Derivative Instruments - Commodity Derivative Positions (Detail)	Sep. 30, 2021 bbl $ / bbl
Crude Oil | Swap | Fourth Quarter 2021 [Domain]
Derivative Instruments Related to Oil and Gas Production [Line Items]
Derivative, Swap Type, Average Fixed Price	45.54
Derivative, Nonmonetary Notional Amount | bbl	815
Crude Oil | Swap | Third Quarter 2023
Derivative Instruments Related to Oil and Gas Production [Line Items]
Derivative, Swap Type, Average Fixed Price	58.75
Derivative, Nonmonetary Notional Amount | bbl	457
Crude Oil | Swap | Fourth Quarter 2023
Derivative Instruments Related to Oil and Gas Production [Line Items]
Derivative, Swap Type, Average Fixed Price	58.75
Derivative, Nonmonetary Notional Amount | bbl	457
Crude Oil | Swap | First Quarter 2024
Derivative Instruments Related to Oil and Gas Production [Line Items]
Derivative, Swap Type, Average Fixed Price	58.75
Derivative, Nonmonetary Notional Amount | bbl	462
Crude Oil | Swap | Second Quarter 2024
Derivative Instruments Related to Oil and Gas Production [Line Items]
Derivative, Swap Type, Average Fixed Price	58.75
Derivative, Nonmonetary Notional Amount | bbl	308
Crude Oil | 2-Way Collars [Domain] | Fourth Quarter 2021 [Domain]
Derivative Instruments Related to Oil and Gas Production [Line Items]
Derivative, Average Floor Price	51.40
Derivative, Average Cap Price	62.23
Derivative, Nonmonetary Notional Amount | bbl	16,304
Crude Oil | 2-Way Collars [Domain] | First Quarter 2022
Derivative Instruments Related to Oil and Gas Production [Line Items]
Derivative, Average Floor Price	53.94
Derivative, Average Cap Price	66.25
Derivative, Nonmonetary Notional Amount | bbl	13,750
Crude Oil | 2-Way Collars [Domain] | Second Quarter 2022
Derivative Instruments Related to Oil and Gas Production [Line Items]
Derivative, Average Floor Price	47.37
Derivative, Average Cap Price	60.87
Derivative, Nonmonetary Notional Amount | bbl	7,830
Crude Oil | 2-Way Collars [Domain] | Third Quarter 2022
Derivative Instruments Related to Oil and Gas Production [Line Items]
Derivative, Average Floor Price	44.00
Derivative, Average Cap Price	58.36
Derivative, Nonmonetary Notional Amount | bbl	6,114
Crude Oil | 2-Way Collars [Domain] | Fourth Quarter 2022
Derivative Instruments Related to Oil and Gas Production [Line Items]
Derivative, Average Floor Price	40.00
Derivative, Average Cap Price	52.47
Derivative, Nonmonetary Notional Amount | bbl	4,484
Crude Oil | 2-Way Collars [Domain] | First Quarter 2023
Derivative Instruments Related to Oil and Gas Production [Line Items]
Derivative, Average Floor Price	40.00
Derivative, Average Cap Price	50.00
Derivative, Nonmonetary Notional Amount | bbl	2,917
Crude Oil | 2-Way Collars [Domain] | Second Quarter 2023
Derivative Instruments Related to Oil and Gas Production [Line Items]
Derivative, Average Floor Price	40.00
Derivative, Average Cap Price	50.00
Derivative, Nonmonetary Notional Amount | bbl	2,885
Crude Oil | CMA Roll Basis Swap [Domain] | Fourth Quarter 2021 [Domain]
Derivative Instruments Related to Oil and Gas Production [Line Items]
Derivative, CMA Roll Basis Swap, Price	0.168
Derivative, Nonmonetary Notional Amount | bbl	17,935
Crude Oil | CMA Roll Basis Swap [Domain] | First Quarter 2022
Derivative Instruments Related to Oil and Gas Production [Line Items]
Derivative, CMA Roll Basis Swap, Price	0.625
Derivative, Nonmonetary Notional Amount | bbl	6,667
Crude Oil | CMA Roll Basis Swap [Domain] | Second Quarter 2022
Derivative Instruments Related to Oil and Gas Production [Line Items]
Derivative, CMA Roll Basis Swap, Price	0.625
Derivative, Nonmonetary Notional Amount | bbl	6,593
Crude Oil | Purchased Put [Domain] | Fourth Quarter 2021 [Domain]
Derivative Instruments Related to Oil and Gas Production [Line Items]
Derivative, Nonmonetary Notional Amount | bbl	3,261
Natural Gas [Member] | Swap | Fourth Quarter 2021 [Domain]
Derivative Instruments Related to Oil and Gas Production [Line Items]
Derivative, Swap Type, Average Fixed Price	3.540
Derivative, Nonmonetary Notional Amount | bbl	6,739
Natural Gas [Member] | 2-Way Collars [Domain] | Fourth Quarter 2021 [Domain]
Derivative Instruments Related to Oil and Gas Production [Line Items]
Derivative, Average Floor Price	2.607
Derivative, Average Cap Price	3.117
