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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
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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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