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Derivatives - Cash Settlements and Valuation Gains and Losses on Commodity Derivative Contracts and Interest Rate Swaps (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
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Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Derivative Instruments, (Gain) Loss |  |  |  |  |  |  |  |
Loss (gain) due to change in fair value |  |  |  |  | $ 56,085 |  | $ (234,705) |
Loss (gain) on derivative contracts | 132,808 |  | 193,497 |  | 70,051 |  | (221,707) |
Commodity Derivatives |  |  |  |  |  |  |  |
Derivative Instruments, (Gain) Loss |  |  |  |  |  |  |  |
Loss (gain) on settlement | 13,203 | [1] | (28,970) | [1] | 11,571 | [1] | 7,366 | [1]
Loss (gain) due to change in fair value | 119,605 |  | 222,467 |  | 58,480 |  | (229,073) |
Loss (gain) on derivative contracts | 132,808 |  | 193,497 |  | 70,051 |  | (221,707) |
Interest Rate Swap |  |  |  |  |  |  |  |
Derivative Instruments, (Gain) Loss |  |  |  |  |  |  |  |
Loss (gain) on settlement | 0 |  | 2,330 |  | 2,409 |  | 6,824 |
Loss (gain) due to change in fair value | 0 |  | (2,033) |  | (2,395) |  | (5,632) |
Loss (gain) on derivative contracts | $ 0 |  | $ 297 |  | $ 14 |  | $ 1,192 |
[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. + References No definition available. + Details
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- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 + Details
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- Definition The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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