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Acquisitions and Dispositions - Additional Information (Detail) - USD ($) $ in Thousands |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Jun. 30, 2014 | Apr. 30, 2014 | Jun. 30, 2015 | Mar. 31, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Jun. 16, 2014 | Dec. 31, 2014
Significant Acquisitions And Disposals [Line Items] |  |  |  |  |  |  |  |  |
(Loss) gain on the sale of assets |  |  | $ 2,909 |  | $ 282,064 | $ 2,734 | $ 281,711 |  |
Conger Exchange Transaction |  |  |  |  |  |  |  |  |
Significant Acquisitions And Disposals [Line Items] |  |  |  |  |  |  |  |  |
(Loss) gain on the sale of assets |  | $ 285,100 |  |  |  |  |  |  |
Cash proceeds from sale of assets |  | $ 145,000 |  |  |  |  |  |  | $ 145,000
Net operating income prior to disposition | $ 2,100 |  |  |  |  |  |  | $ 21,900 |
Sale and exchange transaction, closing date |  |  |  |  |  | Jun. 16, 2014 |  |  |
Selling expenses for property sale |  |  |  |  | 5,000 |  | 5,000 |  |
Recognized revenue from sale of property interests acquire | $ 2,800 |  |  |  |  |  |  |  |
Miscellaneous Proved and Unproved Properties |  |  |  |  |  |  |  |  |
Significant Acquisitions And Disposals [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from sale of oil and gas |  |  | 3,600 | $ 10,700 | 1,100 |  | 1,100 |  |
(Loss) gain on the sale of assets |  |  | $ 2,900 | (175) | $ 1,600 |  | $ 1,600 |  |
West Texas |  |  |  |  |  |  |  |  |
Significant Acquisitions And Disposals [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from sale of oil and gas |  |  |  | $ 10,500 |  |  |  |  |

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- Definition The net gains or losses associated with certain assets that were disposed of that do not qualify as discontinued operations. This represents the net operating income the Company recognized prior to asset disposition. + References No definition available. + Details
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- Definition The amount of selling expenses paid to third parties associated with the sale of oil and gas property. + References No definition available. + 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=31042434&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=31042434&loc=d3e3179-108585 + Details
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