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