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v3.19.3.a.u2

Description of Business and Summary of Significant Accounting Policies (Detail) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 USD ($) segment | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Aug. 20, 2018 USD ($)
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Number of reportable business segments | segment | 5 |  |  |
Advertising costs | $ 18,600,000 | $ 15,500,000 | $ 14,800,000 |
Provision for doubtful accounts | $ 19,602,000 | $ 17,872,000 | $ 15,386,000 |
Forgivable loans, forgiveness period, minimum | 1 year |  |  |
Forgivable loans, forgiveness period, maximum | 10 years |  |  |
Definite-lived intangible assets amortization period | 13 years 4 months 24 days |  |  |
Renewal term | 7 years |  |  |
Minimum |  |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Definite-lived intangible assets amortization period | 3 years |  |  |
Renewal term | 6 months |  |  |
Maximum |  |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Definite-lived intangible assets amortization period | 15 years |  |  |
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) | 3 years |  |  |
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 | 34.00% |  |  |
Senior Notes | Convertible Note Due 2023 |  |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Interest rate (as a percent) |  |  |  | 2.00%
Principal amount |  |  |  | $ 316,300,000

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