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Business Combinations (Details)
 3 Months Ended
Mar. 31, 2015
item
Mar. 31, 2014
item
Retail Automotive Franchise    
Business combinations    
Number of acquired franchises 1pag_NumberOfFranchisesAcquired
/ us-gaap_BusinessAcquisitionAxis
= pag_AutomotiveRetailFranchisesMember		 1pag_NumberOfFranchisesAcquired
/ us-gaap_BusinessAcquisitionAxis
= pag_AutomotiveRetailFranchisesMember
Retail Commercial Truck Dealership    
Business combinations    
Number of acquired franchises 2pag_NumberOfFranchisesAcquired
/ us-gaap_BusinessAcquisitionAxis
= pag_RetailCommercialTruckDealershipMember