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Restricted Cash and Cash Equivalents - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Cash and Cash Equivalents [Abstract] |  |
Restricted cash and cash equivalents pertaining to oil and gas revenue payments | $ 3.88 pnrg_RestrictedCashAndCashEquivalentsPertainingToOilAndGasRevenuePayments | $ 2.01 pnrg_RestrictedCashAndCashEquivalentsPertainingToOilAndGasRevenuePayments

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- Definition Restricted cash and cash equivalents pertaining to oil and gas revenue payments. + References No definition available. + Details
Name: | pnrg_RestrictedCashAndCashEquivalentsPertainingToOilAndGasRevenuePayments
Namespace Prefix: | pnrg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_CashAndCashEquivalentsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration