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Goodwill and Other Intangible Assets, Net - Amortization Expense Related to Client Lists and Other Intangible Assets (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]      
Total amortization expense $ 14,731 $ 14,478 $ 13,535
Operating Expenses [Member]      
Finite-Lived Intangible Assets [Line Items]      
Total amortization expense 14,714 14,462 13,520
Corporate General and Administrative Expenses [Member]      
Finite-Lived Intangible Assets [Line Items]      
Total amortization expense $ 17 $ 16 $ 15