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Inventories - Inventories, Net of Reserves (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Inventory Disclosure [Abstract]    
Raw materials $ 60,098 $ 61,266
In-process and finished 115,874 117,580
Supplies 71,242 69,859
Total $ 247,214 $ 248,705