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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				9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012
Derivative Instruments, (Gain) Loss
Loss (gain) on settlement	$ 13,203	[1]	$ (28,970)	[1]	$ 11,571	[1]	$ 7,366	[1]
Early Settlements
Derivative Instruments, (Gain) Loss
Loss (gain) on settlement			(2,100)		29,300		(59,500)
Amended
Derivative Instruments, (Gain) Loss
Loss (gain) on settlement							$ 117,108
[1] The three-month period ended September 30, 2012 included $2.1 million of gains related to settlements of commodity derivative contracts with contractual maturities after the quarterly period in which they were settled (“early settlements”). The nine-month periods ended September 30, 2013 and 2012 included $29.3 million and $(59.5) million, respectively, of losses (gains) related to early settlements. The nine-month period ended September 30, 2012 also included $117.1 million of non-cash losses due to the amendment of derivative contracts 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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