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Derivative Activities - Effects of Non-Hedge Derivatives on Consolidated Statement of Operations (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Derivative Financial Instruments [Line Items] |  |  |  |
Derivative Fair Value Income (Loss) | $ (34,791) | $ (24,109) | $ 88,048 | $ (170,959)
Swaps |  |  |  |
Derivative Financial Instruments [Line Items] |  |  |  |
Derivative Fair Value Income (Loss) | (42,100) | (38,521) | 83,676 | (82,593)
Collars |  |  |  |
Derivative Financial Instruments [Line Items] |  |  |  |
Derivative Fair Value Income (Loss) | (1,650) | 1,032 | 6,765 | (38,116)
Basis Swaps |  |  |  |
Derivative Financial Instruments [Line Items] |  |  |  |
Derivative Fair Value Income (Loss) | $ 8,959 | $ 13,380 | $ (2,393) | $ (50,250)

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- Definition Derivative financial instruments. + References No definition available. + Details
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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + 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=35706170&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 + Details
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