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Inventories - Inventory, Net of Reserves (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Inventory, Net, Items Net of Reserve Alternative [Abstract]    
Raw materials $ 104,708 $ 99,033
Work in progress 18,884 15,324
Finished goods 176,022 155,937
Total inventories $ 299,614 $ 270,294