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Leases - Additional Information (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Jan. 01, 2019
Leases [Abstract]    
Additional lease assets   $ 20.2
Additional lease liabilities   $ 20.5
Increase in finance lease liability $ 8.0  
Increase in finance lease asset $ 8.0