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Inventories - Summary of Inventories (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Inventory Disclosure [Abstract]    
Raw materials $ 50,274 $ 49,571
Work in process 38,870 42,886
Finished goods 77,154 83,121
Inventories, net $ 166,298 $ 175,578