Derivative Instruments (Details 1) (Commodity Contract, Designated as Hedging Instrument, USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Hedge Asset
Derivatives, Fair Value [Line Items]
Derivative asset	$ 1,519	$ 521
Hedge Liability
Derivatives, Fair Value [Line Items]
Derivative liability	$ (120)	$ (1,617)

Derivative Liability, Fair Value, Gross Liability, Current

No definition available.

Name:	pq_DerivativeLiabilityFairValueGrossLiabilityCurrent
Namespace Prefix:	pq_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant