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Leases - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Leases [Abstract]      
Rent expense $ 12.5 $ 13.7 $ 12.6
Minimum rent commitments in year 1 11.2    
Minimum rent commitments in year 2 7.9    
Minimum rent commitments in year 3 6.1    
Minimum rent commitments in year 4 3.8    
Minimum rent commitments in year 5 2.6    
Minimum rent commitments, thereafter $ 2.0