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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Derivative Contracts Volume and Prices (Detail)
 9 Months Ended
Sep. 30, 2021
MMBTU
$ / bbl
$ / MMBTU
bbl
Natural Gas Swap Contracts:  
Derivative [Line Items]  
Volume (in MMBTU) | MMBTU 129,020,000
Average price (in dollars per MMBtu) 2.66
Natural Gas Swap Contracts: | Swap Contracts For Remainder Of Fiscal Year  
Derivative [Line Items]  
Volume (in MMBTU) | MMBTU 51,520,000
Average price (in dollars per MMBtu) 2.53
Natural Gas Swap Contracts: | Swap Contracts for 2022  
Derivative [Line Items]  
Volume (in MMBTU) | MMBTU 77,500,000
Average price (in dollars per MMBtu) 2.76
Natural Gas Swap Contracts: | Swaption Swap Contracts 2021  
Derivative [Line Items]  
Volume (in MMBTU) | MMBTU 11,040,000
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 185,085,000
Average ceiling (dollars per unit) 3.74
Average floor (dollars per unit) 2.60
Natural Gas Collar Contracts: | Collar Contract For Remainder Of Fiscal Year  
Derivative [Line Items]  
Volume (in MMBTU) | MMBTU 37,410,000
Average ceiling (dollars per unit) 3.05
Average floor (dollars per unit) 2.48
Natural Gas Collar Contracts: | Collar Contracts for 2022  
Derivative [Line Items]  
Volume (in MMBTU) | MMBTU 140,925,000
Average ceiling (dollars per unit) 3.91
Average floor (dollars per unit) 2.62
Natural Gas Collar Contracts: | Collar Contracts for 2023  
Derivative [Line Items]  
Volume (in MMBTU) | MMBTU 6,750,000
Average ceiling (dollars per unit) 4.03
Average floor (dollars per unit) 2.67
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 14,630,000
Average price (in dollars per MMBtu) (0.15)
Natural Gas Basis Swap Contracts: | Swap Contracts For Remainder Of Fiscal Year  
Derivative [Line Items]  
Volume (in MMBTU) | MMBTU 3,680,000
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 138,000
Average ceiling (dollars per unit) | $ / bbl 51.67
Average floor (dollars per unit) | $ / bbl 41.67
Crude Oil Collar Contracts: | Collar Contract For Remainder Of Fiscal Year  
Derivative [Line Items]  
Volume (in Barrels) | bbl 138,000
Average ceiling (dollars per unit) | $ / bbl 51.67
Average floor (dollars per unit) | $ / bbl 41.67