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Goodwill and Other Intangible Assets, Net - Components of Goodwill and Other Intangible Assets, Net (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]      
Goodwill $ 447,685 $ 435,231 $ 384,697
Intangible assets:      
Total intangible assets 154,683 146,669  
Total goodwill and intangibles assets 602,368 581,900  
Accumulated amortization:      
Total accumulated amortization (66,715) (55,438)  
Goodwill and other intangible assets, net 535,653 526,462  
Client Lists [Member]      
Intangible assets:      
Total intangible assets 147,706 140,187  
Accumulated amortization:      
Total accumulated amortization (65,037) (54,213)  
Other Intangible Assets [Member]      
Intangible assets:      
Total intangible assets 6,977 6,482  
Accumulated amortization:      
Total accumulated amortization $ (1,678) $ (1,225)