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Derivative Activities - Effects of Non-Hedge Derivatives on Consolidated Statement of Operations (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2016 | Mar. 31, 2015
Derivative [Line Items] |  |
Derivative Fair Value Income (Loss) | $ 86,908 | $ 122,839
Collars |  |
Derivative [Line Items] |  |
Derivative Fair Value Income (Loss) | 0 | 8,415
Basis Swaps |  |
Derivative [Line Items] |  |
Derivative Fair Value Income (Loss) | 7,275 | (11,353)
Commodity | Swaps |  |
Derivative [Line Items] |  |
Derivative Fair Value Income (Loss) | 79,644 | 125,777
Freight | Swaps |  |
Derivative [Line Items] |  |
Derivative Fair Value Income (Loss) | $ (11) | $ 0

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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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