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Income Taxes - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Income Tax Disclosure [Abstract]        
Income tax expense $ 21,247 $ 16,516 $ 37,120 $ 32,209
Effective tax rate 38.70% 40.10% 38.70% 40.60%
U.S. federal statutory rate     35.00%