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Derivative Financial Instruments and Hedging Activities - Additional Information (Detail)	2 Months Ended	12 Months Ended
	Feb. 17, 2021 MMBTU Boe	Dec. 31, 2020 USD ($) MMBTU $ / MMBTU	Feb. 16, 2021 $ / MMBTU $ / bbl
Natural Gas 2-Way Collar Contracts
Derivative Instruments And Hedging Activities [Line Items]
Volume (in MMBTU) | MMBTU		120,450,000
Ceiling, Average price (in dollars per MMBTU) | $ / MMBTU		2.99
Floor, Average price (in dollars per MMBTU) | $ / MMBTU		2.46
Natural Gas 2-Way Collar Contracts | Subsequent Event
Derivative Instruments And Hedging Activities [Line Items]
Volume (in MMBTU) | MMBTU	32,880,000
Ceiling, Average price (in dollars per MMBTU) | $ / MMBTU			3.20
Floor, Average price (in dollars per MMBTU) | $ / MMBTU			2.50
Oil Collar Contracts | Subsequent Event
Derivative Instruments And Hedging Activities [Line Items]
Volume (in MMBTU) | Boe	349,500
Ceiling, Average price (in dollars per MMBTU) | $ / bbl			54.96
Floor, Average price (in dollars per MMBTU) | $ / bbl			42.39
Natural Gas Swap Contract
Derivative Instruments And Hedging Activities [Line Items]
Volume (in MMBTU) | MMBTU		208,333,140
Natural Gas Swap Contract | Subsequent Event
Derivative Instruments And Hedging Activities [Line Items]
Volume (in MMBTU) | MMBTU	7,300,000
Ceiling, Average price (in dollars per MMBTU) | $ / MMBTU			2.70
Basis Swap Contracts
Derivative Instruments And Hedging Activities [Line Items]
Volume (in MMBTU) | MMBTU		25,550,000
Fair value of derivative net asset | $		$ 1,000,000.0
Interest Rate Swap Contracts
Derivative Instruments And Hedging Activities [Line Items]
Line of credit facility, fair value of amount outstanding | $		500,000,000.0
Derivative liability | $		$ 2,100,000
Interest Rate Swap Contracts | LIBOR
Derivative Instruments And Hedging Activities [Line Items]
Line of credit facility, commitment fee percentage		0.33%

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- Definition

Derivative instruments and hedging activities line items.

+ References

No definition available.

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
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-Publisher FASB
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- Definition

The average cap rate on a group of price risk derivatives such as caps or collars. A payment or receipt is triggered if the market rate exceeds the cap rate on the contract.

+ References

No definition available.

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- Definition

The average floor rate on a group of price risk derivatives such as floors or collars. A payment or receipt is triggered if the market rate falls below the floor rate on the contract.

+ References

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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

+ References

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- Definition

Nominal number of units used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
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- Definition

Nominal energy measure used to calculate payments on a derivative instrument.

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- Definition

The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

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Fair value of the amount outstanding under the credit facility.

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