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Inventories - Inventories, Net of Reserves (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Inventory Disclosure [Abstract]    
Raw materials $ 66,359 $ 60,098
In-process and finished 112,507 115,874
Supplies 70,803 71,242
Total $ 249,669 $ 247,214