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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
Jun. 30, 2013
Dec. 31, 2012
Intangible assets:    
Total intangibles assets $ 144,596 $ 143,488
Total goodwill and intangibles assets 528,522 520,036
Accumulated amortization:    
Total accumulated amortization (53,541) (49,039)
Goodwill and other intangible assets, net 474,981 470,997
Client Lists [Member]
    
Intangible assets:    
Total intangibles assets 136,303 134,987
Accumulated amortization:    
Total accumulated amortization (48,576) (44,293)
Other Intangible Assets [Member]
    
Intangible assets:    
Total intangibles assets 8,293 8,501
Accumulated amortization:    
Total accumulated amortization (4,965) (4,746)
Indefinite-lived Intangible Assets [Member]
    
Finite-Lived Intangible Assets [Line Items]    
Goodwill $ 383,926 $ 376,548