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