Supplemental Crude Oil and Natural Gas Information - Additional Information (Detail)	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Supplemental Crude Oil and Natural Gas Information [Abstract]
Percent of proved crude oil reserve estimates prepared by external reserve engineers	97.00%	99.00%	98.00%

Percent Of Total Proved Reserve Estimates Prepared By External Reserve Engineers

No definition available.

Name:	ck0000732834_PercentOfTotalProvedReserveEstimatesPreparedByExternalReserveEngineers
Namespace Prefix:	ck0000732834_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration