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Derivative Activities - Effects of Derivatives on Consolidated Statements of Operations (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |
Derivative Fair Value Income (Loss) | $ 25,024 | $ (88,426) | $ 111,195 | $ 165,557 | $ (250,057) | $ 64,556 | $ (162,798) | $ 86,908 | $ 213,350 | $ (261,391) | $ 416,364
Swaptions |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |
Derivative Fair Value Income (Loss) |  |  |  |  |  |  |  |  | 6,534 | 0 | 0
Re-purchased Swaps |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |
Derivative Fair Value Income (Loss) |  |  |  |  |  |  |  |  | 0 | 0 | 851
Collars |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |
Derivative Fair Value Income (Loss) |  |  |  |  |  |  |  |  | 18,132 | (6,926) | 16,539
Basis Swaps |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |
Derivative Fair Value Income (Loss) |  |  |  |  |  |  |  |  | (4,647) | 29,154 | 954
Puts |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |
Derivative Fair Value Income (Loss) |  |  |  |  |  |  |  |  | 10,929 | (18,201) | 0
Calls |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |
Derivative Fair Value Income (Loss) |  |  |  |  |  |  |  |  | 987 | (18) | 0
Commodity | Swaps |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |
Derivative Fair Value Income (Loss) |  |  |  |  |  |  |  |  | 181,095 | (265,466) | 398,020
Freight | Commodity | Swaps |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |
Derivative Fair Value Income (Loss) |  |  |  |  |  |  |  |  | $ 320 | $ 66 | $ 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=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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