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Derivative Activities - Effects of Derivatives on Consolidated Statements of Operations (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Derivative [Line Items] |  |
Derivative Fair Value (Loss) Income | $ (14,009) | $ 165,557
Swaptions |  |
Derivative [Line Items] |  |
Derivative Fair Value (Loss) Income | 3,599 |
Collars |  |
Derivative [Line Items] |  |
Derivative Fair Value (Loss) Income | (77) | 9,475
Puts |  |
Derivative [Line Items] |  |
Derivative Fair Value (Loss) Income |  | 6,707
Calls |  |
Derivative [Line Items] |  |
Derivative Fair Value (Loss) Income | 177 | 510
Basis Swaps |  |
Derivative [Line Items] |  |
Derivative Fair Value (Loss) Income | (864) | (17,972)
Commodity | Swaps |  |
Derivative [Line Items] |  |
Derivative Fair Value (Loss) Income | (16,536) | 166,752
Freight | Commodity | Swaps |  |
Derivative [Line Items] |  |
Derivative Fair Value (Loss) Income | $ (308) | $ 85

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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=84234895&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=84234895&loc=SL5624171-113959 + Details
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