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Business Combinations - Activity (Details) | 9 Months Ended
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Sep. 30, 2021 item
Business combinations |
Number of acquired franchises | 1
KCFL |
Business combinations |
Number of full service dealerships added | 4
Number of parts and service centers added | 4
Number of collision centers added | 2

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- Definition Number of collision centers added. + References No definition available. + Details
Name: | pag_NumberOfCollisionCentersAdded
Namespace Prefix: | pag_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- 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
- Definition Number of full service dealerships added to existing operations. + References No definition available. + Details
Name: | pag_NumberOfFullServiceDealershipsAdded
Namespace Prefix: | pag_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of parts and service centers added. + References No definition available. + Details
Name: | pag_NumberOfPartsAndServiceCentersAdded
Namespace Prefix: | pag_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition 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. + References No definition available. + Details
Name: | us-gaap_BusinessAcquisitionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_BusinessAcquisitionAxis=pag_KansasCityFreightlinerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |