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Business Combinations (Details) | 9 Months Ended
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Sep. 30, 2012 item | Sep. 30, 2011 item
Business Combinations |  |
Number of acquired franchises | 21 | 3

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