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Acquisitions and Dispositions - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015 Trust Partnership	Mar. 31, 2014
Business Combinations [Abstract]
Number of limited partnerships	18pnrg_NumberOfLimitedPartnerships
Number of business income trusts	2pnrg_NumberOfBusinessIncomeTrusts
Purchase of non-controlling interests	$ 1us-gaap_PaymentsForRepurchaseOfRedeemableNoncontrollingInterest	$ 48us-gaap_PaymentsForRepurchaseOfRedeemableNoncontrollingInterest

X

- Definition

Number of business income trusts.

+ References

No definition available.

+ Details

Name:	pnrg_NumberOfBusinessIncomeTrusts
Namespace Prefix:	pnrg_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of limited partnerships.

+ References

No definition available.

+ Details

Name:	pnrg_NumberOfLimitedPartnerships
Namespace Prefix:	pnrg_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Details

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

X

- Definition

The cash outflow during the period for redemption of redeemable noncontrolling interests.

+ References

No definition available.

+ Details

Name:	us-gaap_PaymentsForRepurchaseOfRedeemableNoncontrollingInterest
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration