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Derivative Activities - Derivative Fair Value Income (Detail) (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
Derivatives Fair Value [Line Items] |  |  |  |  |  |  |  |
Change in fair value of derivatives that do not qualify or are not designated for hedge accounting | $ 159,371 | [1] | $ 135,777 | [1] | $ 62,569 | [1] | $ 83,721 | [1]
Realized loss on settlement–natural gas | (24,543) | [1],[2] |  |  | (23,728) | [1],[2] |  |
Realized gain (loss) on settlement–oil | (111) | [1],[2] | 768 | [1],[2] | (213) | [1],[2] | (3,854) | [1],[2]
Realized gain on settlement–NGLs | 3,043 | [1],[2] | 10,152 | [1],[2] | 2,148 | [1],[2] | 5,760 | [1],[2]
Hedge ineffectiveness-realized | (155) |  | 1,278 |  | 409 |  | 2,463 |
Hedge ineffectiveness-unrealized | 155 |  | 594 |  | (3,300) |  | (354) |
Derivative fair value income | $ 137,760 |  | $ 148,569 |  | $ 37,885 |  | $ 87,736 |
[1] | Derivatives that did not qualify or were not designated for hedge accounting. Change in fair value of derivatives line also includes gains of $103.8 million in second quarter 2013 and gains of $22.4 million in the first six months 2013 related to discontinuance of hedge accounting.
[2] | These amounts represent the realized gains and losses on settled derivatives that did not qualify or were not designated for hedge accounting, which before settlement are included in the category in this same table referred to as change in fair value of derivatives that did not qualify or were not designated for hedge accounting.

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- Definition Net Increase or Decrease in the fair value of the derivative or group of derivatives included in earnings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5618551-113959 + Details
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- Definition The increase (decrease) during the period, which was recognized in earnings, in the unrealized gains or losses on derivative instruments that are not or are no longer designated 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 20 -Section 35 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6439004&loc=d3e65527-113976 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 18 -Subparagraph a, b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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