XML 21 R55.htm IDEA: XBRL DOCUMENT v2.4.1.9

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

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

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- Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	duration

X

- 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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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- 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

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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- Details

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X

- Details

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