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Supplemental Disclosures about Oil and Natural Gas Producing Properties (unaudited) - Schedule of NYMEX Prices Used in Determining Future Cash Flows (Details)
 3 Months Ended 6 Months Ended 12 Months Ended
Sep. 30, 2020
$ / bbl
Dec. 31, 2020
$ / bbl
Jun. 30, 2021
$ / bbl
Jun. 30, 2020
$ / MMBtu
$ / bbl
Oil (per barrel)        
Average Sales Price and Production Costs Per Unit of Production [Line Items]        
Commodity Prices Used in Determining Future Cash Flows (in USD per barrel) 43.63 39.54 49.72 47.37
Gas (per million BTU)        
Average Sales Price and Production Costs Per Unit of Production [Line Items]        
Commodity Prices Used in Determining Future Cash Flows (in USD per barrel)     2.46 0