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Business Combinations (Details) | 6 Months Ended
--- | ---
Jun. 30, 2014 item | Jun. 30, 2013 item
Hertz car rental franchise |  |
Business combinations |  |
Number of acquired franchises |  | 1
Automotive retail franchise |  |
Business combinations |  |
Number of acquired franchises | 2 | 1

X
- 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

X
- Details
Name: | us-gaap_BusinessAcquisitionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration