Proceeds from sales of assets and divested operations Proceeds from Divestiture of Businesses Total accumulated amortization Finite-Lived Intangible Assets, Accumulated Amortization Cash equivalents included in funds held for clients Cash Equivalents Included In Funds Held For Clients Cash equivalents included in funds held for clients. Summary of Investments Debt Securities, Available-for-Sale [Table Text Block] Award Timing Predetermined Award Timing Predetermined [Flag] Entity File Number Entity File Number Additional Paid-In Capital Additional Paid-in Capital [Member] Tabular List, Table Tabular List [Table Text Block] IDG Acquisition IDG Acquisition [Member] IDG Acquisition Recent Accounting Pronouncements, Accounting Standards Adopted, and Accounting Standards Issued But Not Yet Adopted New Accounting Pronouncements, Policy [Policy Text Block] Restricted stock units and awards Restricted Stock or Unit Expense Annual amortization rate, year five Debt Instrument, Annual Principal Amortization Payments Rate, Year Five Debt Instrument, Annual Principal Amortization Payments Rate, Year Five Secured Overnight Financing Rate (SOFR) Secured Overnight Financing Rate (SOFR) [Member] Share-based Payment Arrangement Share-Based Payment Arrangement [Member] Adjustment to Compensation: Adjustment to Compensation [Axis] RELATED PARTIES Related Party Transactions Disclosure [Text Block] Schedule Of Common Stock [Table] Schedule Of Common Stock [Table] Schedule Of Common Stock [Table] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] REVENUE Revenue from Contract with Customer [Text Block] Unrealized loss on interest rate swaps, income tax expense (benefit) Accumulated Other Comprehensive Income Unrealized Holding Gain Loss On Derivatives Arising During Period Tax Accumulated Other Comprehensive Income Unrealized Holding Gain Loss On Derivatives Arising During Period Tax Shares purchased under ESPP Stock Issued During Period, Shares, Employee Stock Purchase Plans Total Current Income Tax Expense (Benefit) Adjustment to Compensation, Amount Adjustment to Compensation Amount Commitments And Contingencies [Table] Commitments And Contingencies [Table] Commitments and contingencies. Other assets Increase (Decrease) in Other Operating Assets Stock-based compensation expense Share-Based Payment Arrangement, Noncash Expense Notional amount, asset Derivative Asset, Notional Amount Employee Stock Option Share-Based Payment Arrangement, Option [Member] Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Notes receivable Financing Receivable, after Allowance for Credit Loss Cash and Cash Equivalents Cash and Cash Equivalents, Policy [Policy Text Block] Percent Effective Income Tax Rate Reconciliation, Percent [Abstract] Antidilutive Securities [Axis] Antidilutive Securities [Axis] Total stockholders’ equity Beginning balance Ending balance Total stockholders' equity Equity, Attributable to Parent Debt Securities, Available-for-sale [Table] Debt Securities, Available-for-Sale [Table] Other comprehensive income (loss): Other Comprehensive Income (Loss), Net of Tax [Abstract] Insider Trading Policies and Procedures [Line Items] Summary of Property and Equipment, Net Property, Plant and Equipment [Table Text Block] Common stock, shares authorized (in shares) Common Stock, Shares Authorized Increase in accrued personnel obligations Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Accrued Personnel Obligations Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Accrued Personnel Obligations Cover [Abstract] Cover [Abstract] Adjustments, Total liabilities assumed Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Liability Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Liability Maximum Maximum [Member] Intangible assets amortization period Finite-Lived Intangible Asset, Useful Life Liability for interest expense Unrecognized Tax Benefits, Interest on Income Taxes Accrued Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Debt Instrument [Line Items] Debt Instrument [Line Items] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Adjustments, Other intangible assets Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles Retirement Benefits [Abstract] Retirement Benefits [Abstract] Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Income before income tax expense Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Entity Shell Company Entity Shell Company Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Operating Segments Operating Segments [Member] Summary of Cash Flow, Supplemental Disclosures Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] Operating lease, remaining lease term Lessee, Operating Lease, Remaining Lease Term Non-deductible officers' compensation Effective Income Tax Rate Reconciliation, Nondeductible Expense, Officers' Compensation Amount Effective Income Tax Rate Reconciliation, Nondeductible Expense, Officers' Compensation Amount Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Short-term debt Short-Term Debt [Abstract] Total goodwill and other intangibles assets Intangible Assets Including Goodwill Gross Gross amount of finite-lived intangible assets including goodwill. Net income Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent Summary of Changes to the Allowance for Doubtful Accounts on Accounts Receivable Schedule Of Changes In Allowance For Doubtful Accounts Table [Table Text Block] Schedule of changes in allowance for doubtful accounts. Income taxes payable Accrued Income Taxes, Noncurrent United States Income (Loss) from Continuing Operations before Income Taxes, Domestic Summary of Share-Based Compensation Awards Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] Lease liability Operating Lease, Liability, Current Capitalized software Capitalized software Software and Software Development Costs [Member] Document Fiscal Period Focus Document Fiscal Period Focus Goodwill and other intangible assets, net Goodwill and other intangible assets, net Intangible Assets, Net (Including Goodwill) Derivatives, Fair Value [Line Items] Derivatives, Fair Value [Line Items] Award Timing Method Award Timing Method [Text Block] Basic earnings per share (in dollars per share) Income (Loss) from Continuing Operations, Per Basic Share Litigation Case [Domain] Litigation Case [Domain] Furniture and fixtures Furniture and fixtures Furniture and Fixtures [Member] Award Type [Axis] Award Type [Axis] Foreign currency translation Accumulated Foreign Currency Adjustment Attributable to Parent [Member] Percent of EBITDA Line Of Credit Facility, Accordion Feature, Percent Of EBITDA Line Of Credit Facility, Accordion Feature, Percent Of EBITDA Interest Rate Swap, July 14, 2030 Expiration Interest Rate Swap, July 14, 2030 Expiration [Member] Interest Rate Swap, July 14, 2030 Expiration Share-Based Compensation Share-Based Payment Arrangement [Policy Text Block] Trading Symbol Trading Symbol 2029 Lessee, Operating Lease, Liability, to be Paid, Year Four Business Combinations Business Combination [Policy Text Block] Change in valuation allowances Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent Summary of Components of Goodwill and Other Intangible Assets, Net Schedule of Intangible Assets and Goodwill [Table Text Block] Restricted stock units and awards and Performance share units (in shares) Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture Achievement of an earnings per share target Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Percentage Of Target Earnings Per Share Share based compensation arrangement by share based payment award equity instruments other than options percentage of target earnings per share. Business Combination, Contingent Consideration [Table] Business Combination, Contingent Consideration [Table] Entity Address, City or Town Entity Address, City or Town Short-term Debt, Type [Domain] Short-Term Debt, Type [Domain] Total deferred tax assets, net Deferred Tax Assets, Net of Valuation Allowance Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Statement of Income Location, Balance [Domain] Statement of Income Location, Balance [Domain] Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Total consideration transferred Business Combination, Consideration Transferred Entity Emerging Growth Company Entity Emerging Growth Company Number of monthly installments for remaining shares issuable Business Acquisition, Equity Interest, Number Of Monthly Installments For Remaining Shares Issuable Business Acquisition, Equity Interest, Number Of Monthly Installments For Remaining Shares Issuable Stock options outstanding (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number Trade accounts receivable Billed Contracts Receivable Payments of bank debt Repayments of Lines of Credit Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Additions from business acquisitions Additions from business acquisitions Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases Interest Rate Swap, July 15, 2030 Expiration Interest Rate Swap, July 15, 2030 Expiration [Member] Interest Rate Swap, July 15, 2030 Expiration Contingent shares (in shares) Incremental Common Shares Attributable to Dilutive Effect of Contingently Issuable Shares Common stock, shares, outstanding (in shares) Common Stock, Shares, Outstanding Provision Accounts Receivable, Credit Loss Expense (Reversal) Other depository assets Other Assets, Fair Value Disclosure ACCOUNTS RECEIVABLE, NET Loans, Notes, Trade and Other Receivables Disclosure [Text Block] Summary of Disaggregation of Revenue by Source Disaggregation of Revenue [Table Text Block] Contingent purchase price liabilities Contingent Purchase Price Liabilities At Fair Value Contingent purchase price liabilities. Non-qualified deferred income (loss) on investment Non Qualified Deferred Compensation Plan Gain (Loss) On Investments Non Qualified Deferred Compensation Plan Gain (Loss) On Investments Current: Current Income Tax Expense (Benefit), Continuing Operations [Abstract] Net increase in valuation allowance Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount Income taxes payable Accrued Income Taxes, Current Stock options exercised Stock Issued During Period, Value, Stock Options Exercised Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member] Range of blended interest rates Debt Instrument, Interest Rate, Effective Percentage Entity Address, Postal Zip Code Entity Address, Postal Zip Code Restatement Determination Date Restatement Determination Date Provision for income taxes Provision for income taxes Income Tax Expense (Benefit) Basis spread on variable rate Debt Instrument, Basis Spread on Variable Rate Net unrealized gain (loss) on interest rate swaps, net of income tax benefit Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Total property and equipment Property, Plant and Equipment, Gross Employer contribution Defined Contribution Plan, Employer Discretionary Contribution Amount Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Goodwill Additions Goodwill, Acquired During Period Proceeds from exercise of stock options Proceeds from Stock Options Exercised Business acquisitions and purchases of client lists, net of cash acquired Cash consideration Payments to Acquire Businesses, Net of Cash Acquired Federal Income Tax Paid, Federal, after Refund Received All Trading Arrangements All Trading Arrangements [Member] Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Contingent Purchase Price Liabilities Contingent Purchase Price Payable [Member] Contingent purchase price payable. Other, net Effective Income Tax Rate Reconciliation, Other Adjustments, Amount Outstanding at beginning of period (in shares) Outstanding at end of period (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Net cash provided by operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Redemptions Proceeds from Sale of Debt Securities, Available-for-Sale Adjusted total leverage ratio spread Adjusted Total Leverage Ratio, Spread Adjusted Total Leverage Ratio, Spread Property and equipment useful life Property, Plant and Equipment, Useful Life Revenues from External Customers and Long-Lived Assets [Line Items] Revenues from External Customers and Long-Lived Assets [Line Items] Subsequent Event Subsequent Event [Member] Other line of credit Other Line Of Credit [Member] Other Line Of Credit Other current assets Business Combination, Recognized Asset Acquired, Other Asset, Current Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] PEO Total Compensation Amount PEO Total Compensation Amount Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Depreciation expense for property and equipment Depreciation Fair value, liability Derivative Liability, Subject to Master Netting Arrangement, before Offset Assets acquired: Business Combination, Recognized Asset Acquired, Asset [Abstract] Equity Components Equity Components [Axis] Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Number of Reportable Segments Number of Reportable Segments Interest rate swaps, net Interest Rate Derivatives, at Fair Value, Net Share repurchase program, past years approved by board Share Repurchase Program, Past Years Approved By Board Share Repurchase Program, Past Years Approved By Board Entity Address, State or Province Entity Address, State or Province Total current liabilities Liabilities, Current Senior leverage ratio Senior Leverage Ratio Senior leverage ratio. Individual: Individual [Axis] Financial service Financial Service [Member] Document Annual Report Document Annual Report Adjustments, Property, and equipment Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Property, Plant, and Equipment Summary of Estimated Useful Lives Property and Equipment Property Plant And Equipment Estimated Useful Lives Table [Table Text Block] Property plant and equipment estimated useful lives. Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Entity Interactive Data Current Entity Interactive Data Current Adjusted Term Secured Overnight Financing Rate (SOFR) Adjusted Term Secured Overnight Financing Rate (SOFR) [Member] Adjusted Term Secured Overnight Financing Rate (SOFR) Deferred revenue Deferred Tax Assets, Deferred Income Adjustments, Lease liabilities (current and non-current) Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Lease Obligation Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Lease Liabilities Scenario One Scenario One [Member] Scenario One Share-based compensation Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-Based Payment Arrangement, Amount Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Net operating loss carryforwards Deferred Tax Assets, Operating Loss Carryforwards Interest Rate Swap, March 2030 Expiration Interest Rate Swap, March 2030 Expiration [Member] Interest Rate Swap, March 2030 Expiration Property, Plant and Equipment, Type [Axis] Long-Lived Tangible Asset [Axis] Goodwill Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block] Adjustments for performance results (in dollars per share) Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Adjustments For Actual Performance Results Weighted Average Grant Date Fair Value Share-based compensation arrangement by share-based payment award, equity instruments other than options, adjustments for performance results, weighted average grant Date fair value. Interest Rate Swap, August 2027 Expiration Interest Rate Swap, August 2027 Expiration [Member] Interest Rate Swap, August 2027 Expiration Other non-current assets Other Assets, Noncurrent Entity Central Index Key Entity Central Index Key PEO Name PEO Name Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member] Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Beginning balance Ending balance Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value Comprehensive income: Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] Contingent purchase price liability Business Combination, Contingent Consideration, Liability, Noncurrent Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] FINANCIAL INSTRUMENTS Financial Instruments Disclosure [Text Block] Exercise Price Award Exercise Price Entity Filer Category Entity Filer Category Performance share units (in shares) Incremental Common Shares Attributable To Performance Share Units Incremental Common Shares Attributable To Performance Share Units Class of Stock [Domain] Class of Stock [Domain] Unrecognized compensation cost for restricted stock awards Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount Tax at U.S. federal statutory rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Adjustments, Deferred income taxes, net Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Deferred Tax Assets Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Deferred Tax Assets Subsequent Event Type [Axis] Subsequent Event Type [Axis] Contingent purchase price liability Business Combination, Contingent Consideration, Liability, Current Interest Rate Swap, July 2026 Expiration Interest Rate Swap, July 14 2026 Expiration [Member] Interest Rate Swap, July 14 2026 Expiration Total long-term debt Total long-term debt Long-Term Debt, Excluding Current Maturities Balance Sheet Location [Axis] Statement of Financial Position Location, Balance [Axis] 2028 Finite-Lived Intangible Asset, Expected Amortization, Year Three Share Repurchase Program, Percentage Of Net Income Share Repurchase Program, Percentage Of Net Income Share Repurchase Program, Percentage Of Net Income Restricted stock units and awards Restricted Stock Units And Awards [Member] Restricted Stock Units And Awards Deferred tax assets: Deferred Tax Assets, Net [Abstract] Total intangibles Finite-Lived Intangible Assets, Gross Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Entity Address, Address Line One Entity Address, Address Line One Entity Address, Address Line Two Entity Address, Address Line Two Accumulated Other Comprehensive (Loss) Income AOCI Attributable to Parent [Member] Allowance for doubtful accounts Allowance for doubtful accounts Balance at beginning of period Balance at end of period Accounts Receivable, Allowance for Credit Loss, Current Meals and entertainment Effective Income Tax Rate Reconciliation, Nondeductible Expense, Meals and Entertainment, Percent Investments [Domain] Investments [Domain] Indirect repurchase of shares for minimum tax withholding (in shares) Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation Business Combination, Asset Acquisition, Transaction between Entities under Common Control, and Joint Venture Formation [Abstract] Pro forma EBITDA threshold (as a percent) Share Repurchase Program, Percentage Of Pro Forma EBITDA Threshold Share Repurchase Program, Percentage Of Pro Forma EBITDA Threshold Fair Value as of Grant Date Award Grant Date Fair Value Reserves for uncertain tax positions Effective Income Tax Rate Reconciliation, Tax Contingency, Amount Personnel costs Labor and Related Expense Organization Organization Policy [Policy Text Block] Disclosure of accounting policies for organization. Granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Purchases of client fund investments Payments to Acquire Investments Total segment expense Costs and Expenses Forfeited (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period Related Party Transaction [Line Items] Related Party Transaction [Line Items] Schedule Of Common Stock [Line Items] Schedule Of Common Stock [Line Items] Schedule Of Common Stock [Line Items] Deferred income taxes Deferred Income Taxes and Tax Credits Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] 2027 Lessee, Operating Lease, Liability, to be Paid, Year Two Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Investments, All Other Investments [Abstract] Investments, All Other Investments [Abstract] Dilutive Securities Included And Antidilutive Securities Excluded From Computation Of Earnings Per Share [Table] Dilutive Securities Included And Antidilutive Securities Excluded From Computation Of Earnings Per Share [Table] Dilutive securities included and antidilutive securities excluded from computation of earnings per share. Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Investment Type [Axis] Investment Type [Axis] Net unrealized gain (loss) on available-for-sale securities, net of income tax expense Other Comprehensive Income (Loss), Available-for-Sale Securities, Tax, Portion Attributable to Parent Title Trading Arrangement, Individual Title Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Cash payment amount Payments to Acquire Businesses, Gross Funds Held for Clients and Client Fund Obligations Funds Held For Clients And Client Fund Obligations Policy [Policy Text Block] Disclosure of accounting policies for funds held for clients and client fund obligations. Non-PEO NEO Non-PEO NEO [Member] Letters of credit outstanding Letters of Credit Outstanding, Amount Right of Use assets Deferred Tax Liabilities, Leasing Arrangements Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Notional amount, liability Derivative Liability, Notional Amount Other intangibles Other Intangible Assets [Member] Award Type [Domain] Award Type [Domain] 2026 Lessee, Operating Lease, Liability, to be Paid, Year One Equity Awards Adjustments Equity Awards Adjustments [Member] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Lease liabilities (current and non-current) Business Combination, Recognized Liability Assumed, Lease Obligation Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Canada CANADA Compensation Amount Outstanding Recovery Compensation Amount Deferred: Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract] Summary of Revenue from External Customers Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Accrued personnel costs Increase (Decrease) in Employee Related Liabilities Current assets before funds held for clients Current Assets Before Funds Held For Clients Current assets before funds held for clients. MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Statutory rate difference between Canada and U.S. Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent Deferred income taxes, net Business Combination, Recognized Asset Acquired, Deferred Tax Asset Adjustment to contingent earnout liability, net Increase (decrease) in the fair value of contingent consideration, net Business Combination, Contingent Consideration, Change in Contingent Consideration, Liability, Increase (Decrease) Documents Incorporated by Reference Documents Incorporated by Reference [Text Block] Accumulated other comprehensive (loss) income Accumulated Other Comprehensive Income (Loss), Net of Tax Gross Goodwill, Gross Cash settlement paid Payments for Previous Acquisition Total gross deferred tax liabilities Deferred Tax Liabilities, Gross Performance share units Performance Shares [Member] Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Other Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Amount Gain reclassified from AOCI into expense Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Minimum Minimum [Member] Reduction of goodwill Adjustments, Goodwill Goodwill, Measurement Period Adjustment Buildings and leasehold improvements Buildings And Leasehold Improvements [Member] Buildings and leasehold improvements. Company Selected Measure Name Company Selected Measure Name Commitments And Contingencies [Line Items] Commitments And Contingencies [Line Items] Commitments and contingencies. DEBT AND FINANCING ARRANGEMENTS Debt Disclosure [Text Block] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Accounts payable Accounts Payable, Current Operating cash flows for operating leases Operating Lease, Payments Deferred tax liabilities: Deferred Tax Liabilities, Net [Abstract] Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Net expense Business Combination Contingent Consideration Liability Other Adjustments Based On Projected Future Results Of Acquisition Business combination contingent consideration liability other adjustments based on projected future results of acquisition. Remaining number of shares issuable (in shares) Business Acquisition, Equity Interest, Remaining Number Of Shares Issuable Business Acquisition, Equity Interest, Remaining Number Of Shares Issuable Foreign Current Foreign Tax Expense (Benefit) Percentage of participating employees contribution, matched 100% (as a percent) Defined Contribution Plan Percentage Of Base Compensation Defined contribution plan percentage of base compensation. Goodwill [Roll Forward] Goodwill [Roll Forward] COMMITMENTS AND CONTINGENCIES Commitments and Contingencies Disclosure [Text Block] Diluted weighted average common shares outstanding (in shares) Diluted weighted average common shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Diluted Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Share-based compensation arrangement by share-based payment award, remaining contractual terms Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms Adjustments, Other current assets Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Other Assets, Current Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Other Assets, Current Entity Small Business Entity Small Business Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] State and local Current State and Local Tax Expense (Benefit) Adjustments, Other current liabilities Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Other Liability, Current Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Other Liability, Current Document Transition Report Document Transition Report Underlying Securities Award Underlying Securities Amount Scenario Two Scenario Two [Member] Scenario Two Equity Component Equity Component [Domain] Document Period End Date Document Period End Date Bank debt Long-term line of credit Long-Term Line of Credit, Noncurrent INCOME TAXES Income Tax Disclosure [Text Block] Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Document Type Document Type Level 3 Fair Value, Inputs, Level 3 [Member] EARNINGS PER SHARE Earnings Per Share [Text Block] Name Outstanding Recovery, Individual Name Product and Service [Axis] Product and Service [Axis] Revenue Total revenue Revenue from Contract with Customer, Excluding Assessed Tax MOVEit Customer Data Security Breach Litigation MOVEit Customer Data Security Breach Litigation [Member] MOVEit Customer Data Security Breach Litigation Total current assets Assets, Current Statistical Measurement [Axis] Statistical Measurement [Axis] Adjustments, Right-of- use asset Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Right-Of- Use Asset Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Right-Of- Use Asset Annual share repurchase limit Share Repurchase Program, Authorized, Amount Charge-offs, net of recoveries Allowance For Doubtful Accounts Receivable Write Offs And Net Of Recoveries Allowance for doubtful accounts receivable write offs and net of recoveries. Summary Of Significant Accounting Policies [Table] Summary Of Significant Accounting Policies [Table] Summary Of Significant Accounting Policies [Table] Interest rate swap, fixed interest rate Derivative, Fixed Interest Rate Number of claims filed Loss Contingency, New Claims Filed, Number Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] Fair Value Measurement Inputs and Valuation Techniques [Line Items] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Indirect repurchase of shares for minimum tax withholding Payment, Tax Withholding, Share-Based Payment Arrangement Adjusted Base Rate Adjusted Base Rate [Member] Adjusted Base Rate Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Share Repurchase Program Share Repurchase Program [Domain] Total other comprehensive loss Other comprehensive loss Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Current liabilities: Liabilities, Current [Abstract] Unallocated