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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
 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Finite-Lived Intangible Assets [Line Items]    
Goodwill $ 7,378 $ 7,241
Client Lists [Member]
    
Finite-Lived Intangible Assets [Line Items]    
Other intangible assets 3,499 7,173
Other Intangible Assets [Member]
    
Finite-Lived Intangible Assets [Line Items]    
Other intangible assets $ 166 $ 220