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Related Party Transactions (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Penske Corporation and its affiliates
Related party transactions
Provider's cost reimbursed	$ 7,300,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = pag_PenskeCorporationAndAffiliatesMember	$ 6,300,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = pag_PenskeCorporationAndAffiliatesMember	$ 5,300,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = pag_PenskeCorporationAndAffiliatesMember
Amount of Provider's cost received	56,000us-gaap_RevenueFromRelatedParties / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = pag_PenskeCorporationAndAffiliatesMember	24,000us-gaap_RevenueFromRelatedParties / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = pag_PenskeCorporationAndAffiliatesMember	31,000us-gaap_RevenueFromRelatedParties / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = pag_PenskeCorporationAndAffiliatesMember
Amount due from related party	14,000us-gaap_DueFromRelatedParties / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = pag_PenskeCorporationAndAffiliatesMember	0us-gaap_DueFromRelatedParties / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = pag_PenskeCorporationAndAffiliatesMember
Amount due to related party	700,000us-gaap_DueToRelatedPartiesCurrentAndNoncurrent / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = pag_PenskeCorporationAndAffiliatesMember	600,000us-gaap_DueToRelatedPartiesCurrentAndNoncurrent / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = pag_PenskeCorporationAndAffiliatesMember
Penske Truck Leasing Corporation and other subsidiaries
Related party transactions
General partner ownership percentage	41.10%us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPManagingMemberOrGeneralPartnerOwnershipInterest / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = pag_PenskeTruckLeasingCorporationAndSubsidiariesMember
Penske Truck Leasing Corporation and other subsidiaries | General Electric Capital Corporation
Related party transactions
General partner ownership percentage	49.90%us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPManagingMemberOrGeneralPartnerOwnershipInterest / dei_LegalEntityAxis = pag_GeneralElectricCapitalCorporationMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = pag_PenskeTruckLeasingCorporationAndSubsidiariesMember
Penske Truck Leasing Co., L.P.
Related party transactions
Ownership interest in Penske Truck Leasing Co (as a percent)	9.00%us-gaap_SubsidiaryOfLimitedLiabilityCompanyOrLimitedPartnershipOwnershipInterest / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_PartnershipInterestMember
Pro rata cash dividends received	11,600,000us-gaap_InvestmentIncomeDividend / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_PartnershipInterestMember	9,900,000us-gaap_InvestmentIncomeDividend / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_PartnershipInterestMember	18,500,000us-gaap_InvestmentIncomeDividend / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_PartnershipInterestMember
PCV US
Related party transactions
Purchase price	$ 58,800,000us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = pag_PcvU.s.Member

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