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Summary of Significant Accounting Policies - Additional Information (Detail) | 1 Months Ended | 11 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2020 USD ($) counterparty | Nov. 19, 2020 USD ($) | Dec. 31, 2020 USD ($) counterparty | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Nov. 18, 2020 USD ($) | Mar. 31, 2020 USD ($) | Jan. 01, 2019 USD ($)
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Retained earnings (accumulated deficit) | $ (49,912,000) | $ 0 | $ (49,912,000) | $ 554,446,000 |  | $ (3,995,209,000) |  |
Capitalized interest costs | 100,000 | 6,400,000 |  | 12,000,000.0 | $ 17,200,000 |  |  |
Amount of capitalized exploratory well costs that have been capitalized for period greater than one year | $ 0 |  | $ 0 |  |  |  |  |
Derivative, number of counterparties | counterparty | 8 |  | 8 |  |  |  |  |
Past-due receivables from counterparties | $ 0 |  | $ 0 |  |  |  |  |
Unrecognized tax benefits | 0 |  | 0 | 0 |  |  |  |
Operating right-of-use assets | 6,083,000 | $ 12,463,000 | 6,083,000 | 18,497,000 |  | $ 13,260,000 |  |
Operating lease liabilities | 4,970,000 |  | 4,970,000 |  |  |  |  |
Finance lease assets | 3,419,000 |  | 3,419,000 | $ 6,303,000 |  |  |  |
Present value of future lease payments | $ 3,530,000 |  | $ 3,530,000 |  |  |  |  |
Accounting Standards Update 2016-02 |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Operating right-of-use assets |  |  |  |  |  |  |  | $ 31,100,000
Operating lease liabilities |  |  |  |  |  |  |  | 37,100,000
Finance lease assets |  |  |  |  |  |  |  | 6,000,000.0
Present value of future lease payments |  |  |  |  |  |  |  | $ 6,000,000.0
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Retained earnings (accumulated deficit) |  |  |  |  |  |  | $ (400,000) |
Allowance for credit loss |  |  |  |  |  |  | $ (400,000) |
Minimum |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Useful life of intangible asset |  |  | 5 years |  |  |  |  |
Maximum |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Useful life of intangible asset |  |  | 14 years |  |  |  |  |
Produced and flowback water disposal facilities, natural gas processing plants and pipelines |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Estimated life of assets |  |  | 30 years |  |  |  |  |
Building |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Estimated life of assets |  |  | 20 years |  |  |  |  |
Furniture, software and equipment | Minimum |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Estimated life of assets |  |  | 2 years |  |  |  |  |
Furniture, software and equipment | Maximum |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Estimated life of assets |  |  | 7 years |  |  |  |  |

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