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Intangible Assets - Activity (Details) | 3 Months Ended
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Mar. 31, 2019 item
Retail Automotive Dealership |
Intangible assets |
Number of franchises sold | 6
Number of franchises terminated | 1
Commercial Vehicle Distribution |
Intangible assets |
Number of dealerships acquired | 1

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

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- 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 The number of franchises sold by the entity during the period. + References No definition available. + Details
Name: | pag_NumberOfFranchisesSold
Namespace Prefix: | pag_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition The number of franchises terminated by the entity during the period. + References No definition available. + Details
Name: | pag_NumberOfFranchisesTerminated
Namespace Prefix: | pag_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_FranchisorDisclosureAxis=pag_RetailAutomotiveDealershipOperationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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