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Commitments and Contingencies - Composition of Total Rental Expense Under Noncancelable (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Leases [Abstract]      
Minimum rentals $ 294,107 $ 276,676 $ 252,285
Less sublease rentals (2,808) (3,446) (4,322)
Rental Expense, Net Total $ 291,299 $ 273,230 $ 247,963