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Inventories Net (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Inventory Disclosure [Abstract]    
Finished products $ 479,291 $ 433,649
Products in process and raw materials 61,171 55,194
Supplies and expendable parts 116,024 110,882
Inventories, Gross 656,486 599,725
Less allowances (134,862) (130,584)
Total $ 521,624 $ 469,141