Inventories, Net - Schedule of Inventories Net (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017
Inventory Disclosure [Abstract]
Finished products	$ 612,161	$ 552,999	$ 508,144
Products in process and raw materials	62,480	62,761	59,410
Supplies and expendable parts	134,259	128,792	120,594
Inventories, Gross	808,900	744,552	688,148
Less: Allowances	(157,983)	(143,961)	(138,283)
Total	$ 650,917	$ 600,591	$ 549,865

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Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer.

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Gross amount, as of the balance sheet date, of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process.

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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Amount of valuation reserve for inventory.

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The aggregate carrying amount as of the balance sheet date of items held by the entity which are partially completed at the time of measurement and unprocessed items that will go through the production process and become part of the final product. Includes supplies used directly or indirectly in the manufacturing or production process. This element may be used when the reporting entity combines work in process and raw materials into an aggregate amount.

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Amount before valuation and LIFO reserves of other supplies used within the manufacturing or production process expected to be consumed within one year or operating cycle, if longer.

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