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Acquisitions and Dispositions - Additional Information (Detail) - USD ($) | 1 Months Ended | 3 Months Ended | 6 Months Ended | 10 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Feb. 28, 2015 | Apr. 30, 2014 | Apr. 30, 2013 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2014 | Jun. 16, 2014 | Nov. 01, 2015 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
(Loss) gain on the sale of assets |  |  |  | $ (408,909,000) | $ (681,000) | $ 2,909,000 | $ (175,000) | $ 3,760,000 | $ 167,000 | $ 282,064,000 | $ (353,000) |  |  |  | $ (406,856,000) | $ 285,638,000 | $ 92,291,000
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 |  |  |  |  |  |  |  |  |  | $ 280,100,000 |  |  |  |  |  |  |
Cash proceeds from sale of assets |  | $ 145,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net operating income prior to disposition |  |  |  |  |  |  |  |  |  |  |  | $ 25,700,000 | $ 21,900,000 |  |  |  | 48,700,000
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 |
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% |  |  |  | 50.00% |
Percentage ownership interest |  |  |  |  |  |  |  | 50.00% |  |  |  | 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 |
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 | 46,100,000
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 | $ 10,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 943,000 | 3,000,000 | 13,200,000
Proceeds from sale of oil and gas |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,400,000 | $ 35,500,000 | $ 40,500,000
Delaware and Permian Basin |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
(Loss) gain on the sale of assets |  |  | $ 83,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of oil and gas |  |  | 275,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Selling expenses for property sale |  |  | $ 4,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |

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