Share repurchase authorized amount Stock Repurchase Program, Authorized Amount Supplemental disclosure of cash flow information: Supplemental Cash Flow Information [Abstract] Available-for-Sale Investment AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member] Earnings Per Share Earnings Per Share, Policy [Policy Text Block] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Net income Net income (loss) Net income Net Income (Loss) Attributable to Parent Operating lease right-of-use assets Operating Lease, Right-of-Use Asset Accrued payroll and related benefits Employee-related Liabilities, Current Accumulated Amortization Finite-Lived Intangible Assets, Accumulated Amortization Statistical Measurement [Domain] Statistical Measurement [Domain] Increase (decrease) in contract asset Increase (Decrease) in Contract with Customer, Asset Segment Information Segment Reporting, Policy [Policy Text Block] Security Exchange Name Security Exchange Name Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Proceeds from sale of property and equipment Proceeds from Sale of Property, Plant, and Equipment Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] Deferred payments on business acquisition Payment for Contingent Consideration Liability, Financing Activities Additional paid-in capital Additional Paid in Capital, Common Stock Restructuring Type [Axis] Restructuring Type [Axis] Commitments, Contingencies and Guarantees Commitments Contingencies and Guarantees [Text Block] Other non-current assets Other Assets, Noncurrent Other comprehensive income (loss) Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent Segments [Axis] Segments [Axis] Derivative Instruments and Hedging Activity Derivatives, Policy [Policy Text Block] Net increase (decrease) in cash and cash equivalents Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Entity File Number Entity File Number Share-based compensation APIC, Share-based Payment Arrangement, Increase for Cost Recognition Change in fair value Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings Fair Value Disclosures - Convertible Debt Investment Reconciliation [Abstract] Fair Value Disclosures - Convertible Debt Investment Reconciliation [Abstract] Fair Value Disclosures - Convertible Debt Investment Reconciliation [Abstract] Amortization expense Amortization of Intangible Assets Schedule of Restructuring Reserve by Type of Cost Schedule of Restructuring Reserve by Type of Cost [Table Text Block] Remaining authorized repurchase amount Stock Repurchase Program, Remaining Authorized Repurchase Amount Antidilutive securities (shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Revenue recognized Contract with Customer, Liability, Revenue Recognized Underlying Asset Class [Axis] Underlying Asset Class [Axis] Liability Class [Axis] Liability Class [Axis] Unrealized gain (loss) on investment OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment, Tax Share Repurchase Program [Domain] Share Repurchase Program [Domain] Local Phone Number Local Phone Number Assets Assets [Abstract] Reimbursable expenses Reimbursable Expense Reimbursable Expense Accelerated Amortization Accelerated Amortization [Member] Accelerated Amortization Accumulated impairment losses Goodwill, Impaired, Accumulated Impairment Loss Derivative Instruments and Hedging Activity Derivative Instruments and Hedging Activities Disclosure [Text Block] Segment reconciling items Segment Reconciling Items [Member] Decrease in unrecognized tax benefits is reasonably possible Decrease in Unrecognized Tax Benefits is Reasonably Possible New Accounting Pronouncements or Change in Accounting Principle [Line Items] New Accounting Pronouncements or Change in Accounting Principle [Line Items] Goodwill and Intangible Assets Goodwill and Intangible Assets Disclosure [Text Block] New Accounting Pronouncements or Change in Accounting Principle [Table] Accounting Standards Update and Change in Accounting Principle [Table] Trade names Trade Names [Member] Retained Earnings Retained Earnings [Member] Non-current liabilities: Liabilities, Noncurrent [Abstract] Foreign currency translation adjustments Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Tax Amount of tax expense (benefit) related to, after reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature. 