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Deferred compensation and other liabilities 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 Number of operating industries Number of Operating Industries Number of Operating Industries Depreciation and amortization Depreciation, Depletion and Amortization 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] 2024 Finite-Lived Intangible Asset, Expected Amortization, Year Three Proceeds from bank borrowings Proceeds from Long-term Lines of Credit Unrealized gain (loss) on cash flow hedges: Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, before Tax [Abstract] 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] Tax (Expense) Benefit Other Comprehensive Income (Loss), Tax [Abstract] Net unrealized gain (loss) 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 Period, Shares, Restricted Stock Award, Net of Forfeitures Number of reporting units Number of Reporting Units Entity Central Index Key Entity Central Index Key Unrealized loss on investment, net of tax Unrealized gain (loss) on investment OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment and Tax Other operating expenses Other Selling, General and Administrative Expense Customer relationships Customer Relationships [Member] Property and equipment, net Property, Plant and Equipment, Net Tax (Expense) Benefit Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent, Parenthetical Disclosures [Abstract] Summary of Carrying Amounts of Debt Schedule of Long-term Debt Instruments [Table Text Block] Schedule of Future Amortization Expense Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Change in fair value Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) Debt Instrument [Line Items] Debt Instrument [Line Items] Repayments of bank borrowings Repayments of Long-term Debt Trading 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 Senior secured credit facility Senior Secured Credit Facility [Member] Senior Secured Credit Facility [Member] Revolving credit facility Line of Credit Facility, Current Borrowing Capacity 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, net of current portion Long-term Debt, Excluding Current Maturities Liabilities: Liabilities, Fair Value Disclosure [Abstract] Aircraft Security Agreement Aircraft Security Agreement [Member] Aircraft Security Agreement 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. 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Preferred Stock Preferred Stock [Member] Goodwill Goodwill, net beginning balance Goodwill, net ending balance Goodwill Reclassification adjustments into earnings Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax Price volatility Measurement Input, Price Volatility [Member] Scenario [Domain] Scenario [Domain] 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 Education Education [Member] Education [Member] Schedule of Finite-Lived Intangible Assets [Table] Schedule of Finite-Lived Intangible Assets [Table]