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Acquisitions and Dispositions - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Business Combinations [Abstract]
Purchase of non-controlling interests	$ 48	$ 149

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- Definition

Purchase of non controlling interests.

+ References

No definition available.

+ Details

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

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- Details

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