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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
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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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