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Acquisitions and Dispositions - Dispositions - Additional Information (Detail) - USD ($) | 3 Months Ended
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Mar. 31, 2017 | Mar. 31, 2016
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |
(Loss) gain on the sale of assets | $ 22,600,000 | $ (1,643,000)
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 | 22,500,000 |
Proceeds from sale of oil and gas properties | 26,000,000 |
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 | 69,000 | 443,000
Proceeds from sale of oil and gas properties | $ 53,000 | 1,600,000
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
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

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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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