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Derivatives - Cash Settlements and Valuation Gains and Losses on Commodity Derivative Contracts and Interest Rate Swaps (Parenthetical) (Detail) (Commodity Derivatives, USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Derivative Instruments, (Gain) Loss [Line Items]
Realized loss	$ 16,085	[1]	$ 125,456	[1]
Derivative Contracts Early Settlements
Derivative Instruments, (Gain) Loss [Line Items]
Realized loss	29,600
Amended
Derivative Instruments, (Gain) Loss [Line Items]
Realized loss			$ 117,108
[1] The three-month period ended March 31, 2013 includes $29.6 million of realized losses related to settlements of commodity derivative contracts with contractual maturities after the quarterly period in which they were settled (“early settlements”) in conjunction with the sale of the Permian Properties. The three-month period ended March 31, 2012 includes $117.1 million of non-cash realized losses on derivative contracts amended in January 2012.

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- Definition

Gains and losses realized upon settlement of derivative contract.

+ References

No definition available.

+ Details

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- Details

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