Inventories (Details Textuals) (USD $) In Thousands	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010
Inventories (Textuals) [Abstract]
Interest credits and advertising assistance	$ 16,267	$ 12,108

Name:

pag_FloorPlanInterestCreditsAndAdvertisingAssistance

Namespace Prefix:

pag

Data Type:

xbrli:monetaryItemType

Balance Type:

credit

Period Type:

duration