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Goodwill and Other Intangible Assets, Net - Components of Goodwill and Other Intangible Assets, Net (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]    
Goodwill $ 416,139 $ 384,697
Intangible assets:    
Total intangible assets 156,739 140,593
Total goodwill and intangibles assets 572,878 525,290
Accumulated amortization:    
Total accumulated amortization (67,245) (56,207)
Goodwill and other intangible assets, net 505,633 469,083
Client Lists [Member]
    
Intangible assets:    
Total intangible assets 144,243 132,637
Accumulated amortization:    
Total accumulated amortization (61,119) (51,016)
Other Intangible Assets [Member]
    
Intangible assets:    
Total intangible assets 12,496 7,956
Accumulated amortization:    
Total accumulated amortization $ (6,126) $ (5,191)