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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

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- Definition Repurchase interests of partners and trust unit holders. + References No definition available. + Details
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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