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Dispositions - Additional Information (Detail) | 3 Months Ended | 12 Months Ended
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Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) a | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
(Loss) gain on the sale of assets | $ 407,000 | $ (36,341,000) | $ 5,867,000 | $ (189,000) | $ (10,815,000) | $ (30,000) | $ 156,000 | $ 23,000 |  | $ (30,256,000) | $ (10,666,000) | $ 23,716,000
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 |  |  |  |  |  |  |  |  |  | 337,000 | (448,000) | 870,000
Proceeds from sale of oil and gas properties |  |  |  |  |  |  |  |  |  | $ 938,000 | $ 1,200,000 | 1,300,000
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 |  |  |  |  |  |
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
Proceeds from sale of oil and gas properties |  |  |  |  |  |  |  |  |  |  |  | $ 30,800,000
Pennsylvania |  |  |  |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
(Loss) gain on the sale of assets |  | $ (36,500,000) | 5,900,000 |  | $ (10,200,000) |  |  |  |  |  |  |
Percentage of royalty disposed |  | 2.50% |  |  | 1.00% |  |  |  |  |  | 1.00% |
Proceeds from sale of oil and gas properties |  | $ 750,000,000.0 | $ 34,000,000.0 |  | $ 300,000,000.0 |  |  |  |  |  |  |
Pennsylvania | Natural Gas and Oil Properties |  |  |  |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of acres sold | a |  |  | 20,000 |  |  |  |  |  |  |  |  |

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