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Supplementary Information - Results of Operations from Oil and Gas Producing Activities (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Revenue:    
Oil and gas sales $ 36,973 $ 84,015
Costs and Expenses:    
Lease operating expenses 23,028 33,461
Depreciation, depletion and accretion 25,921 34,616
Income tax expense (2,515) 1,421
Total Costs and Expenses 46,434 69,498
Results of Operations from Producing Activities (excluding corporate overhead and interest costs) $ (9,461) $ 14,517