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Acquisitions and Dispositions - Dispositions - Additional Information (Detail) - USD ($) | 3 Months Ended | 6 Months Ended | 9 Months Ended
--- | --- | --- | ---
Sep. 30, 2016 | Mar. 31, 2016 | Sep. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
(Loss) gain on the sale of assets | $ (2,597,000) |  | $ (681,000) |  |  | $ (7,544,000) | $ 2,053,000
Western Oklahoma Properties |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
(Loss) gain on the sale of assets | (2,600,000) |  |  | $ (6,200,000) |  |  |
Proceeds from sale of oil and gas properties | 900,000 |  |  | 77,700,000 |  |  |
Northeast Pennsylvania Non-operated Interest |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
(Loss) gain on the sale of assets |  | $ (2,100,000) |  |  |  |  |
Proceeds from sale of oil and gas properties |  | $ 111,500,000 |  |  |  |  |
Miscellaneous Proved, Unproved Properties and Surface Acreage |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
(Loss) gain on the sale of assets | 30,000 |  | (681,000) | (198,000) | $ 2,700,000 |  |
Proceeds from sale of oil and gas properties | $ 131,000 |  | $ 524,000 | 1,700,000 | 14,300,000 |  |
Mississippi and South Texas properties |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Proceeds from sale of oil and gas properties |  |  |  | $ 1,200,000 |  |  |
West Texas Properties |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Proceeds from sale of oil and gas properties |  |  |  |  | $ 10,500,000 |  |

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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=66902209&loc=d3e3602-108585 + Details
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- Definition The cash inflow to dispose of long-lived, physical assets and mineral interests in oil and gas properties used for normal oil and gas operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3179-108585 + Details
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