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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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