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Income Taxes - Additional Information (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Income Tax Disclosure [Abstract]      
Effective income tax rate (as a percent) 27.60% 31.50%  
Liability for uncertain tax positions $ 8.4   $ 8.4
Unrecognized tax benefits if recognized that would affect effective tax rate 4.2   4.2
Accrued interest related to uncertain tax positions 0.9   0.8
Accrued penalties related to uncertain tax positions 0.3   $ 0.3
Unrecognized tax benefits subject to change within the next 12 months $ 4.0