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Inventories - Summary of Inventories (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]    
Raw materials $ 49,571 $ 59,353
Work in process 42,886 48,803
Finished goods 83,121 65,843
Inventories, net $ 175,578 $ 173,999