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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Derivative Contracts Volume and Prices (Detail)	6 Months Ended
	Jun. 30, 2021 MMBTU $ / MMBTU $ / bbl bbl
Natural Gas Swap Contracts:
Derivative [Line Items]
Volume (in MMBTU) | MMBTU	180,090,000
Average price (in dollars per MMBtu)	2.62
Natural Gas Swap Contracts: | Swap Contracts For Remainder Of Fiscal Year
Derivative [Line Items]
Volume (in MMBTU) | MMBTU	105,340,000
Average price (in dollars per MMBtu)	2.53
Natural Gas Swap Contracts: | Swap Contracts for 2022
Derivative [Line Items]
Volume (in MMBTU) | MMBTU	74,750,000
Average price (in dollars per MMBtu)	2.75
Natural Gas Swap Contracts: | Swaption Swap Contracts 2021
Derivative [Line Items]
Volume (in MMBTU) | MMBTU	22,080,000
Average price (in dollars per MMBtu)	2.51
Natural Gas Swap Contracts: | Swap Contracts for 2023
Derivative [Line Items]
Volume (in MMBTU) | MMBTU	0
Average price (in dollars per MMBtu)	0
Natural Gas Collar Contracts:
Derivative [Line Items]
Volume (in MMBTU) | MMBTU	188,160,000
Average Ceiling	3.29
Average Floor	2.50
Natural Gas Collar Contracts: | Collar Contract For Remainder Of Fiscal Year
Derivative [Line Items]
Volume (in MMBTU) | MMBTU	74,210,000
Average Ceiling	3.04
Average Floor	2.47
Natural Gas Collar Contracts: | Collar Contracts for 2022
Derivative [Line Items]
Volume (in MMBTU) | MMBTU	109,450,000
Average Ceiling	3.44
Average Floor	2.52
Natural Gas Collar Contracts: | Collar Contracts for 2023
Derivative [Line Items]
Volume (in MMBTU) | MMBTU	4,500,000
Average Ceiling	3.67
Average Floor	2.50
Natural Gas Swaptions Contracts:
Derivative [Line Items]
Volume (in MMBTU) | MMBTU	43,800,000
Average price (in dollars per MMBtu)	2.51
Natural Gas Swaptions Contracts: | Swap Contracts for 2022
Derivative [Line Items]
Volume (in MMBTU) | MMBTU	43,800,000
Average price (in dollars per MMBtu)	2.51
Natural Gas Swaptions Contracts: | Swaption Contracts 2022
Derivative [Line Items]
Volume (in MMBTU) | MMBTU	43,800,000
Average price (in dollars per MMBtu)	2.51
Natural Gas Swaptions 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 Contracts: | Swaption Contracts November 2021
Derivative [Line Items]
Volume (in MMBTU) | MMBTU	7,300,000
Average price (in dollars per MMBtu)	2.50
Natural Gas Swaptions Contracts: | Swap Contracts for 2023
Derivative [Line Items]
Volume (in MMBTU) | MMBTU	0
Average price (in dollars per MMBtu)	0
Natural Gas Basis Swap Contracts:
Derivative [Line Items]
Volume (in MMBTU) | MMBTU	18,310,000
Average price (in dollars per MMBtu)	(0.14)
Natural Gas Basis Swap Contracts: | Swap Contracts For Remainder Of Fiscal Year
Derivative [Line Items]
Volume (in MMBTU) | MMBTU	7,360,000
Average price (in dollars per MMBtu)	(0.12)
Natural Gas Basis Swap Contracts: | Swap Contracts for 2022
Derivative [Line Items]
Volume (in MMBTU) | MMBTU	10,950,000
Average price (in dollars per MMBtu)	(0.16)
Crude Oil Collar Contracts:
Derivative [Line Items]
Volume (in Barrels) | bbl	276,000
Average Ceiling | $ / bbl	51.67
Average Floor | $ / bbl	41.67
Crude Oil Collar Contracts: | Collar Contract For Remainder Of Fiscal Year
Derivative [Line Items]
Volume (in Barrels) | bbl	276,000
Average Ceiling | $ / bbl	51.67
Average Floor | $ / bbl	41.67

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.

+ References

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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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- Definition

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

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

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

+ References

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- Definition

Nominal volume used to calculate payments on a derivative instrument.

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