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Inventories - Inventories, Net of Reserves (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Inventory Disclosure [Abstract]    
Raw materials $ 64,088 $ 66,359
In-process and finished 117,490 112,507
Supplies 75,186 70,803
Total $ 256,764 $ 249,669