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Fair Value of Derivative Instruments Not Designated as Hedging Instruments (Detail) (Nondesignated, USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Commodity derivative contracts \| Accounts Receivable
Derivatives, Fair Value [Line Items]
Asset Derivatives	$ 13,034	$ 197
Commodity derivative contracts \| Accounts Payable
Derivatives, Fair Value [Line Items]
Liability Derivatives	(13,372)	(489)
Foreign exchange derivative contract \| Accounts Payable
Derivatives, Fair Value [Line Items]
Liability Derivatives	$ (2,897)	$ (8,459)

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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