Derivative, Nonmonetary Notional Amount | bbl	9,783
Derivative, Average Purchased Put Price	55.00
Natural Gas [Member] | 2-Way Collars [Domain] | First Quarter 2022
Derivative Instruments Related to Oil and Gas Production [Line Items]
Derivative, Average Floor Price	4.150
Derivative, Average Cap Price	5.750
Derivative, Nonmonetary Notional Amount | bbl	3,333
Natural Gas [Member] | 2-Way Collars [Domain] | Second Quarter 2022
Derivative Instruments Related to Oil and Gas Production [Line Items]
Derivative, Average Floor Price	2.500
Derivative, Average Cap Price	3.220
Derivative, Nonmonetary Notional Amount | bbl	13,187
Natural Gas [Member] | 2-Way Collars [Domain] | Third Quarter 2022
Derivative Instruments Related to Oil and Gas Production [Line Items]
Derivative, Average Floor Price	2.500
Derivative, Average Cap Price	3.220
Derivative, Nonmonetary Notional Amount | bbl	13,043
Natural Gas [Member] | 2-Way Collars [Domain] | Fourth Quarter 2022
Derivative Instruments Related to Oil and Gas Production [Line Items]
Derivative, Average Floor Price	2.500
Derivative, Average Cap Price	3.220
Derivative, Nonmonetary Notional Amount | bbl	13,043
Natural Gas [Member] | 2-Way Collars [Domain] | Second Quarter 2023
Derivative Instruments Related to Oil and Gas Production [Line Items]
Derivative, Average Floor Price	2.500
Derivative, Average Cap Price	2.682
Derivative, Nonmonetary Notional Amount | bbl	11,538
Natural Gas [Member] | 2-Way Collars [Domain] | Third Quarter 2023
Derivative Instruments Related to Oil and Gas Production [Line Items]
Derivative, Average Floor Price	2.500
Derivative, Average Cap Price	2.682
Derivative, Nonmonetary Notional Amount | bbl	11,413
Natural Gas [Member] | 2-Way Collars [Domain] | Fourth Quarter 2023
Derivative Instruments Related to Oil and Gas Production [Line Items]
Derivative, Average Floor Price	2.500
Derivative, Average Cap Price	2.682
Derivative, Nonmonetary Notional Amount | bbl	11,413
Natural Gas [Member] | 2-Way Collars [Domain] | First Quarter 2024
Derivative Instruments Related to Oil and Gas Production [Line Items]
Derivative, Average Floor Price	2.500
Derivative, Average Cap Price	3.650
Derivative, Nonmonetary Notional Amount | bbl	11,538
Natural Gas [Member] | 2-Way Collars [Domain] | Second Quarter 2024
Derivative Instruments Related to Oil and Gas Production [Line Items]
Derivative, Average Floor Price	2.328
Derivative, Average Cap Price	3.000
Derivative, Nonmonetary Notional Amount | bbl	11,538
Natural Gas [Member] | Sold Put | Fourth Quarter 2021 [Domain]
Derivative Instruments Related to Oil and Gas Production [Line Items]
Derivative, Swap Type, Average Fixed Price	2.000
Derivative, Nonmonetary Notional Amount | bbl	6,522
Natural Gas Liquids | Swap | Second Quarter 2022
Derivative Instruments Related to Oil and Gas Production [Line Items]
Derivative, Swap Type, Average Fixed Price	0.2500
Derivative, Nonmonetary Notional Amount | bbl	28,022
Natural Gas Liquids | Swap | Third Quarter 2022
Derivative Instruments Related to Oil and Gas Production [Line Items]
Derivative, Swap Type, Average Fixed Price	0.2500
Derivative, Nonmonetary Notional Amount | bbl	27,717
Natural Gas Liquids | Swap | Fourth Quarter 2022
Derivative Instruments Related to Oil and Gas Production [Line Items]
Derivative, Swap Type, Average Fixed Price	0.2500
Derivative, Nonmonetary Notional Amount | bbl	27,717
Natural Gas Liquids | Swap | Second Quarter 2023
Derivative Instruments Related to Oil and Gas Production [Line Items]
Derivative, Swap Type, Average Fixed Price	0.2288
Derivative, Nonmonetary Notional Amount | bbl	98,901
Natural Gas Liquids | Swap | Third Quarter 2023
Derivative Instruments Related to Oil and Gas Production [Line Items]
Derivative, Swap Type, Average Fixed Price	0.2275
Derivative, Nonmonetary Notional Amount | bbl	34,239
Natural Gas Liquids | Swap | Fourth Quarter 2023
Derivative Instruments Related to Oil and Gas Production [Line Items]
Derivative, Swap Type, Average Fixed Price	0.2275
Derivative, Nonmonetary Notional Amount | bbl	34,239
Natural Gas Liquids | Swap | First Quarter 2024
Derivative Instruments Related to Oil and Gas Production [Line Items]
Derivative, Swap Type, Average Fixed Price	0.2275
Derivative, Nonmonetary Notional Amount | bbl	34,615