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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
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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

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- Definition Depreciation, depletion and amortization, and valuation provisions (impairments) related to oil and gas producing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 23 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62136-109447 + Details
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- Definition Exploration costs from oil and gas producing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 23 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62136-109447 + Details
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