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Restricted Cash and Cash Equivalents - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
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Cash And Cash Equivalents [Abstract] |  |
Restricted cash and cash equivalents pertaining to oil and gas revenue payments | $ 3.31 | $ 4.44

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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