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Composition of Inventories, Net (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Inventory [Line Items]    
Raw material $ 62,668 $ 58,530
Work-in-process 19,464 22,946
Finished Goods 25,393 54,482
Inventories, net $ 107,525 $ 135,958