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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				6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013		Jun. 30, 2012
Derivative Instruments, (Gain) Loss
Realized (gain) loss	$ (17,717)	[1]	$ (89,120)	[1]	$ (1,632)	[1]	$ 36,336	[1]
Early Settlements
Derivative Instruments, (Gain) Loss
Realized (gain) loss	(700)		(57,300)		29,000		(57,300)
Amended
Derivative Instruments, (Gain) Loss
Realized (gain) loss							$ 117,108
[1] The three-month periods ended June 30, 2013 and 2012 included $0.7 million and $57.3 million, respectively, of realized gains related to settlements of commodity derivative contracts with contractual maturities after the quarterly period in which they were settled (“early settlements”). The six-month periods ended June 30, 2013 and 2012 included $29.0 million and $(57.3) million, respectively, of realized losses (gains) related to early settlements. The six-month period ended June 30, 2012 also included $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.

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No definition available.

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