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Income Taxes (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Income Tax Disclosure [Abstract]      
Effective tax rate 127.70% 23.00%  
Unrecognized tax benefits $ 12.1   $ 9.5
Unrecognized tax benefits if recognized that would affect effective tax rate 10.2   8.4
Accrued interest related to uncertain tax positions 1.0   $ 0.9
Unrecognized tax benefits subject to change within the next 12 months $ 6.2