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Business Combinations - Activity (Details) | 3 Months Ended
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Mar. 31, 2022 franchise
U.S. | Retail automotive dealership |
Business combinations |
Number of acquired franchises | 1

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- Definition Number of franchises acquired. + References No definition available. + Details
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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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_StatementGeographicalAxis=country_US
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=pag_RetailAutomotiveDealershipMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |