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Acquisitions and Dispositions - Additional Information (Detail) $ in Thousands	6 Months Ended
	Jun. 30, 2015 USD ($) Partnership Trust	Jun. 30, 2014 USD ($)
Business Combinations [Abstract]
Number of limited partnerships | Partnership	18
Number of business income trusts | Trust	2
Purchase of non-controlling interests	$ 5	$ 209

X

- Definition

Number of business income trusts.

+ References

No definition available.

+ Details

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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

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
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X

- Definition

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

+ References

No definition available.

+ Details

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