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Income Taxes - Components of Net Deferred Tax Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Current Assets:
Accrued liabilities	$ 610us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities	$ 683us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities
Allowance for doubtful accounts	124us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts	118us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts
Derivative contracts	52pnrg_DeferredTaxAssetsDerivativeInstrumentsCurrent	677pnrg_DeferredTaxAssetsDerivativeInstrumentsCurrent
Total current assets	786us-gaap_DeferredTaxAssetsGrossCurrent	1,478us-gaap_DeferredTaxAssetsGrossCurrent
Current Liabilities:
Derivative contracts	6,333pnrg_DeferredTaxLiabilitiesDerivativeInstrumentsCurrent
Total current liabilities	6,333us-gaap_DeferredTaxLiabilitiesGrossCurrent
Net current deferred income tax liabilities (assets)	5,547us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent	(1,478)us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent
Non-Current Assets:
Alternative minimum tax credits	5,722us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax	5,852us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax
Net operating loss carry-forwards	620us-gaap_DeferredTaxAssetsOperatingLossCarryforwards	168us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Percentage depletion carry-forwards	3,959pnrg_DeferredTaxAssetsDepletionCarryforwards	4,543pnrg_DeferredTaxAssetsDepletionCarryforwards
Total non-current assets	10,301us-gaap_DeferredTaxAssetsGrossNoncurrent	10,563us-gaap_DeferredTaxAssetsGrossNoncurrent
Non-Current Liabilities:
Basis differences relating to managed partnerships	4,300pnrg_DeferredTaxLiabilitiesBasisDifferenceRelatedToManagedPartnerships	2,462pnrg_DeferredTaxLiabilitiesBasisDifferenceRelatedToManagedPartnerships
Depletion and depreciation	44,192us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment	39,694us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Derivative contracts		369us-gaap_DeferredTaxLiabilitiesDerivatives
Total non-current liabilities	48,492us-gaap_DeferredTaxLiabilitiesGrossNoncurrent	42,525us-gaap_DeferredTaxLiabilitiesGrossNoncurrent
Net non-current deferred income tax liabilities	$ 38,191us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent	$ 31,962us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent

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