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Inventories - Summary of Inventories (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]    
Raw materials $ 203,520 $ 191,351
Work-in-process 62,212 54,050
Finished goods 99,977 93,680
Inventories $ 365,709 $ 339,081