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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 $ 8,696 $ 4,567 $ 16,542 $ 33,796
Effective tax rates 43.40% 38.30% 40.40% 38.20%