Oil and Gas Exploration and Production Industries Disclosures (Details 2) (USD $)	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Proved developed and undeveloped reserves (Present value before income taxes)	$ 13,712,000	$ 18,439,000	$ 13,068,000

This element represents the amount of discounted future net revenues of proved developed and undeveloped reserves before income tax.

No definition available.

Name:	pdo_DiscountedFutureNetRevenuesOfProvedDevelopedAndUndevelopedReservesBeforeIncomeTax
Namespace Prefix:	pdo_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration