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Vehicle Financing (Details)	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Vehicle Financing
Maturity period of floor plan arrangements outside the U.S. if not payable on demand	90 days
Weighted average interest rate on floor plan borrowings (as a percent)	1.47%	1.79%

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

- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtWeightedAverageInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- References

No definition available.

+ Details

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