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Inventories - Summary of Inventories (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Inventory Disclosure [Abstract]    
Raw materials $ 177,677 $ 150,150
Work-in-process 54,909 39,105
Finished goods 86,874 86,614
Inventories $ 319,460 $ 275,869