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Goodwill and Other Intangible Assets, Net - Changes in Carrying Amount of Goodwill by Operating Segment (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]    
Goodwill $ 375,122 $ 317,434
Additions 9,575 57,688
Goodwill 384,697 375,122
Financial Services [Member]
    
Finite-Lived Intangible Assets [Line Items]    
Goodwill 259,038 233,163
Additions 1,677 25,875
Goodwill 260,715 259,038
Employee Services [Member]
    
Finite-Lived Intangible Assets [Line Items]    
Goodwill 114,418 82,605
Additions 7,898 31,813
Goodwill 122,316 114,418
National Practices [Member]
    
Finite-Lived Intangible Assets [Line Items]    
Goodwill 1,666 1,666
Additions      
Goodwill $ 1,666 $ 1,666