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Inventories - Summary of Inventories (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Inventory Disclosure [Abstract]    
Raw materials $ 85,313 $ 81,121
Work-in-process 25,662 26,604
Finished goods 57,104 47,444
Inventories $ 168,079 $ 155,169