XML 23 R37.htm IDEA: XBRL DOCUMENT v2.4.0.8

Business Combinations (Details)	9 Months Ended
	Sep. 30, 2014 item	Sep. 30, 2013 item
Hertz car rental franchise
Business combinations
Number of acquired franchises		1
Automotive retail franchise
Business combinations
Number of acquired franchises	2	1

X

- Definition

Number of franchises acquired.

+ References

No definition available.

+ Details

Name:	pag_NumberOfFranchisesAcquired
Namespace Prefix:	pag_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Details

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