Commitments and Contingencies Disclosure [Line Items]

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Contractual Obligation, Due 2022 through 2025

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Contractual Obligation, Due 2026

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Contractual Obligation, Due 2027 through 2030

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Contractual Obligation, Due 2031

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Contractual Obligation, Remainder of the Current Year

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Frac Services Prepayment

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The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

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Carrying amount of reserve for known or estimated probable loss from litigation, which may include attorneys' fees and other litigation costs, which is expected to be paid within one year of the date of the statement of financial position.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Volume that must be purchased within the specified time period of the agreement to avoid penalties or unfavorable effects on pricing, among other adverse consequences.

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Amount of cost (reversal of cost) for pension and other postretirement benefits.

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Commitments and Contingencies - Additional Information (Detail) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) bbl	Jun. 30, 2020 USD ($)	Mar. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Commitments and Contingencies Disclosure [Line Items]
Number of barrels \| bbl			8,000
Asset Retirement Obligation	$ 5,800		$ 5,800			$ 5,500
Estimated Litigation Liability, Current	100		100			$ 100
Frac Services Prepayment	300		300		$ 12,000
Other Pension, Postretirement and Supplemental Plans [Member]
Commitments and Contingencies Disclosure [Line Items]
Pension and Other Postretirement Benefits Cost (Reversal of Cost)	100	$ 100	$ 100	$ 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
Crude Oil Gathering And Transportation Services
Commitments and Contingencies Disclosure [Line Items]
Contractual Obligation, Remainder of the Current Year	7,000		$ 7,000
Contractual Obligation, Due 2022 through 2025	13,900		13,900
Contractual Obligation, Due 2026	7,800		7,800
Contractual Obligation, Due 2027 through 2030	3,800		3,800
Contractual Obligation, Due 2031	$ 600		$ 600
Crude Oil Storage Capacity with Downstream Interstate Pipeline \| Nuevo G&T
Commitments and Contingencies Disclosure [Line Items]
Number of barrels \| bbl			90,000
Crude Oil Storage Capacity with Downstream Interstate Pipeline \| Nuevo Dos Gathering and Transportation, LLC-Marketing Affiliate
Commitments and Contingencies Disclosure [Line Items]
Number of barrels \| bbl			62,000
Tank Capacity \| Nuevo G&T
Commitments and Contingencies Disclosure [Line Items]
Number of barrels \| bbl			70,000
Additional Crude Oil Storage Capacity With Downstream Interstate Pipeline \| Nuevo Dos Gathering and Transportation, LLC-Marketing Affiliate
Commitments and Contingencies Disclosure [Line Items]
Number of barrels \| bbl			120,000