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Dispositions - Additional Information (Detail) - USD ($) |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Aug. 14, 2020 | Aug. 31, 2020 | Sep. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
(Loss) gain on the sale of assets |  |  | $ 78,000 |  | $ 9,230,000 |  | $ 724,000 | $ 112,443,000 |
Proceeds from disposal of assets |  |  |  |  |  |  | 237,000 | $ 246,083,000 |
Gross Amounts of Recognized Assets |  |  | 80,043,000 |  |  |  | 80,043,000 |  | $ 74,602,000
Contingent Consideration |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Gross Amounts of Recognized Assets |  |  | $ 50,220,000 |  |  |  | 50,220,000 |  | $ 15,960,000
North Louisiana |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
(Loss) gain on the sale of assets |  | $ (8,100,000) |  | $ 1,900,000 | $ 2,400,000 |  |  |  |
Fair value of total consideration for sale | $ 260,000,000.0 |  |  |  |  |  |  |  |
Proceeds from disposal of assets | 245,000,000.0 |  |  |  |  |  |  |  |
North Louisiana | Contingent Consideration |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Gross Amounts of Recognized Assets | $ 15,000,000.0 |  |  |  |  |  |  |  |
North Louisiana | Contingent Consideration | Maximum |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Potential contractual payout of contingent consideration |  |  |  |  |  |  | $ 75,000,000.0 |  |
Northwest Pennsylvania |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
(Loss) gain on the sale of assets |  |  |  |  |  | $ 122,500,000 |  |  |
Proceeds from sale of oil and gas properties |  |  |  |  |  | $ 1,000,000.0 |  |  |

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