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Income Taxes - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Income Tax Disclosure [Abstract]        
Income tax expense $ 17,281 $ 17,602 $ 54,400 $ 49,811
Effective tax rate 39.10% 36.70% 38.80% 39.20%
U.S. federal statutory rate     35.00%