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Derivative Instruments - Summary of Gross and Net Information about Commodity Derivative Instruments (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Derivative Fair Value Of Derivative Net [Abstract]
Gross Amounts of Recognized Assets	$ 32,140	$ 68,970
Derivative Assets, Gross Amounts Offset in the Balance Sheet	(21,209)	(44,973)
Net Amounts of Assets Presented in the Balance Sheet	10,931	23,997
Gross Amounts of Recognized Liabilities	25,869	46,401
Derivative Liabilities, Gross Amounts Offset in the Balance Sheet	(21,209)	(44,973)
Net Amounts of Liabilities Presented in the Balance Sheet	$ 4,660	$ 1,428

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- Definition

Fair value of liability associated with 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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