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Inventories, Net - Schedule of Inventories Net (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Inventory Disclosure [Abstract]    
Finished products $ 605,912 $ 615,719
Products in process and raw materials 65,928 66,920
Supplies and expendable parts 142,032 139,566
Inventories, Gross 813,872 822,205
Less: Allowances (164,156) (159,170)
Total $ 649,716 $ 663,035