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Income Taxes - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Income Tax Contingency [Line Items]        
Effective tax rate     37.20% 37.60%
Income tax expense $ 2,544 $ 5,387 $ 23,657 $ 21,934
Valuation allowance $ 4,500   4,500  
Excess tax benefits from stock-based awards     $ 2,400  
Earliest Tax Year [Member] | Federal Tax Jurisdiction [Member]        
Income Tax Contingency [Line Items]        
Tax years subject to examination     2012  
Latest Tax Year [Member] | Federal Tax Jurisdiction [Member]        
Income Tax Contingency [Line Items]        
Tax years subject to examination     2014