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Financial Instruments - Effect of Derivative Instruments on Consolidated Statements of Operations (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain/loss recognized in income	$ 17,420us-gaap_DerivativeGainLossOnDerivativeNet	$ (1,971)us-gaap_DerivativeGainLossOnDerivativeNet
Derivatives Designated as Cash-Flow Hedging Instruments [Member] | Interest Rate Swap [Member] | Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain/loss recognized in income	(289)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember / us-gaap_IncomeStatementLocationAxis = us-gaap_InterestExpenseMember
Derivatives Not Designated as Cash-Flow Hedging Instruments [Member] | Natural Gas Commodity Contracts [Member] | Unrealized Gain (Loss) on Derivative Instruments, Net [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain/loss recognized in income	2,542us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = pnrg_NaturalGasCommodityContractsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = pnrg_UnrealizedGainLossOnDerivativeInstrumentsNetMember	(1,309)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = pnrg_NaturalGasCommodityContractsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = pnrg_UnrealizedGainLossOnDerivativeInstrumentsNetMember
Derivatives Not Designated as Cash-Flow Hedging Instruments [Member] | Natural Gas Commodity Contracts [Member] | Realized Gain (Loss) on Derivative Instruments, Net [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain/loss recognized in income	(529)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = pnrg_NaturalGasCommodityContractsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = pnrg_RealizedGainLossOnDerivativeInstrumentsNetMember	796us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = pnrg_NaturalGasCommodityContractsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = pnrg_RealizedGainLossOnDerivativeInstrumentsNetMember
Derivatives Not Designated as Cash-Flow Hedging Instruments [Member] | Crude Oil Commodity Contracts [Member] | Unrealized Gain (Loss) on Derivative Instruments, Net [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain/loss recognized in income	15,032us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = pnrg_CrudeOilCommodityContractsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = pnrg_UnrealizedGainLossOnDerivativeInstrumentsNetMember	660us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = pnrg_CrudeOilCommodityContractsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = pnrg_UnrealizedGainLossOnDerivativeInstrumentsNetMember
Derivatives Not Designated as Cash-Flow Hedging Instruments [Member] | Crude Oil Commodity Contracts [Member] | Realized Gain (Loss) on Derivative Instruments, Net [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain/loss recognized in income	$ 664us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = pnrg_CrudeOilCommodityContractsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = pnrg_RealizedGainLossOnDerivativeInstrumentsNetMember	$ (2,118)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = pnrg_CrudeOilCommodityContractsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = pnrg_RealizedGainLossOnDerivativeInstrumentsNetMember

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- Definition

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4A

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5618551-113959



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4C

-Subparagraph (a),(c),(d),(e)

-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959

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