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Schedule of Restructuring and Related Costs [Table] Schedule of Restructuring and Related Costs [Table] Comprehensive income Comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Intangible assets, net Intangible Assets, Net (Excluding Goodwill) Employee Costs Employee Severance [Member] Investments Investment, Policy [Policy Text Block] Net cash provided by financing activities Net Cash Provided by (Used in) Financing Activities Treasury stock, at cost, 2,842,144 and 2,711,712 shares, respectively Treasury Stock, Value Weighted average shares used in calculating earnings per share: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Deferred income taxes, net Deferred Income Tax Liabilities, Net Total Assets Other Noncurrent Liabilities [Member] Components of Other Comprehensive Income (Loss), Net of Tax Comprehensive Income (Loss) [Table Text Block] Settlement of repurchase of shares (in shares) StockPurchaseInitiatedbutnotyetSettledShares StockPurchaseInitiatedbutnotyetSettledShares Fair Value of Financial Instruments Fair Value Disclosures [Text Block] Restructuring charges Total operating expenses Restructuring Charges Accounts payable Accounts Payable, Current Impairment, Long-Lived Asset, Held-for-Use Impairment, Long-Lived Asset, Held-for-Use Depreciation and amortization Depreciation, Depletion and Amortization Interest rate swap agreement, end date Derivative, Maturity Date Derivative Instruments and Hedging Activities Disclosures [Table] Derivative Instruments and Hedging Activities Disclosures [Table] 2025 Finite-Lived Intangible Asset, Expected Amortization, Year Three Financial Assets and Liabilities Measured at Fair Value on Recurring Basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Proceeds from bank borrowings Proceeds from Long-term Lines of Credit Performance Obligation Satisfied in Prior Period [Domain] Performance Obligation Satisfied in Prior Period [Domain] [Domain] for Performance Obligation Satisfied in Prior Period [Axis] Accumulated Other Comprehensive Income AOCI Attributable to Parent [Member] Contract asset after allowance for credit loss Contract with Customer, Asset, after Allowance for Credit Loss Shorelight Holdings LLC Shorelight Holdings Llc [Member] Shorelight Holdings Llc [Member] Restructuring Charges [Abstract] Restructuring Charges [Abstract] Long-term investments Long-term Investments Financial Instruments [Domain] Financial Instruments [Domain] Net unrealized gain (loss) on interest rate swaps Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, before Tax Revenues and reimbursable expenses: Revenues [Abstract] Commercial: Commercial [Member] Commercial Restructuring and Related Activities [Abstract] Restructuring and Related Activities [Abstract] Document Period End Date Document Period End Date Restricted stock awards, net of cancellations (shares) Stock Issued During 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Symbol Trading Symbol Earnings per share: Earnings Per Share [Abstract] Related Party Transaction [Domain] Related Party Transaction [Domain] (Increase) decrease in other assets Increase (Decrease) in Other Operating Assets Total revenues and reimbursable expenses Revenues Revolving credit facility Line of Credit Facility, Current Borrowing Capacity Payment to Acquire Life Insurance Policy, Investing Activities Payment to Acquire Life Insurance Policy, Investing Activities Foreign exchange forward contracts Foreign Exchange Contract [Member] Actual consolidated leverage ratio Debt Instrument, Covenant, Actual Consolidated Leverage Ratio Debt Instrument, Covenant, Actual Consolidated Leverage Ratio Goodwill Goodwill, Gross Change in fair value Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, Tax Long-term debt Long-term Debt, Excluding Current Maturities Liabilities: Liabilities, Fair Value Disclosure [Abstract] Schedule of Goodwill [Table] Schedule of Goodwill [Table] Non-cash lease expense Noncash Operating Lease Expense Portion of straight-line operating lease expense allocated to the amortization of the operating lease right of use assets. Convertible debt investment Convertible Debt Securities Convertible Debt Securities [Member] Entity Current Reporting Status Entity Current Reporting Status Effective income tax rate (as a percent) Effective Income Tax Rate Reconciliation, Percent Gain on sale of property, plant and equipment Gain (Loss) on Disposition of Property Plant Equipment Cash and cash equivalents at beginning of the period Cash and cash equivalents at end of the period Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Beginning balance (shares) Shares, Issued Shares, Issued Common stock, par value (USD per share) Common Stock, Par or Stated Value Per Share Discount rate Measurement Input, Discount Rate [Member] Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Current