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Derivative Activities - Effects of Non-Hedge Derivatives on Consolidated Statement of Operations (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Derivative Financial Instruments [Line Items] |  |  |  |
Derivative Fair Value Income (Loss) | $ 202,004 | $ 142,057 | $ 290,052 | $ (28,902)
Swaps |  |  |  |
Derivative Financial Instruments [Line Items] |  |  |  |
Derivative Fair Value Income (Loss) | 198,245 | 105,767 | 281,921 | 23,173
Re-purchased Swaps |  |  |  |
Derivative Financial Instruments [Line Items] |  |  |  |
Derivative Fair Value Income (Loss) | 1,683 | 0 | 1,683 | 0
Collars |  |  |  |
Derivative Financial Instruments [Line Items] |  |  |  |
Derivative Fair Value Income (Loss) | 5,626 | 30,119 | 12,391 | (7,997)
Basis Swaps |  |  |  |
Derivative Financial Instruments [Line Items] |  |  |  |
Derivative Fair Value Income (Loss) | $ (3,550) | $ 6,171 | $ (5,943) | $ (44,078)

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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=56946850&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=56946850&loc=SL5624171-113959 + Details
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