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Floor Plan Notes Payable - Trade and Non-trade (Details)	9 Months Ended
	Sep. 30, 2012
Floor Plan Notes Payable - Trade and Non-trade
Maturity period of floor plan arrangements outside the U.S. if not payable on demand	90 days

X

- Definition

The maximum period of original maturity for floor plans outside of the United States.

+ References

No definition available.

+ Details

Name:	pag_FloorPlanNotesPayableForeignMaximumDuration
Namespace Prefix:	pag_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Details

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