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Commitments and Contingencies - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]      
Rent expense $ 52.2 $ 52.0 $ 46.5
Noncancelable commitments for capital expenditure in 2019 $ 30.2