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Fair Value Measurements - Additional Information (Detail) - USD ($) | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Aug. 31, 2020 | Sep. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2030 | Dec. 31, 2026 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Aug. 14, 2020
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest and dividends |  |  |  |  |  |  |  | $ 713,000 | $ 1,100,000 | $ 1,100,000 |
Mark-to-market gain (loss) |  |  |  |  |  |  |  | $ 6,300,000 | 8,500,000 | (7,900,000) |
North Louisiana |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impairment of proved properties and other assets |  |  | $ 77,000,000.0 | $ 1,100,000,000 |  |  |  |  |  |  |
Annual discount rate |  |  |  |  |  |  |  | 12.00% |  |  |
Divestiture contract obligation |  |  |  |  |  |  |  |  |  |  | $ 479,800,000
Estimated production volumes, percentage |  |  |  |  |  |  |  | 34.00% |  |  |
North Louisiana | Sensitivity Of Devemopment Plan |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |
Divestiture contract obligation |  |  |  |  |  |  |  | $ 29,000,000.0 |  |  |
North Louisiana | Sensitivity Flat Plant Allocation Percentage | Forecast |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |
Divestiture contract obligation |  |  |  |  |  | $ 17,900,000 |  |  |  |  |
Pennsylvania |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |
Assets, fair value |  |  |  |  |  |  |  |  |  | 0 |
Oklahoma |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impairment of proved properties and other assets |  |  |  |  | $ 7,300,000 |  |  |  |  | $ 15,300,000 |
North Louisiana Assets | Fair Value, Inputs, Level 2 | Leases |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impairment of proved properties and other assets |  |  |  |  |  |  |  | 2,000,000.0 |  |  |
Houston | Fair Value, Inputs, Level 2 | Leases |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impairment of proved properties and other assets |  |  |  |  |  |  |  |  | $ 2,100,000 |  |
Minimum | North Louisiana | Forecast |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |
Estimated production volumes, percentage |  |  |  |  |  | 34.00% |  |  |  |  |
Maximum | North Louisiana | Forecast |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |
Estimated production volumes, percentage |  |  |  |  |  |  | 100.00% |  |  |  |
Maximum | North Louisiana | Contingent Consideration |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |
Potential Contractual Payout Of Contingent Consideration | $ 90,000,000 | $ 90,000,000.0 |  |  |  |  |  | $ 90,000,000.0 |  |  |
Measurement Input, Price Volatility | Weighted Average |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |
Implied volatilities |  |  |  |  |  |  |  | 44.00% |  |  |
Measurement Input, Price Volatility | Weighted Average | Swaption |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |
Implied volatilities |  |  |  |  |  |  |  | 24.00% |  |  |
Measurement Input, Price Volatility | Minimum |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |
Implied volatilities |  |  |  |  |  |  |  | 34.00% |  |  |
Measurement Input, Price Volatility | Maximum |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |
Implied volatilities |  |  |  |  |  |  |  | 66.00% |  |  |
Discount Rate |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |
Annual discount rate |  |  |  | 12.00% |  |  |  |  | 12.00% |  |

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