Quarterly report pursuant to Section 13 or 15(d)

Commodity Derivative Positions (Detail)

v3.20.2
Commodity Derivative Positions (Detail)
Sep. 30, 2020
bbl
$ / bbl
Crude Oil | Swap | Fourth Quarter 2020 [Member]  
Derivative Instruments Related to Oil and Gas Production [Line Items]  
Derivative, Swap Type, Average Fixed Price 57.59
Derivative, Nonmonetary Notional Amount | bbl 10,174
Crude Oil | Swap | First Quarter 2021 [Domain]  
Derivative Instruments Related to Oil and Gas Production [Line Items]  
Derivative, Swap Type, Average Fixed Price 55.89
Derivative, Nonmonetary Notional Amount | bbl 3,333
Crude Oil | Swap | Second Quarter 2021 [Domain]  
Derivative Instruments Related to Oil and Gas Production [Line Items]  
Derivative, Swap Type, Average Fixed Price 55.89
Derivative, Nonmonetary Notional Amount | bbl 3,297
Crude Oil | 2-Way Collars [Domain] | Fourth Quarter 2020 [Member]  
Derivative Instruments Related to Oil and Gas Production [Line Items]  
Derivative, Average Floor Price 48.00
Derivative, Average Cap Price 57.10
Derivative, Nonmonetary Notional Amount | bbl 2,000
Crude Oil | 2-Way Collars [Domain] | First Quarter 2021 [Domain]  
Derivative Instruments Related to Oil and Gas Production [Line Items]  
Derivative, Average Floor Price 44.50
Derivative, Average Cap Price 53.53
Derivative, Nonmonetary Notional Amount | bbl 6,667
Crude Oil | 2-Way Collars [Domain] | Second Quarter 2021 [Domain]  
Derivative Instruments Related to Oil and Gas Production [Line Items]  
Derivative, Average Floor Price 44.50
Derivative, Average Cap Price 53.53
Derivative, Nonmonetary Notional Amount | bbl 6,593
Crude Oil | 2-Way Collars [Domain] | Third Quarter 2021 [Domain]  
Derivative Instruments Related to Oil and Gas Production [Line Items]  
Derivative, Average Floor Price 40.67
Derivative, Average Cap Price 53.50
Derivative, Nonmonetary Notional Amount | bbl 4,891
Crude Oil | 2-Way Collars [Domain] | Fourth Quarter 2021 [Domain]  
Derivative Instruments Related to Oil and Gas Production [Line Items]  
Derivative, Average Floor Price 40.67
Derivative, Average Cap Price 53.50
Derivative, Nonmonetary Notional Amount | bbl 4,891
Crude Oil | Put Option | Fourth Quarter 2020 [Member]  
Derivative Instruments Related to Oil and Gas Production [Line Items]  
Derivative, Swap Type, Average Fixed Price 43.55
Derivative, Nonmonetary Notional Amount | bbl 3,783
Crude Oil | Put Option | First Quarter 2021 [Domain]  
Derivative Instruments Related to Oil and Gas Production [Line Items]  
Derivative, Swap Type, Average Fixed Price 36.93
Derivative, Nonmonetary Notional Amount | bbl 11,667
Crude Oil | Put Option | Second Quarter 2021 [Domain]  
Derivative Instruments Related to Oil and Gas Production [Line Items]  
Derivative, Swap Type, Average Fixed Price 36.93
Derivative, Nonmonetary Notional Amount | bbl 11,538
Crude Oil | Put Option | Third Quarter 2021 [Domain]  
Derivative Instruments Related to Oil and Gas Production [Line Items]  
Derivative, Swap Type, Average Fixed Price 35.00
Derivative, Nonmonetary Notional Amount | bbl 4,891
Crude Oil | Put Option | Fourth Quarter 2021 [Domain]  
Derivative Instruments Related to Oil and Gas Production [Line Items]  
Derivative, Swap Type, Average Fixed Price 35.00
Derivative, Nonmonetary Notional Amount | bbl 4,891
Crude Oil | Basis Swap [Domain] | Fourth Quarter 2020 [Member]  
Derivative Instruments Related to Oil and Gas Production [Line Items]  
Derivative, Swap Type, Average Fixed Price 1.31
Derivative, Nonmonetary Notional Amount | bbl 6,348
Crude Oil | CMA Roll Basis Swap [Domain] | Fourth Quarter 2020 [Member]  
Derivative Instruments Related to Oil and Gas Production [Line Items]  
Derivative, CMA Roll Basis Swap, Price (0.42)
Derivative, Nonmonetary Notional Amount | bbl 2,174
Natural Gas [Member] | 2-Way Collars [Domain] | Fourth Quarter 2020 [Member]  
Derivative Instruments Related to Oil and Gas Production [Line Items]  
Derivative, Average Floor Price 2.00
Derivative, Average Cap Price 2.21
Derivative, Nonmonetary Notional Amount | bbl 12,804
Natural Gas [Member] | 2-Way Collars [Domain] | First Quarter 2021 [Domain]  
Derivative Instruments Related to Oil and Gas Production [Line Items]  
Derivative, Average Floor Price 2.61
Derivative, Average Cap Price 3.12
Derivative, Nonmonetary Notional Amount | bbl 10,000
Natural Gas [Member] | 2-Way Collars [Domain] | Second Quarter 2021 [Domain]  
Derivative Instruments Related to Oil and Gas Production [Line Items]  
Derivative, Average Floor Price 2.61
Derivative, Average Cap Price 3.12
Derivative, Nonmonetary Notional Amount | bbl 9,890
Natural Gas [Member] | 2-Way Collars [Domain] | Third Quarter 2021 [Domain]  
Derivative Instruments Related to Oil and Gas Production [Line Items]  
Derivative, Average Floor Price 2.61
Derivative, Average Cap Price 3.12
Derivative, Nonmonetary Notional Amount | bbl 9,783
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 2.61
Derivative, Average Cap Price 3.12
Derivative, Nonmonetary Notional Amount | bbl 9,783
Natural Gas [Member] | Put Option | First Quarter 2021 [Domain]  
Derivative Instruments Related to Oil and Gas Production [Line Items]  
Derivative, Swap Type, Average Fixed Price 2.00
Derivative, Nonmonetary Notional Amount | bbl 6,667
Natural Gas [Member] | Put Option | Second Quarter 2021 [Domain]  
Derivative Instruments Related to Oil and Gas Production [Line Items]  
Derivative, Swap Type, Average Fixed Price 2.00
Derivative, Nonmonetary Notional Amount | bbl 6,593
Natural Gas [Member] | Put Option | Third Quarter 2021 [Domain]  
Derivative Instruments Related to Oil and Gas Production [Line Items]  
Derivative, Swap Type, Average Fixed Price 2.00
Derivative, Nonmonetary Notional Amount | bbl 6,522
Natural Gas [Member] | Put Option | Fourth Quarter 2021 [Domain]  
Derivative Instruments Related to Oil and Gas Production [Line Items]  
Derivative, Swap Type, Average Fixed Price 2.00
Derivative, Nonmonetary Notional Amount | bbl 6,522