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Business Combinations - Activity (Details) - item | 9 Months Ended
--- | ---
Sep. 30, 2020 | Sep. 30, 2019
Retail Commercial Truck Dealership |  |
Business combinations |  |
Number of retail locations acquired |  | 6
Commercial Vehicle Distribution |  |
Business combinations |  |
Number of dealerships acquired | 0 | 1

X
- Definition Represents the number of dealerships acquired. + References No definition available. + Details
Name: | pag_NumberOfDealershipsAcquired
Namespace Prefix: | pag_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the number of retail locations acquired. + References No definition available. + Details
Name: | pag_NumberOfRetailLocationsAcquired
Namespace Prefix: | pag_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- 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

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

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