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Description of Operations and Significant Accounting Policies - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2014 Trust Well Partnership
Property, Plant and Equipment [Line Items]
Number of wells operating by the company	1,600us-gaap_ProductiveOilWellsNumberOfWellsGross
Number of wells under non-operating interests	700us-gaap_ProductiveOilWellsNumberOfWellsNet
Number of limited partnerships	18pnrg_NumberOfLimitedPartnerships
Number of business income trusts	2pnrg_NumberOfBusinessIncomeTrusts
Maximum maturity period of cash and cash equivalents	90 days
Maximum [Member]
Property, Plant and Equipment [Line Items]
Depreciation period of equipment	10 years
Minimum [Member]
Property, Plant and Equipment [Line Items]
Depreciation period of equipment	5 years

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- Definition

Maximum Maturities Period Of Cash And Cash Equivalents

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- Definition

Number of business income trusts.

+ References

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- Definition

Number of limited partnerships.

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- Definition

The total number of producing oil wells and oil wells capable of production, in which the entity owns an undivided working interest.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Industry Guide

-Number 2

-Paragraph 4

-Subparagraph A

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- Definition

The total number of producing oil wells and oil wells capable of production, in which the entity owns a fractional working interest.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Name Industry Guide

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- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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