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Supplementary Information - Results of Operations from Oil and Gas Producing Activities (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Revenue:    
Oil and gas sales $ 92,785 $ 88,336
Costs and Expenses:    
Lease operating expenses 43,809 39,868
Exploration costs 8 10
Depreciation, depletion and accretion 19,218 19,883
Income tax expense 10,012 8,941
Total Costs and Expenses 73,047 68,702
Results of Operations From Producing Activities (excluding corporate overhead and interest costs) $ 19,738 $ 19,634