corporate operating expenses Operating Expenses Level 1 Fair Value, Inputs, Level 1 [Member] Account payable Business Combination, Recognized Liability Assumed, Accounts Payable, Current Related Party Transaction [Table] Related Party Transaction [Table] Diluted (in dollars per share) Earnings Per Share, Diluted Accounts receivable, net Accounts receivable, net Accounts Receivable, after Allowance for Credit Loss, Current Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Dilutive Securities Included And Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] Dilutive Securities Included And Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] Dilutive securities included and antidilutive securities excluded from computation of earnings per share. Treasury stock, shares (in shares) Treasury stock, beginning balance (in shares) Treasury stock, ending balance (in shares) Treasury Stock, Common, Shares State and local Income Tax Paid, State and Local, after Refund Received Consolidation Items [Domain] Consolidation Items [Domain] Net leverage ratio Debt Instrument, Covenant, Total Net Leverage Ratio, Maximum Debt Instrument, Covenant, Total Net Leverage Ratio, Maximum Auditor Location Auditor Location Gross margin Gross Profit Business Combination, Contingent Consideration [Line Items] Business Combination, Contingent Consideration [Line Items] Less: imputed interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount Number of defendants Loss Contingency, Number of Defendants Other Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Percent Cash paid for income taxes, net of income tax refunds Cash paid for income taxes, net of income tax refunds Income Taxes Paid, Net 2027 Finite-Lived Intangible Asset, Expected Amortization, Year Two Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Accrued personnel costs Employee-related Liabilities, Current PROPERTY AND EQUIPMENT, NET Property, Plant and Equipment Disclosure [Text Block] Total undiscounted lease payments Lessee, Operating Lease, Liability, to be Paid Other Other Interest Expense [Member] Other interest expense. Interest Rate Swap, July 2027 Expiration Interest Rate Swap, July 14, 2027 Expiration [Member] Interest Rate Swap, July 14, 2027 Expiration Expiration Date Trading Arrangement Expiration Date Other liabilities Increase (Decrease) in Other Operating Liabilities Interest Rate Swap, October 2028 Expiration Interest Rate Swap, October 2028 Expiration [Member] Interest Rate Swap, October 2028 Expiration 2030 Finite-Lived Intangible Asset, Expected Amortization, Year Five Amount of related party transaction Related Party Transaction, Amounts of Transaction Changes in client funds obligations Net Increase (Decrease) In Client Funds Obligations Net (decrease) increase in client funds obligations. Net unrealized gain on available-for-sale securities, net of income tax expense of $88, $182 and $403 Other Comprehensive Income (Loss), Available-for-Sale Securities Adjustment, Net of Tax, Portion Attributable to Parent Property and equipment, net Property and equipment, net Property, Plant and Equipment, Net Numerator: Net Income (Loss) Attributable to Parent [Abstract] Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Accounts receivable, net Increase (Decrease) in Accounts Receivable Entity Current Reporting Status Entity Current Reporting Status Receivables [Abstract] Receivables [Abstract] Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Tax at U.S. federal statutory rate Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Executive Category: Executive Category [Axis] Interest Rate Swap, April 2025 Expiration Interest Rate Swap, April 2025 Expiration [Member] Interest Rate Swap, April 2025 Expiration National Practices consulting National Practices Consulting [Member] National practices consulting. State taxes (net of federal benefit) Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent Current Fiscal Year End Date Current Fiscal Year End Date Other current liabilities Business Combination, Recognized Liability Assumed, Other Liability, Current Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Adjustments, Total identifiable assets acquired Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Assets Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Assets Summary of Accounts Receivable, Net Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Weighted Average Grant Date Fair Value Weighted Average Grant Date Fair Value Per Unit Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Share available for future grant (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Percentage of initial grant Share Based Compensation Arrangements By Share Based Payment Award Performance Stock Percentage Of Initial Grant Share based compensation arrangements by share based payment award performance stock percentage of initial grant. Summary of Assets and Liabilities Measured at Fair Value on a Recurring Basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Business acquisitions Stock Issued During Period, Value, Acquisitions Beginning Balance Ending Balance Unrecognized Tax Benefits Net asset acquired Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less) Share based awards excluded from the calculation of diluted earnings per share (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Denominator: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] LEASES Lessee, Operating Leases [Text Block] Net cash provided by (used in) financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Debt issuance costs, noncurrent Debt Issuance Costs, Noncurrent, Net Measure: Measure [Axis] Thereafter Finite-Lived Intangible Asset, Expected Amortization, after Year Five Property, Plant and Equipment, Type [Domain] Long-Lived Tangible Asset [Domain] Annual amortization rate first two years Debt Instrument, Annual Principal Amortization Payments Rate, Years One And Two Debt Instrument, Annual Principal Amortization Payments Rate, Years One And Two Incremental borrowing capacity Line Of Credit Facility, Accordion Feature, Increase Limit Line Of Credit Facility, Accordion Feature, Increase Limit Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Amortization of deferred financing fees Amortization of Debt Issuance Costs Entity Tax Identification Number Entity Tax Identification Number Performance share units Performance Share Units Performance share units. weighted average exercise price (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price Net decrease in assets acquired Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Assets Acquired Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Assets Acquired Stock options Stock or Unit Option Plan Expense Common stock, shares, issued (in shares) Common stock, beginning balance (in shares) Common stock, ending balances (in shares) Common Stock, Shares, Issued Weighted-average remaining lease term Operating Lease, Weighted Average Remaining Lease Term GOODWILL AND OTHER INTANGIBLE ASSETS, NET Goodwill and Intangible Assets Disclosure [Text Block] Holding period of stock Employee Stock Purchase Plan Holding Period Of Stock Employee stock purchase plan holding period of stock. Entity Public Float Entity Public Float Summary of Changes in Carrying Amount of Goodwill by Operating Segment Schedule of Goodwill [Table Text Block] Interest expense Interest expense Interest Expense, Nonoperating Trading Arrangement: Trading Arrangement [Axis] Income taxes payable Increase (Decrease) in Income Taxes Payable Total Shareholder Return Amount Total Shareholder Return Amount 2024 Credit Facilities 2024 Credit Facilities [Member] 2024 Credit Facilities Unsecured credit facility Unsecured Long-Term Debt, Noncurrent Change in fair value of contingency Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings Security Exchange Name Security Exchange Name Foreign Income Tax Paid, Foreign, after Refund Received Total non-current liabilities Liabilities, Noncurrent Summary of Effects of Interest Rate Swap Summary Of Effects Of Interest Rate Swaps Table [Table Text Block] Summary of effects of interest rate swaps table. Line of credit facility, maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Interest Rate Swap, December 2026 Expiration Interest Rate Swap, December 2026 Expiration [Member] Interest Rate Swap, December 2026 Expiration Other current liabilities Other Liabilities, Current Performance share units Statement [Line Items] Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Cash and cash equivalents Cash and cash equivalents Cash and Cash Equivalent Fair Value Measurement Inputs and Valuation Techniques [Table] Fair Value Measurement Inputs and Valuation Techniques [Table] Summary Of Significant Accounting Policies [Line Items] Summary Of Significant Accounting Policies [Line Items] Summary Of Significant Accounting Policies [Line Items] Subsequent Event [Line Items] Subsequent Event [Line Items] Scenario Three Scenario Three [Member] Scenario Three Covenant leverage ratio, maximum, tranche one Debt Instrument, Covenant, Leverage Ratio, Maximum, Tranche One Debt Instrument, Covenant, Leverage Ratio, Maximum, Tranche One Common Stock Common Stock [Member] Vested (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period Other