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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
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]      
Goodwill $ 384,697 $ 375,122 $ 317,434
Intangibles:      
Total intangibles 140,593 143,488  
Total goodwill and other intangibles assets 525,290 518,610  
Accumulated amortization:      
Total accumulated amortization (56,207) (49,039)  
Goodwill and other intangible assets, net 469,083 469,571  
Client lists [Member]
      
Intangibles:      
Total intangibles 132,637 134,987  
Accumulated amortization:      
Total accumulated amortization (51,016) (44,293)  
Other intangibles [Member]
      
Intangibles:      
Total intangibles 7,956 8,501  
Accumulated amortization:      
Total accumulated amortization (5,191) (4,746)  
Indefinite-lived Intangible Assets [Member]
      
Finite-Lived Intangible Assets [Line Items]      
Goodwill $ 384,697 $ 375,122