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Fair Value of Derivative Instruments Not Designated as Hedging Instruments (Detail) (Nondesignated, USD $)	Dec. 31, 2012	Dec. 31, 2011
Commodity derivative contracts \| Accounts Payable
Derivatives, Fair Value [Line Items]
Liability Derivatives	$ 102,000	$ 489,000
Commodity derivative contracts \| Accounts Receivable
Derivatives, Fair Value [Line Items]
Asset Derivatives	3,043,000	197,000
Foreign exchange derivative contract \| Accounts Payable
Derivatives, Fair Value [Line Items]
Liability Derivatives	$ 1,031,000	$ 8,459,000

Fair value of derivative asset, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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- Definition

Fair value of derivative liability, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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