Derivative Instruments (Details 4) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2012	Jun. 30, 2012
Effect of Non-designated Derivative Instruments on the Consolidated Statement of Operations
Amount of Unrealized Loss Recognized in Other Income (expense)	$ (375)	$ (375)

Amount of unrealized loss recognized in other income (expense).

No definition available.

Name:	pq_AmountOfUnrealizedLossRecognizedInOtherIncomeExpense
Namespace Prefix:	pq_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration