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Inventories, net - Summary of Inventories (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]    
Raw materials $ 237,547 $ 191,351
Work-in-process 66,635 54,050
Finished goods 94,895 93,680
Inventories $ 399,077 $ 339,081