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Derivative Financial Instruments and Hedging Activities - Schedule of Derivative Contracts Volume and Prices (Detail)	12 Months Ended
	Dec. 31, 2020 Boe MMBTU $ / MMBTU $ / bbl
Natural Gas Swap Contract
Derivative [Line Items]
Volume (in MMBTU) | MMBTU	208,333,140
Average price (in dollars per MMBTU)	2.54
Natural Gas Swap Contract | Swap Contracts for 2021
Derivative [Line Items]
Volume (in MMBTU) | MMBTU	197,383,140
Average price (in dollars per MMBTU)	2.54
Natural Gas Swap Contract | Swap Contracts for 2022
Derivative [Line Items]
Volume (in MMBTU) | MMBTU	10,950,000
Average price (in dollars per MMBTU)	2.53
Natural Gas Swap Contract | Swaption Swap Contracts 2021
Derivative [Line Items]
Volume (in MMBTU) | MMBTU	49,200,000
Average price (in dollars per MMBTU)	2.51
Natural Gas 2-Way Collar Contracts
Derivative [Line Items]
Volume (in MMBTU) | MMBTU	120,450,000
Ceiling, Average price (in dollars per MMBTU)	2.99
Floor, Average price (in dollars per MMBTU)	2.46
Natural Gas 2-Way Collar Contracts | Collar Contracts for 2021
Derivative [Line Items]
Volume (in MMBTU) | MMBTU	115,050,000
Ceiling, Average price (in dollars per MMBTU)	2.97
Floor, Average price (in dollars per MMBTU)	2.46
Natural Gas 2-Way Collar Contracts | Collar Contract for 2022
Derivative [Line Items]
Volume (in MMBTU) | MMBTU	5,400,000
Ceiling, Average price (in dollars per MMBTU)	3.48
Floor, Average price (in dollars per MMBTU)	2.53
Natural Gas Swaptions Contracts, in MMBTU
Derivative [Line Items]
Volume (in MMBTU) | MMBTU	65,700,000
Average price (in dollars per MMBTU)	2.51
Natural Gas Swaptions Contracts, in MMBTU | Swap Contracts for 2021
Derivative [Line Items]
Volume (in MMBTU) | MMBTU	16,500,000
Average price (in dollars per MMBTU)	2.50
Natural Gas Swaptions Contracts, in MMBTU | Swap Contracts for 2022
Derivative [Line Items]
Volume (in MMBTU) | MMBTU	49,200,000
Average price (in dollars per MMBTU)	2.51
Crude Oil Contracts, in Barrels
Derivative [Line Items]
Volume (in MMBTU) | Boe	182,500
Ceiling, Average price (in dollars per MMBTU) | $ / bbl	45.00
Floor, Average price (in dollars per MMBTU) | $ / bbl	40.00
Crude Oil Contracts, in Barrels | Collar Contracts for 2021
Derivative [Line Items]
Volume (in MMBTU) | Boe	182,500
Ceiling, Average price (in dollars per MMBTU) | $ / bbl	45.00
Floor, Average price (in dollars per MMBTU) | $ / bbl	40.00
Crude Oil Contracts, in Barrels | Collar Contract for 2022
Derivative [Line Items]
Volume (in MMBTU) | Boe	0
Ceiling, Average price (in dollars per MMBTU) | $ / bbl	0
Floor, Average price (in dollars per MMBTU) | $ / bbl	0
Natural Gas Swaptions Call Contracts | Swaption Contracts March 2021
Derivative [Line Items]
Volume (in MMBTU) | MMBTU	16,500,000
Average price (in dollars per MMBTU)	2.50
Natural Gas Swaptions Call Contracts | Swaption Contracts 2022
Derivative [Line Items]
Volume (in MMBTU) | MMBTU	49,200,000
Average price (in dollars per MMBTU)	2.51
Natural Gas Swaptions Call Contracts | Swaption Contracts March 2021
Derivative [Line Items]
Volume (in MMBTU) | MMBTU	5,400,000
Average price (in dollars per MMBTU)	2.50
Natural Gas Swaptions Call Contracts | Swaption Contracts October 2021
Derivative [Line Items]
Volume (in MMBTU) | MMBTU	36,500,000
Average price (in dollars per MMBTU)	2.52
Natural Gas Swaptions Call Contracts | Swaption Contracts November 2021
Derivative [Line Items]
Volume (in MMBTU) | MMBTU	7,300,000
Average price (in dollars per MMBTU)	2.50

X

- 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.

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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.

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- Definition

The average forward price on the group of price risk forward or futures contracts, such as gas futures contracts.

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

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