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Cash Flow Information - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Other Significant Noncash Transactions [Line Items]    
Cash paid for interest $ 17.0us-gaap_InterestPaid $ 17.0us-gaap_InterestPaid
Net of capitalized interest 0.1us-gaap_InterestPaidCapitalized 0.1us-gaap_InterestPaidCapitalized
Line of credit facilities gross borrowings 210.0pei_Lineofcreditfacilitiesgrossborrowings 90.0pei_Lineofcreditfacilitiesgrossborrowings
Line of credit facilities gross repayments   195.0pei_Lineofcreditfacilitiesgrossrepayments
Springfield Town Center [Member]    
Other Significant Noncash Transactions [Line Items]    
Other significant noncash transaction, consideration given, OP Units 6,250,000pei_OthersignificantnoncashtransactionconsiderationgivenOPUnits
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= pei_SpringfieldTownCenterMember		  
Other Significant Noncash Transaction, Value of Consideration Given $ 145.2us-gaap_OtherSignificantNoncashTransactionValueOfConsiderationGiven1
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= pei_SpringfieldTownCenterMember