Annual report pursuant to Section 13 and 15(d)

Commodity Derivative Positions (Detail)

v3.19.3.a.u2
Commodity Derivative Positions (Detail)
Dec. 31, 2019
bbl
$ / bbl
Fourth Quarter 2021 [Member] [Domain] | Put Option [Member] | Crude Oil  
Derivative Instruments Related to Oil and Gas Production [Line Items]  
Derivative, Swap Type, Fixed Price 44.00
Derivative, Nonmonetary Notional Amount | bbl 1,630
Fourth Quarter 2021 [Member] [Domain] | Swap [Member] | Crude Oil  
Derivative Instruments Related to Oil and Gas Production [Line Items]  
Derivative, Swap Type, Fixed Price 55.50
Derivative, Nonmonetary Notional Amount | bbl 1,630
Third Quarter 2021 [Member] [Domain] | Put Option [Member] | Crude Oil  
Derivative Instruments Related to Oil and Gas Production [Line Items]  
Derivative, Swap Type, Fixed Price 44.00
Derivative, Nonmonetary Notional Amount | bbl 1,630
Third Quarter 2021 [Member] [Domain] | Swap [Member] | Crude Oil  
Derivative Instruments Related to Oil and Gas Production [Line Items]  
Derivative, Swap Type, Fixed Price 55.50
Derivative, Nonmonetary Notional Amount | bbl 1,630
Second Quarter 2021 [Member] [Domain] | 3-Way Collars [Domain] | Crude Oil  
Derivative Instruments Related to Oil and Gas Production [Line Items]  
Derivative, Floor Price 55.00
Derivative, Cap Price 58.00
Derivative, Nonmonetary Notional Amount | bbl 1,648
Second Quarter 2021 [Member] [Domain] | Put Option [Member] | Crude Oil  
Derivative Instruments Related to Oil and Gas Production [Line Items]  
Derivative, Swap Type, Fixed Price 44.00
Derivative, Nonmonetary Notional Amount | bbl 4,945
Second Quarter 2021 [Member] [Domain] | Swap [Member] | Crude Oil  
Derivative Instruments Related to Oil and Gas Production [Line Items]  
Derivative, Swap Type, Fixed Price 55.89
Derivative, Nonmonetary Notional Amount | bbl 3,297
First Quarter 2021 [Member] [Domain] | 3-Way Collars [Domain] | Crude Oil  
Derivative Instruments Related to Oil and Gas Production [Line Items]  
Derivative, Floor Price 55.00
Derivative, Cap Price 58.00
Derivative, Nonmonetary Notional Amount | bbl 1,667
First Quarter 2021 [Member] [Domain] | Put Option [Member] | Crude Oil  
Derivative Instruments Related to Oil and Gas Production [Line Items]  
Derivative, Swap Type, Fixed Price 44.00
Derivative, Nonmonetary Notional Amount | bbl 5,000
First Quarter 2021 [Member] [Domain] | Swap [Member] | Crude Oil  
Derivative Instruments Related to Oil and Gas Production [Line Items]  
Derivative, Swap Type, Fixed Price 55.89
Derivative, Nonmonetary Notional Amount | bbl 3,333
Fourth Quarter 2020 [Member] | Swap [Member] | Crude Oil  
Derivative Instruments Related to Oil and Gas Production [Line Items]  
Derivative, Swap Type, Fixed Price 54.77
Derivative, Nonmonetary Notional Amount | bbl 10,630
Fourth Quarter 2020 [Member] | Swap [Member] | MEH [Member]  
Derivative Instruments Related to Oil and Gas Production [Line Items]  
Derivative, Swap Type, Fixed Price 61.03
Derivative, Nonmonetary Notional Amount | bbl 2,000
Third Quarter 2020 [Member] | 2-Way Collars [Domain] | Crude Oil  
Derivative Instruments Related to Oil and Gas Production [Line Items]  
Derivative, Floor Price 55.00
Derivative, Cap Price 58.42
Derivative, Nonmonetary Notional Amount | bbl 4,891
Third Quarter 2020 [Member] | Swap [Member] | Crude Oil  
Derivative Instruments Related to Oil and Gas Production [Line Items]  
Derivative, Swap Type, Fixed Price 54.77
Derivative, Nonmonetary Notional Amount | bbl 10,630
Third Quarter 2020 [Member] | Swap [Member] | MEH [Member]  
Derivative Instruments Related to Oil and Gas Production [Line Items]  
Derivative, Swap Type, Fixed Price 61.03
Derivative, Nonmonetary Notional Amount | bbl 2,000
Second Quarter 2020 [Member] | 2-Way Collars [Domain] | Crude Oil  
Derivative Instruments Related to Oil and Gas Production [Line Items]  
Derivative, Floor Price 55.00
Derivative, Cap Price 57.69
Derivative, Nonmonetary Notional Amount | bbl 3,297
Second Quarter 2020 [Member] | Swap [Member] | Crude Oil  
Derivative Instruments Related to Oil and Gas Production [Line Items]  
Derivative, Swap Type, Fixed Price 54.96
Derivative, Nonmonetary Notional Amount | bbl 12,648
Second Quarter 2020 [Member] | Swap [Member] | MEH [Member]  
Derivative Instruments Related to Oil and Gas Production [Line Items]  
Derivative, Swap Type, Fixed Price 61.03
Derivative, Nonmonetary Notional Amount | bbl 2,000
First Quarter 2020 [Member] | Swap [Member] | Crude Oil  
Derivative Instruments Related to Oil and Gas Production [Line Items]  
Derivative, Floor Price 48.00
Derivative, Cap Price 57.10
Derivative, Swap Type, Fixed Price 55.34
Derivative, Nonmonetary Notional Amount | bbl 15,648
First Quarter 2020 [Member] | Swap [Member] | MEH [Member]  
Derivative Instruments Related to Oil and Gas Production [Line Items]  
Derivative, Swap Type, Fixed Price 61.03
Derivative, Nonmonetary Notional Amount | bbl 2,000