v3.8.0.1

Inventories - Schedule of Inventories (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Inventory Disclosure [Abstract]
Raw materials	$ 25,257	$ 32,928
Work-in-process	19,681	22,753
Finished goods	103,380	88,497
Total Inventory at FIFO cost	148,318	144,178
Adjust to LIFO cost	(53,820)	(51,813)
Inventory, net	$ 94,498	$ 92,365	[1]
[1] The consolidated balance sheet at December 31, 2017, as presented, is derived from the audited consolidated financial statements at that date.

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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 merchandise or goods in the production process expected to be completed within one year or operating cycle, if longer.

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