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Dispositions and Acquisitions - Dispositions - Additional Information (Detail) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
(Loss) gain on the sale of assets | $ (10,815,000) | $ (30,000) | $ 156,000 | $ 23,000 | $ 207,000 | $ 102,000 | $ 807,000 | $ 22,600,000 | $ (10,666,000) | $ 23,716,000 | $ (7,074,000)
Northern Oklahoma |  |  |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
(Loss) gain on the sale of assets |  | (39,000) |  |  |  |  |  |  |  |  |
Proceeds from sale of oil and gas properties |  | $ 23,300,000 |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  | (448,000) | 870,000 | 302,000
Proceeds from sale of oil and gas properties |  |  |  |  |  |  |  |  | $ 1,200,000 | 1,300,000 | 3,700,000
Texas Panhandle Properties |  |  |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
(Loss) gain on the sale of assets |  |  |  |  | (989,000) |  |  |  |  |  |
Proceeds from sale of oil and gas properties |  |  |  |  | $ 40,400,000 |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  | 23,800,000 | (5,300,000)
Proceeds from sale of oil and gas properties |  |  |  |  |  |  |  |  |  | $ 30,800,000 | 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
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
Pennsylvania |  |  |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
(Loss) gain on the sale of assets | $ (10,200,000) |  |  |  |  |  |  |  |  |  |
Percentage of royalty disposed | 1.00% |  |  |  |  |  |  |  | 1.00% |  |
Proceeds from leases | $ 300,000,000 |  |  |  |  |  |  |  |  |  |

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