Inventories (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Inventory, Net [Abstract]
Raw materials	$ 28,283us-gaap_InventoryRawMaterials	$ 28,293us-gaap_InventoryRawMaterials
Work-in-process	19,169us-gaap_InventoryWorkInProcess	21,881us-gaap_InventoryWorkInProcess
Finished goods	84,020us-gaap_InventoryFinishedGoods	82,997us-gaap_InventoryFinishedGoods
Total	131,472us-gaap_InventoryGross	133,171us-gaap_InventoryGross
Adjust to LIFO cost	(53,221)us-gaap_InventoryLIFOReserve	(62,391)us-gaap_InventoryLIFOReserve
Lower of cost or market adjustment	0us-gaap_InventoryAdjustments	0us-gaap_InventoryAdjustments
Inventory, net	$ 78,251us-gaap_InventoryNet	$ 70,780us-gaap_InventoryNet

Certain changes made in the current period to the value and amount of inventory reported.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 6

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

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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.

+ References

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Amount of difference between inventory at lower of LIFO cost or market and inventory at lower of other inventory accounting method cost or market, for example, but not limited to, FIFO or average cost.

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

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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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