Intangible Assets - Activity (Details)	3 Months Ended
Mar. 31, 2022 franchise
Retail Automotive Franchise
Intangible assets
Number of franchises disposed	0

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

Name:	pag_IndefiniteLivedIntangibleAssetsIncludingGoodwillByMajorClassLineItems
Namespace Prefix:	pag_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration