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Supplementary Quarterly Financial Data (Unaudited) - Schedule of Supplementary Quarterly Financial Data (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Quarterly Financial Data [Abstract]
Total oil and gas sales	$ 48,498	$ 50,330	$ 40,715	$ 36,163	$ 47,228	$ 61,360	$ 77,312	$ 66,522	$ 175,706	$ 252,422	$ 555,231
Operating loss	(5,805)	(98,789)	(22,706)	(56,490)	(290,515)	(596,026)	(182,185)	(96,928)	(183,790)	(1,165,654)	(32,071)
Net Income (loss)	$ (54,933)	$ (28,476)	$ 4,852	$ (56,577)	$ (288,543)	$ (544,996)	$ (135,068)	$ (78,502)	$ (135,134)	$ (1,047,109)	$ (57,111)
Income (loss) per share:
Basic and diluted	$ (4.48)	$ (2.32)	$ 0.42	$ (5.71)	$ (31.26)	$ (59.05)	$ (14.64)	$ (8.53)	$ (11.52)	$ (113.53)	$ (6.20)

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- Definition

The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Net Income
-URI http://asc.fasb.org/extlink&oid=51831255

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
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-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 942
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-Section S99
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
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-Glossary Other Comprehensive Income
-URI http://asc.fasb.org/extlink&oid=51831270

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Revenue from the sale of oil and gas during the period.

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The net result for the period of deducting operating expenses from operating revenues.

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