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Real Estate Activities - Summary of Capitalized Salaries, Commissions and Benefits, Real Estate Taxes and Interest (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Salaries and benefits | Development/Redevelopment Activities [Member]    
Real Estate Capitalized Costs [Line Items]    
Real estate capitalized cost $ 154pei_RealEstateCapitalizedCost
/ us-gaap_NatureOfExpenseAxis
= pei_SalariesAndBenefitsMember
/ us-gaap_RealEstatePropertiesAxis
= pei_DevelopmentAndRedevelopmentActivitiesMember		 $ 394pei_RealEstateCapitalizedCost
/ us-gaap_NatureOfExpenseAxis
= pei_SalariesAndBenefitsMember
/ us-gaap_RealEstatePropertiesAxis
= pei_DevelopmentAndRedevelopmentActivitiesMember
Interest | Development/Redevelopment Activities [Member]    
Real Estate Capitalized Costs [Line Items]    
Real estate capitalized cost 35pei_RealEstateCapitalizedCost
/ us-gaap_NatureOfExpenseAxis
= us-gaap_InterestExpenseMember
/ us-gaap_RealEstatePropertiesAxis
= pei_DevelopmentAndRedevelopmentActivitiesMember		 103pei_RealEstateCapitalizedCost
/ us-gaap_NatureOfExpenseAxis
= us-gaap_InterestExpenseMember
/ us-gaap_RealEstatePropertiesAxis
= pei_DevelopmentAndRedevelopmentActivitiesMember
Salaries, commissions and benefits | Leasing Activities [Member]    
Real Estate Capitalized Costs [Line Items]    
Real estate capitalized cost $ 1,655pei_RealEstateCapitalizedCost
/ us-gaap_NatureOfExpenseAxis
= pei_SalariesAndBenefitsExpenseMember
/ us-gaap_RealEstatePropertiesAxis
= pei_LeasingActivitiesMember		 $ 1,420pei_RealEstateCapitalizedCost
/ us-gaap_NatureOfExpenseAxis
= pei_SalariesAndBenefitsExpenseMember
/ us-gaap_RealEstatePropertiesAxis
= pei_LeasingActivitiesMember