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Goodwill and Other Intangible Assets, Net - Amortization Expense Related to Client Lists and Other Intangible Assets (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]      
Total amortization expense $ 14,056 $ 11,983 $ 10,560
Operating expenses [Member]
      
Finite-Lived Intangible Assets [Line Items]      
Total amortization expense 14,041 11,967 10,543
Corporate general and administrative expenses [Member]
      
Finite-Lived Intangible Assets [Line Items]      
Total amortization expense $ 15 $ 16 $ 17