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Related Party Transactions - Additional Information (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Related Party Transaction [Line Items] |  |
Repurchase interests of partners and trust unit holders | $ 274,000 us-gaap_PaymentsForRepurchaseOfRedeemableNoncontrollingInterest | $ 48,000 us-gaap_PaymentsForRepurchaseOfRedeemableNoncontrollingInterest
Treasury stock, shares | 1,502,993 us-gaap_TreasuryStockShares | 1,447,613 us-gaap_TreasuryStockShares
Treasury stock | 43,527,000 us-gaap_TreasuryStockValue | 40,251,000 us-gaap_TreasuryStockValue
Board of Directors [Member] |  |
Related Party Transaction [Line Items] |  |
Treasury stock, shares |  | 4,500 us-gaap_TreasuryStockShares / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_BoardOfDirectorsChairmanMember
Treasury stock |  | $ 222,750 us-gaap_TreasuryStockValue / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_BoardOfDirectorsChairmanMember
Other Related Party [Member] |  |
Related Party Transaction [Line Items] |  |
Treasury stock, shares | 0 us-gaap_TreasuryStockShares / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = pnrg_OtherRelatedPartyMember | 0 us-gaap_TreasuryStockShares / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = pnrg_OtherRelatedPartyMember

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- Definition The cash outflow during the period for redemption of redeemable noncontrolling interests. + References No definition available. + Details
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Period Type: | duration

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- Details
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- Definition Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28,29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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- Definition The amount allocated to treasury stock. Treasury stock is common and preferred shares of an entity that were issued, repurchased by the entity, and are held in its treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23315-112656 + Details
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- Details
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- Details
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