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Income Taxes - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Income Tax Disclosure [Abstract]        
Income tax expense $ 13,561 $ 9,953 $ 29,229 $ 20,643
Effective tax rates 38.10% 37.70% 38.10% 37.70%