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Inventories - Summary of Inventories (Detail) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Inventory Disclosure [Abstract]    
Raw materials $ 39,766 $ 50,204
Work in process 33,807 30,604
Finished goods 46,546 39,028
Inventories $ 120,119 $ 119,836