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Inventories (Details 2) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Inventories |  |  |
Interest credits and advertising assistance | $ 39.9 pag_FloorPlanInterestCreditsAndAdvertisingAssistance | $ 34.1 pag_FloorPlanInterestCreditsAndAdvertisingAssistance | $ 30.5 pag_FloorPlanInterestCreditsAndAdvertisingAssistance

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- Definition Floor plan interest credits and advertising assistance received from vendors, which reduce the cost of sales. + References No definition available. + Details
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Namespace Prefix: | pag_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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