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Goodwill and Other Intangible Assets, Net - Components of Goodwill and Other Intangible Assets, Net (Detail) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
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Finite-Lived Intangible Assets [Line Items] |  |
Goodwill | $ 566,009 | $ 564,300
Intangible assets: |  |
Total intangible assets | 191,634 | 191,011
Total goodwill and intangibles assets | 757,643 | 755,311
Accumulated amortization: |  |
Total accumulated amortization | (121,762) | (118,302)
Goodwill and other intangible assets, net | 635,881 | 637,009
Client Lists [Member] |  |
Intangible assets: |  |
Total intangible assets | 182,184 | 181,564
Accumulated amortization: |  |
Total accumulated amortization | (116,103) | (112,905)
Other Intangible Assets [Member] |  |
Intangible assets: |  |
Total intangible assets | 9,450 | 9,447
Accumulated amortization: |  |
Total accumulated amortization | $ (5,659) | $ (5,397)

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