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

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards expected to be realized or consumed within one year or operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=37586315&loc=d3e31917-109318 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=37586315&loc=d3e31931-109318 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=37586315&loc=d3e31938-109318 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Deferred Tax Asset -URI http://asc.fasb.org/extlink&oid=6510090 + Details
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