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Basis of Presentation and Significant Accounting Policies - Additional Information (Detail) $ in Thousands |  |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Nov. 01, 2019 Reporting_Unit | Jan. 02, 2019 | Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2019 USD ($) Practice_Groups Reporting_Unit | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Jan. 01, 2019 USD ($) | Dec. 31, 2016 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of practice groups | Practice_Groups |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |
Revenue |  |  | $ 203,138 | $ 239,790 | $ 235,498 | $ 269,998 | $ 199,023 | $ 224,249 | $ 232,641 | $ 266,090 | $ 948,424 | $ 922,003 | $ 855,340 |  |
Maximum maturity period of investments |  |  |  |  |  |  |  |  |  |  | 3 months |  |  |  |
Allowance for doubtful accounts |  |  | 14,379 |  |  |  | 13,389 |  |  |  | $ 14,379 | 13,389 | 13,827 |  | $ 13,508
Software purchased or developed, estimated useful life |  |  |  |  |  |  |  |  |  |  | 7 years |  |  |  |
Goodwill |  |  | 588,213 |  |  |  | 564,300 |  |  |  | $ 588,213 | 564,300 | 528,424 |  |
Total assets |  |  | 1,400,774 |  |  |  | 1,183,031 |  |  |  | 1,400,774 | 1,183,031 |  |  |
Total stockholders' equity |  |  | 659,238 |  |  |  | $ 593,663 |  |  |  | $ 659,238 | 593,663 | 530,879 |  | $ 480,021
Intangible assets amortization period |  |  |  |  |  |  |  |  |  |  | 6 years 6 months |  |  |  |
Number of reporting units | Reporting_Unit | 5 |  |  |  |  |  |  |  |  |  | 5 |  |  |  |
Net changes in the fair value of contingent consideration |  |  |  |  |  |  |  |  |  |  | $ (1,599) | (2,617) | 1,494 |  |
Unsecured credit facility |  |  | $ 400,000 |  |  |  |  |  |  |  | 400,000 |  |  |  |
Operating lease, Percentage of office facilities |  | 96.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification between AOCI and retained earnings |  |  |  |  |  |  |  |  |  |  |  |  | 2,091 |  |
ASU 2018-02 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification between AOCI and retained earnings |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 100 |
Other Expense [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net changes in the fair value of contingent consideration |  |  |  |  |  |  |  |  |  |  | $ (1,600) | (2,600) |  |  |
Other Income [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net changes in the fair value of contingent consideration |  |  |  |  |  |  |  |  |  |  |  |  | 1,500 |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares vesting term |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |
Intangible assets amortization period |  |  |  |  |  |  |  |  |  |  | 2 years |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares vesting term |  |  |  |  |  |  |  |  |  |  | 4 years |  |  |  |
Intangible assets amortization period |  |  |  |  |  |  |  |  |  |  | 15 years |  |  |  |
Financial Service [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  | $ 157,600 | $ 154,000 | $ 156,400 |  |

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