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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
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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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