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Intangible Assets - Activity (Details) | 9 Months Ended
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Sep. 30, 2018 item
Retail Automotive Dealership |
Intangible assets |
Number of franchises sold | 6

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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 franchises disposed of by the entity during the period. + References No definition available. + Details
Name: | pag_NumberOfFranchisesDisposed
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: |