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Business Combinations - Activity (Details) - item | 3 Months Ended
--- | ---
Mar. 31, 2016 | Mar. 31, 2015
Retail Automotive Dealership |  |
Business combinations |  |
Number of acquired franchises | 1 | 1
Retail Commercial Truck Dealership |  |
Business combinations |  |
Number of dealerships acquired |  | 2

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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

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- Definition Represents the number of full service retail locations acquired. + References No definition available. + Details
Name: | pag_NumberOfFullServiceRetailLocationsAcquired
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_RetailAutomotiveDealershipMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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