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Inventories (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Inventories
Interest credits and advertising assistance	$ 10.9	$ 8.8	$ 30.6	$ 25.2

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- Definition

Floor plan interest credits and advertising assistance received from vendors, which reduce the cost of sales.

+ References

No definition available.

+ Details

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Namespace Prefix:	pag_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration