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Supplementary Information - Results of Operations from Oil and Gas Producing Activities (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Revenue:    
Oil and gas sales $ 66,883 $ 38,306
Costs and Expenses:    
Lease operating expenses 30,880 27,544
Depreciation, depletion and accretion 34,006 27,534
Income tax (benefit) expense (7,753) (5,870)
Total Costs and Expenses 57,133 49,208
Results of Operations from Producing Activities (excluding corporate overhead and interest costs) $ 9,750 $ (10,902)