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Floor Plan Notes Payable - Trade and Non-trade (Details) | 6 Months Ended
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Jun. 30, 2013
Floor Plan Notes Payable - Trade and Non-trade |
Maturity period of floor plan arrangements outside the U.S. if not payable on demand | 90 days

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- Definition The maximum period of original maturity for floor plans outside of the United States. + References No definition available. + Details
Name: | pag_FloorPlanNotesPayableForeignMaximumDuration
Namespace Prefix: | pag_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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