assets: Assets, Current [Abstract] Gross Carrying Amount Finite-Lived Intangible Assets, Gross Interest expense, net of interest income Interest Income (Expense), Nonoperating, Net Intangible assets Finite-Lived Intangible Assets, Net [Abstract] Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Underlying Asset Class [Domain] Underlying Asset Class [Domain] Exercise of stock options (shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Diluted (shares) Weighted average common shares outstanding - diluted (shares) Weighted Average Number of Shares Outstanding, Diluted Fair value, measurements, recurring Fair Value, Recurring [Member] Income Taxes Income Tax Disclosure [Text Block] Related Party [Domain] Related Party [Domain] Intangible Assets Schedule of Acquired Finite-Lived Intangible Assets by Major Class [Table Text Block] Interest rate on borrowings (as a percent) Debt Instrument, Basis Spread on Variable Rate 2027 Finite-Lived Intangible Asset, Expected Amortization, Year Five Text Block [Abstract] Fair Value of Financial Instruments Fair Value of Financial Instruments, Policy [Policy Text Block] Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Other income (expense), net: Nonoperating Income (Expense) [Abstract] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Entity Address, Address Line One Entity Address, Address Line One Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Disaggregation of Revenue [Abstract] Disaggregation of Revenue [Abstract] Changes in operating assets and liabilities, net of acquisitions and divestiture: Increase (Decrease) in Operating Capital [Abstract] Commitments And Contingencies [Table] Commitments And Contingencies [Table] Commitments And Contingencies [Table] Cash flows from operating activities: Net Cash Provided by (Used in) Operating Activities [Abstract] Entity Shell Company Entity Shell Company Derivative Instruments and Hedging Activities Disclosures [Line Items] Derivative Instruments and Hedging Activities Disclosures [Line Items] Total current liabilities Liabilities, Current Shares redeemed for employee tax withholdings Payment, Tax Withholding, Share-based Payment Arrangement Reclassification adjustments into earnings Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax Maximum principle amount Line of Credit Facility, Maximum Borrowing Capacity Revenues Revenue from Contract with Customer, Including Assessed Tax Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Current Fiscal Year End Date Current Fiscal Year End Date Equity Securities without Readily Determinable Fair Value Equity Securities without Readily Determinable Fair Value [Policy Text Block] Foreign Currency Cash Flow Hedge Derivative at Fair Value, Net Foreign Currency Cash Flow Hedge Liability at Fair Value Statement [Table] Statement [Table] Interest rate swaps Prepaid Expenses and Other Current Assets [Member] 2020 Share repurchase program Share Repurchase Program [Member] Share Repurchase Program [Member] Direct costs (exclusive of depreciation and amortization included below) Cost of Goods and Service, Excluding Depreciation, Depletion, and Amortization Statistical Measurement [Axis] Statistical Measurement [Axis] (Increase) decrease in unbilled services, net Increase (Decrease) in Other Receivables Cash Flow Hedge Derivative Instrument Assets at Fair Value Cash Flow Hedge Derivative Instrument Assets at Fair Value Option to increase revolving credit facility Optional Increase In Revolver Optional increase in revolver. Preferred Stock Preferred Stock [Member] Goodwill Goodwill Reclassification adjustments into earnings Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax Price volatility Measurement Input, Price Volatility [Member] Changes in Carrying Amount of Goodwill Schedule of Goodwill [Table Text Block] Description of Business Nature of Operations [Text Block] Adjustments to reconcile net income to cash flows from operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Transaction Expenses Transaction Expenses [Member] Transaction Expenses Cumulative unrealized gains Equity Securities without Readily Determinable Fair Value, Upward Price Adjustment, Cumulative Amount Percentage of other equity interests in foreign subsidiaries Percentage Of Pledged Voting Stock In Foreign Subsidiaries Entitled to Vote The percentage of pledged voting stock or other equity instruments in the foreign subsidiaries entitled to vote to secure the revolver and term loan. Education Education [Member] Education [Member] Schedule of Finite-Lived Intangible Assets [Table] Schedule of Finite-Lived Intangible Assets [Table]