753		150,083
National Practices [Member]
Segment Reporting Information [Line Items]
Revenue		$ 8,151		16,308
Operating Segments [Member] \| Financial Services [Member]
Segment Reporting Information [Line Items]
Revenue	151,737		132,591	332,340	291,224
Operating expenses	129,070		115,851	262,103	235,240
Gross margin	22,667		16,740	70,237	55,984
Operating income (loss)	22,667		16,740	70,237	55,984
Other (expense) income:
Other (expense) income, net	(17)		28	248	43
Total other (expense) income, net	(17)		28	248	43
Income from continuing operations before income tax expense	22,650		16,768	70,485	56,027
Operating Segments [Member] \| Benefits and Insurance Services [Member]
Segment Reporting Information [Line Items]
Revenue	72,753		70,559	150,083	145,723
Operating expenses	61,165		59,877	122,298	120,019
Gross margin	11,588		10,682	27,785	25,704
Operating income (loss)	11,588		10,682	27,785	25,704
Other (expense) income:
Interest expense	(15)		(9)	(89)	(20)
Other (expense) income, net	30		120	222	216
Total other (expense) income, net	15		111	133	196
Income from continuing operations before income tax expense	11,603		10,793	27,918	25,900
Operating Segments [Member] \| National Practices [Member]
Segment Reporting Information [Line Items]
Revenue	8,151		7,866	16,308	15,528
Operating expenses	7,567		7,235	14,842	14,242
Gross margin	584		631	1,466	1,286
Operating income (loss)	584		631	1,466	1,286
Other (expense) income:
Other (expense) income, net			(9)		(9)
Total other (expense) income, net			(9)		(9)
Income from continuing operations before income tax expense	584		622	1,466	1,277
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Operating expenses	7,300		5,157	10,609	11,385
Gross margin	(7,300)		(5,157)	(10,609)	(11,385)
Corporate general & admin	9,993		9,232	20,021	18,000
Operating income (loss)	(17,293)		(14,389)	(30,630)	(29,385)
Other (expense) income:
Interest expense	(1,802)		(1,683)	(3,508)	(3,189)
Other (expense) income, net	617		3,625	(1,069)	6,251
Gain on sale of operations, net			23	663	45
Total other (expense) income, net	(1,185)		1,965	(3,914)	3,107
Income from continuing operations before income tax expense	$ (18,478)		$ (12,424)	$ (34,544)	$ (26,278)

Subsequent Events - Additional Information (Detail) - Subsequent Event [Member] shares in Millions, $ in Millions	Jul. 31, 2018 USD ($) shares
Subsequent Event [Line Items]
Stock repurchased, shares \| shares	0.1
Stock repurchased, value \| $	$ 1.2