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Related Party Transactions - Additional Information (Detail) (USD $)	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Related Party Transactions [Abstract]
Repurchase interests of partners and trust unit holders	$ 7,000	$ 47,000

X

- Definition

Repurchase interests of partners and trust unit holders.

+ References

No definition available.

+ Details

Name:	pnrg_RepurchaseInterestsOfPartnersAndTrustUnitHolders
Namespace Prefix:	pnrg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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- Details

Name:	us-gaap_RelatedPartyTransactionsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration