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Supplementary Information - Results of Operations from Oil and Gas Producing Activities (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Revenue:    
Oil and gas sales $ 38,306 $ 45,632
Costs and Expenses:    
Lease operating expenses 27,544 35,206
Depreciation, depletion and accretion 27,534 28,531
Income tax (benefit) expense (5,870) (6,156)
Total Costs and Expenses 49,208 57,581
Results of Operations From Producing Activities (excluding corporate overhead and interest costs) $ (10,902) $ (11,949)