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Goodwill and Other Intangible Assets, Net - Components of Goodwill and Other Intangible Assets, Net (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |  |
Goodwill | $ 588,213 | $ 564,300 | $ 528,424
Intangible assets: |  |  |
Total intangible assets | 198,780 | 191,011 |
Total goodwill and other intangibles assets | 786,993 | 755,311 |
Accumulated amortization: |  |  |
Total accumulated amortization | (132,322) | (118,302) |
Goodwill and other intangible assets, net | 654,671 | 637,009 |
Client Lists [Member] |  |  |
Intangible assets: |  |  |
Total intangible assets | 188,898 | 181,564 |
Accumulated amortization: |  |  |
Total accumulated amortization | (125,887) | (112,905) |
Other Intangible Assets [Member] |  |  |
Intangible assets: |  |  |
Total intangible assets | 9,882 | 9,447 |
Accumulated amortization: |  |  |
Total accumulated amortization | $ (6,435) | $ (5,397) |

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