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Inventories - Summary of Inventories (Detail) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Inventory Disclosure [Abstract]    
Raw materials $ 52,916 $ 49,205
Work in process 34,786 31,348
Finished goods 36,000 34,298
Inventories $ 123,702 $ 114,851