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Selected Quarterly Financial Data (Unaudited) - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Selected Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
(Loss) gain on the sale of assets | $ (408,909) | $ (681) | $ 2,909 | $ (175) | $ 3,760 | $ 167 | $ 282,064 | $ (353) | $ (406,856) | $ 285,638 | $ 92,291
Impairment of proved properties and other assets | 87,941 | 502,233 |  |  | $ 3,033 |  | 24,991 |  | 590,174 | $ 28,024 | $ 7,753
Virginia And West Virginia Property |  |  |  |  |  |  |  |  |  |  |
Selected Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
(Loss) gain on the sale of assets | (407,700) |  |  |  |  |  |  |  | $ (407,700) |  |
Conger Exchange Transaction |  |  |  |  |  |  |  |  |  |  |
Selected Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
(Loss) gain on the sale of assets |  |  |  |  |  |  | $ 280,100 |  |  |  |
Northern Oklahoma and Legacy Shallow Northwest Pennsylvania Assets |  |  |  |  |  |  |  |  |  |  |
Selected Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impairment of proved properties and other assets |  | $ 502,200 |  |  |  |  |  |  |  |  |
Texas Panhandle And South Texas |  |  |  |  |  |  |  |  |  |  |
Selected Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impairment of proved properties and other assets | $ 87,900 |  |  |  |  |  |  |  |  |  |

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- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=51824106&loc=d3e2420-110228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 + Details
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- Definition Amount of gain (loss) on sale or disposal of proven and unproven oil and gas properties. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 + Details
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