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v3.20.2

Summary of Significant Accounting Policies - Schedule of Derivative Contracts Volume and Prices (Detail) | 1 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Nov. 05, 2020 MMBTU | Sep. 30, 2020 MMBTU $ / MMBTU $ / bbl bbl | Oct. 01, 2020 $ / MMBTU
Natural Gas Swap Contracts |  |  |
Derivative [Line Items] |  |  |
Volume (in MMBTU) | MMBTU |  | 201,241,578 |
Average price |  | 2.57 |
Natural Gas Swap Contracts | Swap Contracts for Q4 |  |  |
Derivative [Line Items] |  |  |
Volume (in MMBTU) | MMBTU |  | 47,658,438 |
Average price |  | 2.63 |
Natural Gas Swap Contracts | Swap Contracts for 2021 |  |  |
Derivative [Line Items] |  |  |
Volume (in MMBTU) | MMBTU |  | 142,633,140 |
Average price |  | 2.55 |
Natural Gas Swap Contracts | Swap Contracts for 2022 |  |  |
Derivative [Line Items] |  |  |
Volume (in MMBTU) | MMBTU |  | 10,950,000 |
Average price |  | 2.53 |
Natural Gas Swap Contracts | Swaption Swap Contracts 2020 |  |  |
Derivative [Line Items] |  |  |
Volume (in MMBTU) | MMBTU |  | 19,320,000 |
Average price |  | 2.52 |
Natural Gas Swap Contracts | Swaption Swap Contracts 2021 |  |  |
Derivative [Line Items] |  |  |
Volume (in MMBTU) | MMBTU |  | 23,650,000 |
Average price |  | 2.52 |
Natural Gas 2-Way Collar Contracts |  |  |
Derivative [Line Items] |  |  |
Volume (in MMBTU) | MMBTU |  | 121,870,000 |
Average Ceiling |  | 2.94 |
Average Floor |  | 2.45 |
Natural Gas 2-Way Collar Contracts | Subsequent Event |  |  |
Derivative [Line Items] |  |  |
Volume (in MMBTU) | MMBTU | 20,000 |  |
Average Ceiling |  |  | 3.70
Average Floor |  |  | 2.60
Natural Gas 2-Way Collar Contracts | Collar Contracts for Q4 |  |  |
Derivative [Line Items] |  |  |
Volume (in MMBTU) | MMBTU |  | 8,720,000 |
Average Ceiling |  | 2.95 |
Average Floor |  | 2.43 |
Natural Gas 2-Way Collar Contracts | Collar Contracts for 2021 |  |  |
Derivative [Line Items] |  |  |
Volume (in MMBTU) | MMBTU |  | 109,550,000 |
Average Ceiling |  | 2.93 |
Average Floor |  | 2.45 |
Natural Gas 2-Way Collar Contracts | Collar Contracts for 2022 |  |  |
Derivative [Line Items] |  |  |
Volume (in MMBTU) | MMBTU |  | 3,600,000 |
Average Ceiling |  | 3.36 |
Average Floor |  | 2.50 |
Natural Gas 3-Way Collar Contracts |  |  |
Derivative [Line Items] |  |  |
Volume (in MMBTU) | MMBTU |  | 4,600,000 |
Average Ceiling |  | 2.99 |
Average Floor |  | 2.63 |
Average Put |  | 2.32 |
Natural Gas 3-Way Collar Contracts | Swap Contracts for Q4 |  |  |
Derivative [Line Items] |  |  |
Volume (in MMBTU) | MMBTU |  | 4,600,000 |
Average Ceiling |  | 2.99 |
Average Floor |  | 2.63 |
Average Put |  | 2.32 |
Natural Gas Swaptions Call Contracts |  |  |
Derivative [Line Items] |  |  |
Volume (in MMBTU) | MMBTU |  | 120,450,000 |
Average price |  | 2.52 |
Natural Gas Swaptions Call Contracts | Swap Contracts for 2021 |  |  |
Derivative [Line Items] |  |  |
Volume (in MMBTU) | MMBTU |  | 71,250,000 |
Average price |  | 2.52 |
Natural Gas Swaptions Call Contracts | Swap Contracts for 2022 |  |  |
Derivative [Line Items] |  |  |
Volume (in MMBTU) | MMBTU |  | 49,200,000 |
Average price |  | 2.51 |
Natural Gas Swaptions Call Contracts | Swaption Contracts 2021 |  |  |
Derivative [Line Items] |  |  |
Volume (in MMBTU) | MMBTU |  | 71,250,000 |
Average price |  | 2.52 |
Natural Gas Swaptions Call Contracts | Swaption Contracts October 2020 | Subsequent Event |  |  |
Derivative [Line Items] |  |  |
Volume (in MMBTU) | MMBTU | 47,450,000 |  |
Average price |  |  | 2.53
Natural Gas Swaptions Call Contracts | Swaption Contracts November 2020 |  |  |
Derivative [Line Items] |  |  |
Volume (in MMBTU) | MMBTU |  | 7,300,000 |
Average price |  | 2.50 |
Natural Gas Swaptions Call Contracts | Swaption Contracts March 2021 |  |  |
Derivative [Line Items] |  |  |
Volume (in MMBTU) | MMBTU |  | 16,500,000 |
Average price |  | 2.50 |
Natural Gas Swaptions Call Contracts | Swaption Contracts 2022 |  |  |
Derivative [Line Items] |  |  |
Volume (in MMBTU) | MMBTU |  | 49,200,000 |
Average price |  | 2.51 |
Natural Gas Swaptions Call Contracts | Swaption Contracts March 2021 |  |  |
Derivative [Line Items] |  |  |
Volume (in MMBTU) | MMBTU |  | 5,400,000 |
Average price |  | 2.50 |
Natural Gas Swaptions Call Contracts | Swaption Contracts October 2021 |  |  |
Derivative [Line Items] |  |  |
Volume (in MMBTU) | MMBTU |  | 36,500,000 |
Average price |  | 2.52 |
Natural Gas Swaptions Call Contracts | Swaption Contracts November 2021 |  |  |
Derivative [Line Items] |  |  |
Volume (in MMBTU) | MMBTU |  | 7,300,000 |
Average price |  | 2.50 |
Crude Oil Collar Contracts |  |  |
Derivative [Line Items] |  |  |
Volume (in Barrels) | bbl |  | 442,000 |
Average Ceiling | $ / bbl |  | 56.06 |
Average Floor | $ / bbl |  | 45.49 |
Crude Oil Collar Contracts | Collar Contracts for Q4 |  |  |
Derivative [Line Items] |  |  |
Volume (in Barrels) | bbl |  | 259,500 |
Average Ceiling | $ / bbl |  | 63.83 |
Average Floor | $ / bbl |  | 49.35 |
Crude Oil Collar Contracts | Collar Contracts for 2021 |  |  |
Derivative [Line Items] |  |  |
Volume (in Barrels) | bbl |  | 182,500 |
Average Ceiling | $ / bbl |  | 45.00 |
Average Floor | $ / bbl |  | 40.00 |

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