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Inventories - Summary of Inventories (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Inventory Disclosure [Abstract]    
Raw materials $ 50,976 $ 45,507
Work in process 24,359 20,128
Finished goods 77,679 74,205
Inventories, net $ 153,014 $ 139,840