Annual report pursuant to Section 13 and 15(d)

Inventories - Summary of Inventories (Detail)

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Inventories - Summary of Inventories (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Inventory Disclosure [Abstract]    
Finished Goods $ 35,193 $ 28,792
Work in Progress 33,219 20,790
Raw Material 81,784 67,015
Total Inventory $ 150,196 $ 116,597