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Income Taxes - Additional Information (Detail) - USD ($)
$ in Millions
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 $ 4.8 $ 10.4 $ 10.5 $ 18.7
Effective tax rate 33.80% 36.40% 34.70% 36.50%