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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, 2014 | Dec. 31, 2013
Revenue: |  |
Oil and gas sales | $ 91,045 us-gaap_ResultsOfOperationsRevenueFromOilAndGasProducingActivities | $ 92,785 us-gaap_ResultsOfOperationsRevenueFromOilAndGasProducingActivities
Costs and Expenses: |  |
Lease operating expenses | 43,972 us-gaap_ResultsOfOperationsProductionOrLiftingCosts | 43,809 us-gaap_ResultsOfOperationsProductionOrLiftingCosts
Exploration costs |  | 8 us-gaap_ResultsOfOperationsExplorationExpense
Depreciation, depletion and accretion | 22,906 us-gaap_ResultsOfOperationsDepreciationDepletionAndAmortizationAndValuationProvisions | 19,218 us-gaap_ResultsOfOperationsDepreciationDepletionAndAmortizationAndValuationProvisions
Income tax expense | 9,216 us-gaap_ResultsOfOperationsIncomeTaxExpense | 10,012 us-gaap_ResultsOfOperationsIncomeTaxExpense
Total Costs and Expenses | 76,094 pnrg_ResultsOfOperationsExpenseIncludingIncomeTaxExpenseFromOilAndGasProducingActivities | 73,047 pnrg_ResultsOfOperationsExpenseIncludingIncomeTaxExpenseFromOilAndGasProducingActivities
Results of Operations From Producing Activities (excluding corporate overhead and interest costs) | $ 14,951 us-gaap_ResultsOfOperationsOilAndGasProducingActivitiesNetIncomeExcludingCorporateOverheadAndInterestCosts | $ 19,738 us-gaap_ResultsOfOperationsOilAndGasProducingActivitiesNetIncomeExcludingCorporateOverheadAndInterestCosts

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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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- Definition The results of operations for oil and gas producing activities, excluding corporate overhead and interest costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62299-109447 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 23 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62136-109447 + Details
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- Definition Production (lifting) costs from oil and gas producing activities, including but not limited to lease operating expense, production and ad valorem taxes, and transportation expense. + 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 (b) -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62136-109447 + Details
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- Definition Total revenues 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 (a) -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62136-109447 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62246-109447 + Details
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