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Basis of Presentation and Significant Accounting Policies - Additional Information (Detail) $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Nov. 01, 2018 Reporting_Unit | Dec. 31, 2018 USD ($) Practice_Groups Reporting_Unit | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Number of practice groups | Practice_Groups |  | 3 |  |  |
Revenue |  | $ 922,003 | $ 855,340 | $ 799,832 |
Shares vesting term |  | 4 years |  |  |
Maximum maturity period of investments |  | 3 months |  |  |
Allowance for doubtful accounts |  | $ 13,389 | 13,827 | 13,508 | $ 12,659
Software purchased or developed, estimated useful life |  | 7 years |  |  |
Goodwill |  | $ 564,300 | 528,424 | 487,484 |
Total assets |  | 1,183,031 | 1,176,231 |  |
Total stockholders' equity |  | $ 593,663 | 530,879 | 480,021 | $ 427,948
Intangible assets amortization period |  | 6 years 9 months 18 days |  |  |
Number of reporting units | Reporting_Unit | 5 | 5 |  |  |
Net changes in the fair value of contingent consideration |  | $ (2,617) | 1,494 | 994 |
Unsecured credit facility |  | 400,000 |  |  |
Other Expense |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Net changes in the fair value of contingent consideration |  | $ (2,600) |  |  |
Other Income |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Net changes in the fair value of contingent consideration |  |  | 1,500 | 1,000 |
Minimum [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Intangible assets amortization period |  | 2 years |  |  |
Maximum [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Intangible assets amortization period |  | 15 years |  |  |
Financial Service [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Revenue |  | $ 154,000 | $ 156,400 | $ 144,800 |

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