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Inventories - Summary of Inventories (Detail) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Inventory Disclosure [Abstract]    
Raw materials $ 78,707 $ 78,352
Work-in-process 24,665 23,297
Finished goods 48,278 50,982
Inventories $ 151,650 $ 152,631