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Goodwill and Other Intangible Assets, Net - Components of Goodwill and Other Intangible Assets, Net (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]    
Goodwill $ 527,171 $ 487,484
Intangible assets:    
Total intangible assets 184,869 180,337
Total goodwill and intangibles assets 712,040 667,821
Accumulated amortization:    
Total accumulated amortization (96,724) (83,420)
Goodwill and other intangible assets, net 615,316 584,401
Client Lists [Member]    
Intangible assets:    
Total intangible assets 176,161 172,343
Accumulated amortization:    
Total accumulated amortization (92,900) (80,560)
Other Intangible Assets [Member]    
Intangible assets:    
Total intangible assets 8,708 7,994
Accumulated amortization:    
Total accumulated amortization $ (3,824) $ (2,860)