Inventories (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017
Inventory Disclosure [Abstract]
Raw materials	$ 250,051	$ 233,410	$ 211,959
Work-in-process	125,336	124,396	132,071
Finished goods	384,815	433,937	415,645
Other	12,999	12,370	13,128
Inventory, Gross, Total	773,201	804,113	772,803
Adjustment to value inventory at cost on the LIFO method	(82,823)	(82,823)	(68,419)
Inventories	$ 690,378	$ 721,290	$ 704,384

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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 by which inventory stated at last-in first-out (LIFO) is less than (in excess of) inventory stated at other inventory cost methods.

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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 before valuation and LIFO reserves of raw materials expected to be sold, or consumed within one year or operating cycle, if longer.

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

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

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