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Goodwill and Other Intangible Assets, Net - Components of Goodwill and Other Intangible Assets, Net (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]      
Goodwill $ 528,424 $ 487,484 $ 447,685
Intangible assets:      
Total intangible assets 185,988 180,337  
Total goodwill and other intangibles assets 714,412 667,821  
Accumulated amortization:      
Total accumulated amortization (101,206) (83,420)  
Goodwill and other intangible assets, net 613,206 584,401  
Client Lists [Member]      
Intangible assets:      
Total intangible assets 177,221 172,343  
Accumulated amortization:      
Total accumulated amortization (97,063) (80,560)  
Other Intangible Assets [Member]      
Intangible assets:      
Total intangible assets 8,767 7,994  
Accumulated amortization:      
Total accumulated amortization $ (4,143) $ (2,860)