Commitments and Contingencies - Additional Information (Detail) $ in Thousands	1 Months Ended		9 Months Ended
	Oct. 31, 2020 bbl	Apr. 30, 2020 bbl	Sep. 30, 2020 USD ($) bbl	Oct. 01, 2020 USD ($)
Commitments and Contingencies Disclosure [Line Items]
Number of barrels | bbl			8,000
Asset Retirement Obligation			$ 5,300
Demobilization of Rigs			2,000
Rig Prepayment			1,000
Frac Service Prepayment			2,000
Estimated Litigation Liability, Current			$ 100
Gonzales, Lavaca and Fayette Counties, Texas
Commitments and Contingencies Disclosure [Line Items]
Number of barrels | bbl			20,000
Crude Oil Storage Capacity | Nuevo G&T
Commitments and Contingencies Disclosure [Line Items]
Number of barrels | bbl			180,000
Remaining obligation under agreement			$ 100
Crude Oil Storage Capacity | Nuevo G&T | Forecast [Member]
Commitments and Contingencies Disclosure [Line Items]
Number of barrels | bbl	70,000
Crude Oil Gathering And Transportation Services
Commitments and Contingencies Disclosure [Line Items]
Contractual Obligation, Remainder of 2020			3,200
Contractual Obligation, Due 2021 through 2025			13,000
Contractual Obligation, Due 2026			7,400
Contractual Obligation, Due 2027 through 2030			3,800
Contractual Obligation, Due 2031			2,200
Crude Oil Storage Capacity with Downstream Interstate Pipeline | Nuevo G&T
Commitments and Contingencies Disclosure [Line Items]
Number of barrels | bbl		90,000
Remaining obligation under agreement			$ 100
Crude Oil Storage Capacity with Downstream Interstate Pipeline | Nuevo G&T | Forecast [Member]
Commitments and Contingencies Disclosure [Line Items]
Remaining obligation under agreement				$ 100