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Inventories - Summary of Inventories (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Inventory Disclosure [Abstract]    
Raw material $ 191,351 $ 150,150
Work-in-process 54,050 39,105
Finished goods 93,680 86,614
Inventories $ 339,081 $ 275,869