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Inventories - Inventories, Net of Reserves (Detail) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Inventory Disclosure [Abstract]    
Raw materials $ 62,881 $ 60,098
In-process and finished 122,322 115,874
Supplies 72,420 71,242
Total $ 257,623 $ 247,214