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Goodwill and Other Intangible Assets, Net - Components of Goodwill and Other Intangible Assets, Net (Detail) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]    
Goodwill $ 474,095 $ 447,685
Intangible assets:    
Total intangible assets 173,654 154,683
Total goodwill and intangibles assets 647,749 602,368
Accumulated amortization:    
Total accumulated amortization (74,727) (66,715)
Goodwill and other intangible assets, net 573,022 535,653
Client Lists [Member]    
Intangible assets:    
Total intangible assets 165,882 147,706
Accumulated amortization:    
Total accumulated amortization (72,505) (65,037)
Other Intangible Assets [Member]    
Intangible assets:    
Total intangible assets 7,772 6,977
Accumulated amortization:    
Total accumulated amortization $ (2,222) $ (1,678)