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Description of Business and Summary of Significant Accounting Policies (Details) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 USD ($) segment optionToExtend | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Oct. 26, 2020 | Aug. 20, 2018
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Number of reportable business segments | segment | 5 |  |  |  |
Advertising costs | $ 15,200 | $ 18,600 | $ 15,500 |  |
Billed receivables | (513,459) | (482,333) |  |  |
Unbilled receivables | (236,285) | (246,205) |  |  |
Allowance for expected credit losses | $ (38,387) | $ (35,166) |  |  |
Forgivable loans, forgiveness period, minimum | 1 year |  |  |  |
Forgivable loans, forgiveness period, maximum | 10 years |  |  |  |
Definite-lived intangible assets amortization period | 13 years |  |  |  |
Number of option to extend | optionToExtend | 1 |  |  |  |
Lessee renewal term |  |  |  | 5 years |
Revision of Prior Period, Reclassification, Adjustment [Member] |  |  |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Billed receivables | $ 58,300 |  |  |  |
Unbilled receivables | 172,100 |  |  |  |
Allowance for expected credit losses | $ 230,300 |  |  |  |
Minimum |  |  |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Definite-lived intangible assets amortization period | 2 years |  |  |  |
Maximum |  |  |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Definite-lived intangible assets amortization period | 15 years |  |  |  |
Lessee renewal term | 7 years |  |  |  |
Furniture, Equipment, And Internal-Use Software | Minimum |  |  |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Estimated useful of furniture, equipment and internal use software (in years) | 1 year |  |  |  |
Furniture, Equipment, And Internal-Use Software | Maximum |  |  |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Estimated useful of furniture, equipment and internal use software (in years) | 7 years |  |  |  |
Software and Software Development Costs |  |  |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Estimated useful of furniture, equipment and internal use software (in years) | 3 years |  |  |  |
Geographic Concentration Risk | Consolidated Revenues | Non U.S |  |  |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Revenue from the work of professionals | 37.00% |  |  |  |
Senior Notes | Convertible Note Due 2023 |  |  |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Interest rate (as a percent) | 2.00% |  |  |  | 2.00%

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