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CONSOLIDATED CONDENSED STATEMENTS OF CASH FLOWS (Parenthetical) (USD $) In Millions, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2014 | Mar. 31, 2013
CONSOLIDATED STATEMENTS OF CASH FLOWS |  |
Dealership acquisitions net, repayment of sellers' floor plan notes payable | $ 22.4 | $ 0

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- Definition Repayment of sellers' floor plan notes payable, dealership acquisitions. + References No definition available. + Details
Name: | pag_RepaymentOfSellersFloorPlanNotesPayableDealershipAcquisitions
Namespace Prefix: | pag_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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