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Inventories - Additional Information (Detail) - USD ($)	Sep. 30, 2015	Dec. 31, 2014
Inventory Disclosure [Abstract]
LIFO reserve	$ 28,564,000	$ 34,340,000

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- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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X

- Definition

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.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 210



-SubTopic 10



-Section S99



-Paragraph 1



-Subparagraph (SX 210.5-02.6(c))



-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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