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Acquisitions and Dispositions - Additional Information (Detail) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Apr. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2014 | Jun. 30, 2015 | Jun. 16, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
(Loss) gain on the sale of assets |  | $ (681) |  | $ 167 |  |  | $ 2,053 | $ 281,878 |
Conger Exchange Transaction |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
(Loss) gain on the sale of assets |  |  |  |  |  |  |  | 285,200 |
Cash proceeds from sale of assets | $ 145,000 |  |  |  |  |  |  |  | $ 145,000
Net operating income prior to disposition |  |  | $ 14,600 |  |  | $ 21,900 |  |  |
Sale and exchange transaction, closing date |  |  |  |  |  |  | Jun. 16, 2014 |  |
Selling expenses for property sale |  |  |  |  |  |  |  | 5,000 |
Recognized revenue from sale of property interests acquire |  |  | $ 18,400 |  |  |  |  |  |
Miscellaneous Proved, Unproved Properties and Surface Acreage |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from sale of oil and gas |  | 524 |  |  | $ 14,300 |  |  | 2,100 |
(Loss) gain on the sale of assets |  | $ (681) |  |  | 2,700 |  |  | $ 1,700 |
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 |  |  |  |  | $ 10,500 |  |  |  |

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