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Financing Activity - Mortgage Loan Activity Additional Detail (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Apr. 30, 2015
Francis Scott Key Mall [Member]    
Mortgage Loan Activity [Line Items]    
Repayment Of Mortgage Secured Loan $ 5.8pei_RepaymentOfMortgageSecuredLoan
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= pei_FrancisScottKeyMallMember		  
Magnolia Mall [Member]    
Mortgage Loan Activity [Line Items]    
Repayment Of Mortgage Secured Loan 55.6pei_RepaymentOfMortgageSecuredLoan
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= pei_MagnoliaMallMember		  
Magnolia Mall [Member] | Subsequent Event [Member] | Revolving Credit Facility [Member]    
Mortgage Loan Activity [Line Items]    
Revolving Facility Debt Used to Repay Mortgage Debt   40.0pei_RevolvingFacilityDebtUsedToRepayMortgageDebt
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= pei_MagnoliaMallMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Available Cash From Working Capital Used To Repay Mortgage Debt   $ 15.6pei_AvailableCashFromWorkingCapitalUsedToRepayMortgageDebt
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= pei_MagnoliaMallMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember