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Goodwill and Other Intangible Assets, Net - Components of Goodwill and Other Intangible Assets, Net (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]    
Goodwill $ 441,316 $ 435,231
Intangible assets:    
Total intangible assets 153,159 146,669
Total goodwill and intangibles assets 594,475 581,900
Accumulated amortization:    
Total accumulated amortization (66,302) (55,438)
Goodwill and other intangible assets, net 528,173 526,462
Client Lists [Member]    
Intangible assets:    
Total intangible assets 146,009 140,187
Accumulated amortization:    
Total accumulated amortization (64,475) (54,213)
Other Intangible Assets [Member]    
Intangible assets:    
Total intangible assets 7,150 6,482
Accumulated amortization:    
Total accumulated amortization $ (1,827) $ (1,225)