Intangible Assets Goodwill and Intangible Assets, Intangible Assets, Policy [Policy Text Block] Net increase (decrease) in cash, cash equivalents and restricted cash Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Statistical Measurement [Domain] Statistical Measurement [Domain] Other current asset Other Current Assets [Member] Property and equipment Business Combination, Recognized Asset Acquired, Property, Plant, and Equipment Thereafter Lessee, Operating Lease, Liability, to be Paid, after Year Five Stock options (in shares) Incremental Common Shares Attributable To Stock Options Incremental common shares attributable to stock options. Restricted cash Restricted Cash, Current Related Party Transaction [Axis] Related Party Transaction [Axis] Amount of goodwill deductible for income tax purposes Business Combination, Goodwill, Expected Tax Deductible, Amount Tax Jurisdiction of Domicile [Extensible Enumeration] Tax Jurisdiction of Domicile [Extensible Enumeration] Other non-current asset Other Noncurrent Assets [Member] Interest rate swaps Interest rate swaps Interest Rate Swap [Member] Summary of Balance Sheet Information Related to Leases Operating Lease Liability Balance Sheet Information Table [Table Text Block] Operating lease liability balance sheet information. Fair market value adjustment Available For Sale Securities Debt Securities Fair Market Value Adjustment Available For Sale Securities Debt Securities Fair Market Value Adjustment Leases [Abstract] Leases [Abstract] Basic Earnings Per Share, Basic [Abstract] Additions for positions of prior years Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions Common stock issued (in shares) Equity interest issued or issuable (in shares) Business Combination, Consideration Transferred, Equity Interest, Share Issued, Number of Shares Client fund obligations Client Fund Obligations Client fund obligations. Accounts payable Increase (Decrease) in Accounts Payable Indirect repurchase of shares for minimum tax withholding Indirect repurchase of shares for minimum tax withholding Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation Annual amortization rate third and fourth years Debt Instrument, Annual Principal Amortization Payments Rate, Years Three And Four Debt Instrument, Annual Principal Amortization Payments Rate, Years Three And Four Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Fed Funds Effective Rate Overnight Index Swap Rate Fed Funds Effective Rate Overnight Index Swap Rate [Member] Basic (in dollars per share) Earnings Per Share, Basic Adjustments, Unbilled revenue Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Unbilled Revenue Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Unbilled Revenue Summary of Unsecured Credit Facility Schedule of Line of Credit Facilities [Table Text Block] Debt Securities, Available for Sale [Roll Forward] Debt Securities, Available For Sale [Roll Forward] Debt Securities, Available for Sale [Roll Forward] Reduction of the estimated settlement amounts associated with acquired non-current liability Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Noncurrent Liability Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Noncurrent Liability Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Reserves for uncertain tax positions Effective Income Tax Rate Reconciliation, Tax Contingency, Percent Total gross deferred tax assets Deferred Tax Assets, Gross Unbilled revenue, at net realizable value Unbilled Receivables, Current Summary of Segment Information Schedule of Segment Reporting Information, by Segment [Table Text Block] Short-term debt Short-Term Debt Fair value measurements, inter-transfers between levels Fair Value Measurements Inter Transfers Between Levels Fair value measurements inter transfers between levels. Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Certified deposits and other depository assets Certified Deposits And Other Depository Assets [Member] Certified deposits and other depository assets. Excise tax on share repurchases Share Repurchase Program, Excise Tax Accounting, tax, advisory and consulting Accounting Tax Advisory And Consulting [Member] Accounting, tax, advisory and consulting. Total share-based compensation expense Share-Based Payment Arrangement, Expense Goodwill and Intangible Assets Disclosure [Abstract] Goodwill and Intangible Assets Disclosure [Abstract] Business Combination, Goodwill, Reportable Segment Assignment [Line Items] Business Combination, Goodwill, Reportable Segment Assignment [Line Items] Current assets: Assets, Current [Abstract] Total liabilities and stockholders’ equity Liabilities and Equity Business acquisitions (in shares) Business acquisitions (in shares) Stock Issued During Period, Shares, Acquisitions Service Fee Service Fee [Member] Service Fee Number of practice groups Number Of Practice Groups Number of practice groups. Other deferred tax assets Deferred Tax Assets, Other National Practices National Practices National Practices [Member] National practices. Summary of Maturity of Operating Lease Liabilities Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block] Treasury Shares Treasury Stock, Common [Member] Total fair value of shares vested during period Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value Meals and entertainment Effective Income Tax Rate Reconciliation, Nondeductible Expense, Meals and Entertainment, Amount Pay vs Performance Disclosure [Line Items] Summary of Segment Allocation Business Combination, Goodwill, Reportable Segment Assignment [Table Text Block] Total lease liabilities Operating Lease, Liability Operating Expenses Operating Expenses Policy [Policy Text Block] Disclosure for accounting policies for operating Expenses. Foreign currency translation Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent LIABILITIES Liabilities [Abstract] BUSINESS COMBINATIONS Business Combination [Text Block] Share Repurchase Program Share Repurchase Program [Member] Share repurchase program. Period of time shares are contractually restricted from sale (up to) Business Acquisition, Equity Interest Issued Or Issuable, Period Contractually Restricted From Sale Business Acquisition, Equity Interest Issued Or Issuable, Period Contractually Restricted From Sale Other non-current liabilities Other Liabilities, Noncurrent Goodwill impairment Goodwill, Impairment Loss Core Benefits and Insurance Services Core Benefits And Insurance Services [Member] Core benefits and insurance services. Accounts Receivable and Allowance for Doubtful Accounts Accounts Receivable And Allowance For Doubtful Accounts Policy [Policy Text Block] Accounts receivable and allowance for doubtful accounts. Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Total short-term debt Total short-term debt Long-Term Debt, Current Maturities Company Selected Measure Amount Company Selected Measure Amount 2028 Lessee, Operating Lease, Liability, to be Paid, Year Three Total comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Name Measure Name Summary of Income Before Income Taxes Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block] Secured Debt Secured Debt [Member] Maturities Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-Sale Summary of Change in Level 3 Fair Values of Contingent Purchase Price Liabilities Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Deferred income taxes, net Deferred Income Tax Liabilities, Net Total assets Assets Assets 2026 Finite-Lived Intangible Asset, Expected Amortization, Year One Facility costs Facility Expense Facility Expense Vested (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Restricted Cash Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block] Geographical [Domain] Geographical [Domain] Income Taxes Income Tax, Policy [Policy Text Block] Audit Information [Abstract] Audit Information Cash flows from operating activities: Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Text Block] Other costs, gains, and losses, net Segment Reporting, Other Segment Item, Amount Weighted average useful life Acquired Finite-Lived Intangible Assets, Weighted Average Useful Life License bonds outstanding amount License Bonds Outstanding Amount License bonds outstanding. Achievement of total growth in revenue Share Based Compensation Arrangements By Share Based Payment Award Performance Stock Of Total Growth In Revenue Share based compensation arrangements by share based payment award performance stock of total growth in revenue. 