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Inventories - Summary of Inventories (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Inventory Disclosure [Abstract]    
Raw materials $ 303,588 $ 235,593
Work-in-process 76,560 61,908
Finished goods 95,485 87,188
Inventories $ 475,633 $ 384,689