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Dispositions and Acquisitions - Dispositions - Additional Information (Detail) - USD ($) | 1 Months Ended | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Feb. 28, 2015 | Apr. 30, 2014 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Jun. 16, 2014 | Sep. 30, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 30, 2015 | 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 |  |  | $ 470,000 | $ (2,597,000) | $ (3,304,000) | $ (1,643,000) | $ (408,909,000) | $ (681,000) | $ 2,909,000 | $ (175,000) |  |  |  | $ (7,074,000) | $ (406,856,000) |  | $ 285,638,000
Conger Exchange Transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash proceeds from sale of assets |  | $ 145,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net operating income prior to disposition |  |  |  |  |  |  |  |  |  |  |  | $ 21,900,000 |  |  |  |  |
Gain on sale of assets after selling expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 272,700,000
Sale and exchange transaction, closing date |  |  |  |  |  |  |  |  |  |  |  |  |  | Jun. 16, 2014 |  |  |
Selling expenses for property sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,000,000
Net operating income prior to acquisition |  |  |  |  |  |  |  |  |  |  | $ 25,700,000 |  |  |  |  |  |
Recognized revenue from sale of property interests acquire |  |  |  |  |  |  |  |  |  |  | $ 33,800,000 |  |  |  |  |  |
Nora Gathering, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership interest, acquired |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  | 50.00%
Percentage ownership interest |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  | 50.00%
Fair value of membership interest on acquisition date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 134,800,000
Nora Gathering, LLC | Conger Exchange Transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on fair value of membership interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,000,000
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 |  |  |  |  |  |  |  |  |  |  |  |  | $ (5,300,000) |  |  |  |
Proceeds from sale of oil and gas properties |  |  |  |  |  |  |  |  |  |  |  |  | $ 78,600,000 |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 302,000 | 943,000 |  | 3,000,000
Proceeds from sale of oil and gas properties |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,700,000 | 4,400,000 |  | 35,500,000
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 |  |  |
Virginia And West Virginia Property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
(Loss) gain on the sale of assets |  |  |  |  |  |  | $ (407,700,000) |  |  |  |  |  |  |  | (407,700,000) |  |
Cash proceeds from sale of assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 876,000,000 |  |
Net operating income prior to disposition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 52,300,000 | $ 98,300,000
West Texas Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
(Loss) gain on the sale of assets | $ (101,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of oil and gas properties | $ 10,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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