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Derivative Activities - Effects of Derivatives on Consolidated Statements of Operations (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Derivative [Line Items]
Derivative Fair Value Income (Loss)	$ 195,245	$ (103,290)	$ 133,514	$ (117,299)
Swaptions
Derivative [Line Items]
Derivative Fair Value Income (Loss)	32,383	(6,592)	29,092	(2,993)
Collars
Derivative [Line Items]
Derivative Fair Value Income (Loss)	578	11	(3,946)	(66)
Calls
Derivative [Line Items]
Derivative Fair Value Income (Loss)		152		329
Basis Swaps
Derivative [Line Items]
Derivative Fair Value Income (Loss)	938	(5,828)	4,353	(6,693)
Commodity | Swaps
Derivative [Line Items]
Derivative Fair Value Income (Loss)	159,128	(91,195)	101,710	(107,730)
Freight | Commodity | Swaps
Derivative [Line Items]
Derivative Fair Value Income (Loss)	$ 2,218	$ 162	$ 2,305	$ (146)

X

- Definition

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959

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