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Goodwill and Other Intangible Assets, Net - Components of Goodwill and Other Intangible Assets, Net (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |
Goodwill | $ 560,712 | $ 528,424
Intangible assets: |  |
Total intangible assets | 189,688 | 185,988
Total goodwill and intangibles assets | 750,400 | 714,412
Accumulated amortization: |  |
Total accumulated amortization | (114,198) | (101,206)
Goodwill and other intangible assets, net | 636,202 | 613,206
Client Lists [Member] |  |
Intangible assets: |  |
Total intangible assets | 180,320 | 177,221
Accumulated amortization: |  |
Total accumulated amortization | (109,105) | (97,063)
Other Intangible Assets [Member] |  |
Intangible assets: |  |
Total intangible assets | 9,368 | 8,767
Accumulated amortization: |  |
Total accumulated amortization | $ (5,093) | $ (4,143)

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