2029 Finite-Lived Intangible Asset, Expected Amortization, Year Four Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Accrued personnel costs Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Current Liabilities, Accrued Personnel Costs Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Current Liabilities, Accrued Personnel Costs Debt Securities, Available-for-sale [Line Items] Debt Securities, Available-for-Sale [Line Items] Total identifiable assets acquired Business Combination, Recognized Asset Acquired, Asset Level 2 Fair Value, Inputs, Level 2 [Member] Document Financial Statement Error Correction Document Financial Statement Error Correction [Flag] State taxes (net of federal benefit) Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Business Combination [Domain] Business Combination [Domain] Maximum maturity period of investments Maximum Maturity Period Of Investments Maximum maturity period of investments. Gain on sale of operations, net Gain on sale of operations, net of tax Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal Related Party Related Party [Member] Summary of Income Tax Expense Included in Consolidated Statements of Comprehensive Income Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Allowance for doubtful accounts Deferred Tax Asset, Tax Deferred Expense, Reserve and Accrual, Accounts Receivable, Allowance for Credit Loss 2019 Plan Two Thousand Nineteen Stock Omnibus Incentive Plan [Member] Two thousand nineteen stock omnibus incentive plan. Plan Name [Axis] Plan Name [Axis] Property and Equipment Property, Plant and Equipment, Policy [Policy Text Block] PEO PEO [Member] Proceeds from the sales and maturities of client fund investments Proceeds from Sale, Maturity and Collection of Investments Unrealized gain (loss) on available for sale securities, income tax (benefit) expense Accumulated Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax Accumulated Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax United States UNITED STATES Changes in assets and liabilities, net of acquisitions and divestitures: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract] Change in valuation allowances Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount Property and equipment Deferred Tax Liabilities, Property, Plant and Equipment Retained Earnings Retained Earnings [Member] 2024 Acquisitions 2024 Acquisitions [Member] 2024 Acquisitions Goodwill, divestitures and other adjustments Divestitures and other adjustments Goodwill, Divestitures And Other Adjustments Goodwill, Divestitures And Other Adjustments Share-based Payment Arrangement [Abstract] Share-Based Payment Arrangement [Abstract] Cash, cash equivalents and restricted cash at beginning of year Cash, cash equivalents and restricted cash at end of year Cash, cash equivalents and restricted cash at end of year Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Interest expense Interest Expense [Member] Product and Service [Domain] Product and Service [Domain] Summary of Contingent Consideration Business Combination, Contingent Consideration [Table Text Block] Diluted earnings per share (in dollars per share) Income (Loss) from Continuing Operations, Per Diluted Share Current portion debt issuance costs, Term Loan Debt Issuance Costs, Current, Net Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Renewal period of share repurchase Share Repurchase Program, Period in Force Business Combination [Table] Business Combination [Table] Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Summary of Recognized Identified Assets Acquired and Liabilities Assumed Business Combination, Recognized Asset Acquired and Liability Assumed [Table Text Block] City Area Code City Area Code Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Restricted stock awards (in shares) Incremental Common Shares Attributable To Restricted Stock Awards Incremental common shares attributable to restricted stock awards. Gain (loss) from litigation settlement Gain (Loss) from Litigation Settlement Settlement of contingent purchase price payable Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements Proceeds from bank debt Proceeds from Long-Term Lines of Credit Deferred income taxes, net Deferred Tax Liabilities, Net Managed networking, hardware services Managed Networking And Hardware Services [Member] Managed networking and hardware services. Cash flows from investing activities: Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Corporate general and administrative expenses General & administrative expenses General and Administrative Expense Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Related Party Transactions [Abstract] Related Party Transactions [Abstract] Goodwill Beginning balance, Goodwill Ending balance, Goodwill Goodwill Adjustments for performance results (in shares) Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Adjustments For Performance Results Attained Share based compensation arrangement by share based payment award equity instruments other than options adjustments for performance results attained. Summary of Lease Cost and Other Lease Information Lease, Cost [Table Text Block] Federal Deferred Federal Income Tax Expense (Benefit) Unrecognized Tax Benefits [Roll Forward] Unrecognized Tax Benefits [Roll Forward] Auditor Name Auditor Name Benefits and Insurance Services Benefits and Insurance Services Benefits And Insurance Services [Member] Benefits and insurance services. Equipment Equipment Equipment [Member] Supplemental disclosures of cash flow information: Supplemental Cash Flow Information [Abstract] Par value of available-for-sale debt securities Debt Securities, Available-for-Sale, Amortized Cost Account receivable Business Combination, Recognized Asset Acquired, Receivable, Current Accumulated impairment Goodwill, Impaired, Accumulated Impairment Loss Other Performance Measure, Amount Other Performance Measure, Amount Deferred financing costs Deferred financing costs Payments of Debt Issuance Costs Related and Nonrelated Parties [Domain] Related and Nonrelated Parties [Domain] Acquisition-related costs Deferred Tax Assets Acquisition-Related Costs Deferred Tax Assets Acquisition-Related Costs Amount Income Tax Expense (Benefit), Effective Income Tax Rate Reconciliation, Amount [Abstract] Other current liability Other Current Liabilities [Member] Derivative Instrument [Axis] Derivative Instrument [Axis] Restricted cash Restricted Cash Other current assets Other Assets, Current Additional paid-in capital Additional Paid in Capital, Common Stock Net cash used in investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Price an employee pays for shares as percentage of fair market value Employee Stock Purchase Plan Purchase Price Of Shares As Percentage Of Fair Market Value Of Common Stock Employee stock purchase plan purchase price of shares as a percentage of fair market value of common stock. Adjustments, Contingent purchase price assumed (current and non-current) Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Contingent Consideration, Liability Cash paid for interest Interest Paid, Excluding Capitalized Interest, Operating Activity Document Fiscal Year Focus Document Fiscal Year Focus Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Right-of-use asset Operating Lease, Right-of-Use Asset Right of First Refusal Agreement Right Of First Refusal Agreement [Member] Right Of First Refusal Agreement Provision for income taxes Effective income tax rate Effective Income Tax Rate Reconciliation, Percent Assets of deferred compensation plan Deferred compensation plan assets Non-qualified deferred compensation plan assets Deferred Compensation Plan Assets Operating lease cost Operating Lease, Cost Plan Name [Domain] Plan Name [Domain] Compensation cost for non-vested stock options weighted average period Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Lease liabilities Deferred Tax Assets, Lease Costs Deferred tax assets lease costs. SOFR Adjustment SOFR Adjustment [Member] SOFR Adjustment Stock options exercised (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period Less: valuation allowance Deferred Tax Assets, Valuation Allowance Equity [Abstract] Equity [Abstract] Buildings Building [Member] Interest Rate Derivative Instruments Derivatives, Policy [Policy Text Block] SEGMENT DISCLOSURES Segment Reporting Disclosure [Text Block] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Federal Current Federal Tax Expense (Benefit) Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Other non-current liabilities Business Combination, Recognized Liability Assumed, Other Liability, Noncurrent Net unrealized loss on interest rate swaps, net of income tax benefit of $1,568, $287 and $952 (Loss) Gain recognized in AOCI, net of tax Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax, Parent Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Contingent purchase price assumed (current and non-current) Business Combination, Contingent Consideration, Liability ACCUMULATED OTHER COMPREHENSIVE INCOME Comprehensive Income (Loss) Note [Text Block] Stock repurchase program authorized to be repurchased (in shares) Share Repurchase Program, Authorized, Number of Shares Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Amortization of intangible assets Amortization of Intangible Assets Operating Leases Lessee, Leases [Policy Text Block] Summary of Components of Accumulated Other Comprehensive Income Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Depreciation and amortization expense Depreciation, Depletion and Amortization Schedule of Revenues from External Customers and Long-Lived Assets [Table] Schedule of Revenues from External Customers and Long-Lived Assets [Table] Adjustments, Account receivable Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Receivables, Current Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Receivables, Current Cash received from working capital adjustments in business combination Cash Received From Working Capital Adjustments In Business Combination Cash Received From Working Capital Adjustments In Business Combination Revolving Credit Facility Revolving Credit Facility [Member] Statutory rate difference between Canada and U.S. Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount Client Lists and Other Intangible Assets Customer Lists And Other Intangible Assets [Member] Customer lists and other intangible assets. Arrangement Duration Trading Arrangement Duration Adjustments, note receivable Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Receivable Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Receivable Segments [Axis] Segments [Axis] IDG Acquisition and Other Acquisitions IDG Acquisition And Other Acquisitions [Member] IDG Acquisition And Other Acquisitions Fair Value by Liability Class [Domain] Fair Value by Liability Class [Domain] Local Phone Number Local Phone Number Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Total accounts receivable Accounts Receivable, before Allowance for Credit Loss, Current Other, net Payment for (Proceeds from) Other Investing Activity Other, net Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Other Item EMPLOYEE STOCK PLANS Share-Based Payment Arrangement [Text Block] Additional shares authorized for issuance (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Additional Shares Authorized for Issuance Share-Based Compensation Arrangement by Share-Based Payment Award, Additional Shares Authorized for Issuance Other intangible assets Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Excluding Goodwill ASSETS Assets [Abstract] Credit Facility [Axis] Credit Facility [Axis] Underlying Security Market Price Change Underlying Security Market Price Change, Percent Debt Instrument [Axis] Debt Instrument [Axis] Forfeited (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value EMPLOYEE BENEFITS Retirement Benefits [Text Block] FAIR VALUE MEASUREMENTS Fair Value Disclosures [Text Block] Business Combination [Line Items] Business Combination [Line Items] Credit Facility [Domain] Credit Facility [Domain] STOCKHOLDER EQUITY Equity, Attributable to Parent [Abstract] Share repurchases Share repurchases, value Treasury Stock, Value, Acquired, Cost Method Lease liability Operating Lease, Liability, Noncurrent Entity Voluntary Filers Entity Voluntary Filers Intangibles : Intangible Assets, Net (Excluding Goodwill) [Abstract] Fair value, asset Derivative Asset, Subject to Master Netting Arrangement, before Offset Property, Plant and Equipment [Abstract] Property, Plant and Equipment [Abstract] Entity Registrant Name Entity Registrant Name Stock repurchase program duration Stock Repurchase Program, Program Duration Stock Repurchase Program, Program Duration Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Client lists Customer Lists [Member] Deferred compensation plan obligations Deferred compensation plan liabilities Non-qualified deferred compensation plan liabilities Deferred Compensation Liability, Classified, Noncurrent Interest Rate Swap, April 2030 Expiration Interest Rate Swap, April 2030 Expiration [Member] Interest Rate Swap, April 2030 Expiration Number of business units of the company Number of Operating Segments Summary of Classification Between Short-Term and Long-Term Debt Schedule of Debt [Table Text Block] Related Party [Axis] Related and Nonrelated Parties [Axis] Granted (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Other non-current liability Other Noncurrent Liabilities [Member] Restatement Determination Date: Restatement Determination Date [Axis] Restricted stock units and awards and Performance share units Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Number of reporting units Number of Reporting Units Summary of Outstanding Interest Rate Swaps Schedule of Interest Rate Derivatives [Table Text Block] Other, net Proceeds from (Payment for) Other Financing Activity Total Interest Expense, Debt Liabilities assumed: Business Combination, Recognized Liability Assumed, Liability [Abstract] Name Trading Arrangement, Individual Name Unbilled revenue Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Current Assets, Unbilled Revenue Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Current Assets, Unbilled Revenue Summary of PSU Award Activity Share-Based Payment Arrangement, Activity [Table Text Block] Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Property and equipment Deferred Tax Assets, Property, Plant and Equipment Marcum LLP Marcum LLP Acquisition [Member] Marcum LLP Acquisition Share Repurchase Program Share Repurchase Program [Axis] Common stock Business Combination, Consideration Transferred, Equity Interest Name Awards Close in Time to MNPI Disclosures, Individual Name Outstanding at beginning of period (in dollars per share) Outstanding at end of period (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] ICFR Auditor Attestation Flag ICFR Auditor Attestation Flag Percentage of matching contribution made by company, of first 6.0% of participating employees contributions (as a percent) Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay Contingent Purchase Price Liabilities Business Combinations and Other Purchase of Business Transactions, Policy [Policy Text Block] Litigation Case [Axis] Litigation Case [Axis] Liability Class [Axis] Liability Class [Axis] Auditor Firm ID Auditor Firm ID State net operating loss carryforwards Deferred Tax Assets, Operating Loss Carryforwards, State and Local Segments [Domain] Segments [Domain] Statement of Income Location, Balance [Axis] Statement of Income Location, Balance [Axis] Foreign (Canada) Income (Loss) from Continuing Operations before Income Taxes, Foreign Total non-current assets Assets, Noncurrent Available funds under credit facility Line of Credit Facility, Remaining Borrowing Capacity Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Current portion, Term Loan Line of Credit, Current Balance Sheet Location [Domain] Statement of Financial Position Location, Balance [Domain] Non-current assets: Assets, Noncurrent [Abstract] Net unrealized gain (loss) of available-for-sale securities, net of income tax expense of $102 and income tax expense of $14, respectively AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member] Accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment State tax credit carryforwards Deferred Tax Assets Tax Credit Carry Forwards State And Local Deferred Tax Assets Tax Credit Carry Forwards State And Local Revenue Recognition Revenue [Policy Text Block] Bad debt expense, net of recoveries Provision For Doubtful Accounts Net Of Recoveries Provision for doubtful accounts net of recoveries. Purchases Payments to Acquire Debt Securities, Available-for-Sale Total liabilities assumed Business Combination, Recognized Liability Assumed, Liability All Executive Categories All Executive Categories [Member] Summary of Tax Effects of Temporary Differences That Rises to Significant Portions of Deferred Tax Assets and Deferred Tax Liabilities Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Cash paid for amounts included in measurement of lease liabilities Cash Paid For Amounts Included In Measurement Of Lease Liabilities [Abstract] Cash paid for amounts included in measurement of lease liabilities. Common stock, par value $0.01 per share; shares authorized 250,000; shares issued 144,654 and 137,945; shares outstanding 54,380 and 50,198 Common Stock, Value, Issued Summary of Recognized Interest Expense Interest Expense Table [Table Text Block] Cash and non-cash interest expense related to the Convertible Notes for the periods presented. Payment of contingent consideration of acquisitions and client lists Payment Of Contingent Consideration Of Acquisitions Payment of contingent consideration for acquisitions. Intangibles Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Finite-Lived Business Combination [Axis] Business Combination [Axis] Adjustments, Total consideration transferred Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Consideration Transferred PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Diluted Earnings Per Share, Diluted [Abstract] Revenue from Contract with Customer [Abstract] Summary of Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block] Financial Services Financial Services Financial Services [Member] Financial services. Derivative Contract [Domain] Derivative Contract [Domain] All Individuals All Individuals [Member] Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Additions to property and equipment Payments to Acquire Property, Plant, and Equipment Name Forgone Recovery, Individual Name Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member] Shares issued (number) (in shares) Number Of Common Shares Issued Number of common shares issued. Adjustments, Accrued personnel costs Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Accrued Personnel Costs Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Accrued Personnel Costs Weighted average blended interest rate Debt, Weighted Average Interest Rate Business Combination, Goodwill, Reportable Segment Assignment [Table] Business Combination, Goodwill, Reportable Segment Assignment [Table] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Intangible Asset, Finite-Lived [Table] Intangible Asset, Finite-Lived [Table] Geographical [Axis] Geographical [Axis] Lessee, Lease, Description [Line Items] Lessee, Lease, Description [Line Items] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Annual aggregate revenue Business Combination, Pro Forma Information, Pro Forma Revenue Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Title of 12(b) Security Title of 12(b) Security Lessee, Lease, Description [Table] Lessee, Lease, Description [Table] Adjustments, Net asset acquired Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Excess (Less) Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Excess (Less) Total Business Combination, Aggregated Goodwill And Intangible Assets Acquired Business Combination, Aggregated Goodwill And Intangible Assets Acquired Earnings per share: Earnings Per Share [Abstract] 2030 Lessee, Operating Lease, Liability, to be Paid, Year Five Liability for penalties Unrecognized Tax Benefits, Income Tax Penalties Accrued Total other income (expense), net Nonoperating Income (Expense) Funds held for clients Funds Held for Clients Short-term Debt, Type [Axis] Short-Term Debt, Type [Axis] Share repurchases (in shares) Share repurchases (in shares) Treasury Stock, Shares, Acquired Award Timing Disclosures [Line Items] Operating lease, renewal term Lessee, Operating Lease, Renewal Term COMMON STOCK Equity [Text Block] State and local Deferred State and Local Income Tax Expense (Benefit) Current liabilities before client fund obligations Current Liabilities Before Client Fund Obligations Current liabilities before client fund obligations. Adjustments, Account payable Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Account Payable, Current Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Account Payable, Current Net income Net income Net Income (Loss) Attributable to Parent Subsequent Event [Table] Subsequent Event [Table] Non-current liabilities: Liabilities, Noncurrent [Abstract] Summary of Effective Income Tax Rate Reconciliation Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Accounts Receivable, Allowance for Credit Loss [Roll Forward] Accounts Receivable, Allowance for Credit Loss [Roll Forward] Shares vesting term Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period Other adjustments Effective Income Tax Rate Reconciliation, Other Adjustments, Percent Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Payment for acquisition of treasury stock Payments for Repurchase of Common Stock Adoption Date Trading Arrangement Adoption Date Vested (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Intrinsic Value, Amount Per Share Goodwill and other intangibles Deferred Tax Liabilities, Goodwill and Intangible Assets Operating income Operating Income (Loss) Line of Credit Credit facilities Line of Credit [Member] Retained earnings Retained Earnings (Accumulated Deficit) Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Market value of shares awarded during period Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Market Value Share based compensation arrangement by share based payment award equity instruments other than options market value. Maximum percentage of a participant's eligible compensation that a participating may elect to contribute, on a tax-deferred annually to the plan (as a percent) Defined Contribution Plan Maximum Employee Contribution Percentage Defined contribution plan maximum employee contribution percentage. Interest Rate Swap, April 2028 Expiration Interest Rate Swap, April 2028 Expiration [Member] Interest Rate Swap, April 2028 Expiration Class of Stock [Axis] Class of Stock [Axis] Net unrealized (loss) gain on interest rate swap, net of income tax benefit of $883 and income tax expense of $685, respectively Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Accumulated amortization: Finite-Lived Intangible Assets, Net [Abstract] Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table [Member] Other deferred tax liabilities Deferred Tax Liabilities, Other Reconciliation of cash, cash equivalents and restricted cash to the Consolidated Balance Sheets: Reconciliation Of Cash Cash Equivalents And Restricted Cash To Consolidated Balance Sheet [Abstract] Reconciliation of cash, cash equivalents and restricted cash to the Consolidated Balance Sheets. Statement [Table] Statement [Table] Other income, net Other income, net Other Nonoperating Income (Expense) Share-based compensation APIC, Share-Based Payment Arrangement, ESPP, Increase for Cost Recognition Total Deferred Income Tax Expense (Benefit) Adjustments to reconcile net income to net cash provided by operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] Lapse of statutes of limitation Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations Cash flows from financing activities: Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Adjustments, Other non-current liabilities Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Noncurrent Liabilities, Other Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Noncurrent Liabilities, Other Proceeds from previous acquisition Proceeds from Previous Acquisition Variable Rate [Domain] Variable Rate [Domain] Right-of- use asset Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Right-Of-Use Assets Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Right-Of-Use Assets Change in bond premium Increase Decrease In Bond Premium Increase (Decrease) in bond premium. All Adjustments to Compensation All Adjustments to Compensation [Member] Amendment Flag Amendment Flag Treasury stock, 90,274 and 87,747 shares Treasury Stock, Common, Value Termination Date Trading Arrangement Termination Date Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Number of interest rate swaps held Number of Interest Rate Derivatives Held Long-term debt Long-Term Debt, Excluding Current Maturities [Abstract] Change in funds held for clients Increase (Decrease) In Funds Held For Clients Classified As Investing Activities Increase (Decrease) In Funds Held For Clients Classified As Investing Activities Weighted-average discount rate Operating Lease, Weighted Average Discount Rate, Percent Basic weighted average common shares outstanding (in shares) Weighted average common shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Basic Unrecognized tax benefits that would impact effective tax rate Unrecognized Tax Benefits that Would Impact Effective Tax Rate Summary of Computation of Basic and Diluted Earnings Per Share from Continuing Operations Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Related Party Transaction [Domain] Related Party Transaction [Domain] Subsequent Events [Abstract] Subsequent Events [Abstract] Segment Reporting [Abstract] Segment Reporting [Abstract] Operating expenses Cost of Revenue Debt Disclosure [Abstract] Debt Disclosure [Abstract] Other income (expense): Corporate & other: Nonoperating Income (Expense) [Abstract] Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount ESPP allows qualified employees to purchase shares of common stock Employee Stock Purchase Plan Share Purchase Authorized Amount Employee stock purchase plan share purchase maximum authorized amount per employee per year. Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Common stock, par or stated value (in dollars per share) Common Stock, Par or Stated Value Per Share Employee benefits and compensation Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Benefits Granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross Covenant interest coverage ratio, minimum Debt Instrument, Covenant, Interest Coverage Ratio, Minimum Debt Instrument, Covenant, Interest Coverage Ratio, Minimum Corporate And Eliminations Corporate And Eliminations [Member] Corporate And Eliminations Use of Estimates Use of Estimates, Policy [Policy Text Block] SUBSEQUENT EVENTS Subsequent Events [Text Block] Insider Trading Arrangements [Line Items] Number of Shares Performance Share Units Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward] Covenant leverage ratio, maximum, tranche two Debt Instrument, Covenant, Leverage Ratio, Maximum, Tranche Two Debt Instrument, Covenant, Leverage Ratio, Maximum, Tranche Two Total liabilities Liabilities Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Other income (expense), net Other Nonoperating Income (Expense) [Member] Non-core Benefits and Insurance Services Non Core Benefits And Insurance Services [Member] Non core benefits and insurance services. Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Additions for tax positions of the current year Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Consolidation Items [Axis] Consolidation Items [Axis] Variable Rate [Axis] Variable Rate [Axis] Change in net present value of contingency Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Change In Net Present Value Of Contingencies Fair value measurement with unobservable inputs reconciliation recurring basis liability change in net present value of contingencies. Summary of Restricted Stock Award Activity Share-Based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block] Fair value at beginning of period Fair value at end of period Available-for-sale debt securities Debt Securities, Available-for-Sale Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Non-NEOs Non-NEOs [Member]