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Income Taxes - Additional Information (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Income Taxes [Line Items]      
Income tax expense $ 5.7 $ 5.8  
Unrecognized tax benefits 1.5   $ 1.3
Accrued Interest included in unrecognized tax benefits 0.2   $ 0.2
Unrecognized tax benefits if recognized would impact on effective income tax rate $ 1.5    
Income tax examination description With a few exceptions, we are no longer subject to U.S. federal, state and local, or non-U.S. income tax examinations by tax authorities for years before 2014.    
Base Erosion and Anti-Abuse Tax (“BEAT”) [Member]      
Income Taxes [Line Items]      
Income tax expense $ 3.9    
Foreign Operation [Member]      
Income Taxes [Line Items]      
Income tax expense $ 1.6