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Real Estate Activities (Narrative) (Detail) (USD $)
 3 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Apr. 30, 2013
Dec. 31, 2011
Sep. 30, 2013
Jul. 31, 2014
Real Estate Properties [Line Items]                              
Impairment of long lived asset to their estimated fair value                 $ 19,695,000pei_ImpairmentOfAssets $ 29,966,000pei_ImpairmentOfAssets $ 3,805,000pei_ImpairmentOfAssets        
Gain or loss on sale of real estate 13,100,000pei_GainLossOnSaleOfRealEstate               1,774,000pei_GainLossOnSaleOfRealEstate            
Income recognized from grant 18,458,000us-gaap_NetIncomeLoss [1],[2] (859,000)us-gaap_NetIncomeLoss [1] (23,325,000)us-gaap_NetIncomeLoss [1] (8,104,000)us-gaap_NetIncomeLoss [1] 7,550,000us-gaap_NetIncomeLoss [1],[2] 12,202,000us-gaap_NetIncomeLoss [1] (8,695,000)us-gaap_NetIncomeLoss [1] 24,802,000us-gaap_NetIncomeLoss [1] (13,830,000)us-gaap_NetIncomeLoss [1] 35,859,000us-gaap_NetIncomeLoss [1] (40,837,000)us-gaap_NetIncomeLoss        
Land purchase contracts                 100,000pei_RefundableDepositOnLandPurchaseContract            
Repayments of Secured Debt                 76,784,000us-gaap_RepaymentsOfSecuredDebt 403,691,000us-gaap_RepaymentsOfSecuredDebt 320,731,000us-gaap_RepaymentsOfSecuredDebt        
Northeast Tower Center [Member]                              
Real Estate Properties [Line Items]                              
Sale of controlling interest in Northeast Tower Center                 3,800,000pei_SaleOfSubsidiary
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= pei_NortheastIndustrialCenterMember		            
Gain or loss on sale of real estate                 900,000pei_GainLossOnSaleOfRealEstate
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= pei_NortheastIndustrialCenterMember		            
Nittany Mall [Member]                              
Real Estate Properties [Line Items]                              
Impairment of long lived asset to their estimated fair value                 15,495,000pei_ImpairmentOfAssets
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= pei_NittanyMallMember		            
Capitalization Rate                 16.20%pei_CapitalizationRates
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= pei_NittanyMallMember		            
The Gallery at Market East [Member]                              
Real Estate Properties [Line Items]                              
Payments to acquire buildings                       59,600,000us-gaap_PaymentsToAcquireBuildings
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= pei_GalleryAtMarketEastMember		      
Capitalization Rate                       5.70%pei_CapitalizationRates
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= pei_GalleryAtMarketEastMember		      
Chambersburg Mall [Member]                              
Real Estate Properties [Line Items]                              
Impairment of long lived asset to their estimated fair value                   23,662,000pei_ImpairmentOfAssets
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= pei_ChambersburgMallMember		          
Phillipsburg Mall [Member]                              
Real Estate Properties [Line Items]                              
Impairment of long lived asset to their estimated fair value                     3,805,000pei_ImpairmentOfAssets
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= pei_PhillipsburgMallMember		   28,000,000pei_ImpairmentOfAssets
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= pei_PhillipsburgMallMember		    
North Hanover Mall [Member]                              
Real Estate Properties [Line Items]                              
Impairment of long lived asset to their estimated fair value                 2,900,000pei_ImpairmentOfAssets
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= pei_NorthHanoverMallMember		 6,304,000pei_ImpairmentOfAssets
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= pei_NorthHanoverMallMember		     24,100,000pei_ImpairmentOfAssets
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= pei_NorthHanoverMallMember		    
Capitalization Rate                 11.00%pei_CapitalizationRates
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= pei_NorthHanoverMallMember		            
Voorhees Town Center [Member]                              
Real Estate Properties [Line Items]                              
Proceeds from sale of building                           10,500,000us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= pei_VoorheesTownCenterMember		  
Gain (Loss) on sale of building                           0us-gaap_GainLossOnSaleOfPropertyPlantEquipment
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= pei_VoorheesTownCenterMember		  
The Gallery at Market East [Member]                              
Real Estate Properties [Line Items]                              
Real Estate Property Sales Price                             106,800,000pei_RealEstatePropertySalesPrice
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= pei_TheGalleryatMarketEastMember
Proceeds from Sale of Real Estate   104,000,000us-gaap_ProceedsFromSaleOfRealEstate
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= pei_TheGalleryatMarketEastMember		                          
Repayments of Secured Debt                             25,800,000us-gaap_RepaymentsOfSecuredDebt
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= pei_TheGalleryatMarketEastMember
Repayments of Unsecured Debt   50,000,000us-gaap_RepaymentsOfUnsecuredDebt
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= pei_TheGalleryatMarketEastMember		                          
Parcel And Land Improvements [Member]                              
Real Estate Properties [Line Items]                              
Sale Price                   9,900,000pei_RealEstatePropertySalePrice
/ us-gaap_RealEstatePropertiesAxis
= pei_ParcelAndLandImprovementsMember		          
Gain/ (Loss)                 1,800,000pei_GainLossOnDispositionOfRealEstate
/ us-gaap_RealEstatePropertiesAxis
= pei_ParcelAndLandImprovementsMember		            
Land, Buildings and Improvements [Member]                              
Real Estate Properties [Line Items]                              
Gain/ (Loss)                 $ 700,000pei_GainLossOnDispositionOfRealEstate
/ us-gaap_RealEstatePropertiesAxis
= us-gaap_LandBuildingsAndImprovementsMember		            
[1] Includes gains on sales of discontinued operations (before non controlling interest) of $33.4 million (1st Quarter 2013), $45.1 million (3rd Quarter 2013).
[2] Fourth Quarter revenue includes a significant portion of annual percentage rent as most percentage rent minimum sales levels are met in the fourth quarter.