Inventories Net (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Inventory Disclosure [Abstract]
Finished products	$ 413,766us-gaap_InventoryFinishedGoods	$ 368,334us-gaap_InventoryFinishedGoods
Products in process and raw materials	65,250	16,077
Supplies and expendable parts	125,092us-gaap_OtherInventorySupplies	61,922us-gaap_OtherInventorySupplies
Inventories, Gross	604,108us-gaap_InventoryGross	446,333us-gaap_InventoryGross
Less allowances	(119,189)us-gaap_InventoryValuationReserves	(99,026)us-gaap_InventoryValuationReserves
Total	$ 484,919us-gaap_InventoryNet	$ 347,307us-gaap_InventoryNet

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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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