Property and Equipment (Details Textual) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Property, Plant and Equipment [Abstract]
Capitalized interest is included in buildings and leasehold improvements	$ 27,500	$ 27,600

Capitalized interest included in buildings and leasehold improvements.

No definition available.

Name:	pag_CapitalizedInterestIncludedInBuildingsAndLeaseHoldImprovements
Namespace Prefix:	pag_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant