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Acquisitions - Additions to Goodwill, Client Lists and Other Intangible Assets Resulting from Acquisitions and Contingent Consideration Earned on Prior Period Acquisitions (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]    
Goodwill $ 9,575 $ 57,688
Client lists [Member]
    
Finite-Lived Intangible Assets [Line Items]    
Other intangible assets 3,819 40,165
Other intangibles [Member]
    
Finite-Lived Intangible Assets [Line Items]    
Other intangible assets $ 182 $ 1,450