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Commitments and Contingencies - Total Rent Expense under Operating Lease (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Operating Leased Assets [Line Items]      
Rent expense under operating leases $ 17,239 $ 15,123 $ 11,580
Cost of Sales [Member]      
Operating Leased Assets [Line Items]      
Rent expense under operating leases 546 813 848
Administrative [Member]      
Operating Leased Assets [Line Items]      
Rent expense under operating leases $ 16,693 $ 14,310 $ 10,732