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Related Party Transactions (Narrative) (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Property
Dec. 31, 2013
Dec. 31, 2012
Related Party Transactions [Abstract]      
Properties owned 7pei_NumberOfOfficePropertiesOwned    
Revenue earned $ 0.6pei_RelatedPartyManagementLeasingAndDevelopmentRevenue $ 1.0pei_RelatedPartyManagementLeasingAndDevelopmentRevenue $ 1.0pei_RelatedPartyManagementLeasingAndDevelopmentRevenue
Landlord interest 50.00%pei_InterestOfRelatedPartyInThirdParty    
Total rent expense $ 1.2us-gaap_LeaseAndRentalExpense $ 1.4us-gaap_LeaseAndRentalExpense $ 1.5us-gaap_LeaseAndRentalExpense