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Significant Transactions - Acquisitions of Apartment Communities (Details 1) (Series of Individually Immaterial Business Acquisitions [Member])
Dec. 31, 2014
acre
Series of Individually Immaterial Business Acquisitions [Member]
  
Business Acquisition [Line Items]  
Area of Land Acquired 2.4us-gaap_AreaOfRealEstateProperty
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember