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Consolidated Balance Sheets (UNITED DOMINION REALTY, L.P) (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Real estate under development, accumulated depreciation $ 0udr_RealEstateUnderDevelopmentAccumulatedDepreciation $ 1,411udr_RealEstateUnderDevelopmentAccumulatedDepreciation
Real estate owned:    
Real estate held for sale, accumulated depreciation 0udr_AccumulatedDepreciationOfAssetsOfDisposalGroupIncludingDiscontinuedOperations 6,568udr_AccumulatedDepreciationOfAssetsOfDisposalGroupIncludingDiscontinuedOperations
Partners' Capital:    
OP units outstanding related to limited partner 183,278,698us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding 183,278,698us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding
United Dominion Reality L.P.    
Real estate under development, accumulated depreciation 0udr_RealEstateUnderDevelopmentAccumulatedDepreciation
/ dei_LegalEntityAxis
= udr_UnitedDominionRealityLPMember		 0udr_RealEstateUnderDevelopmentAccumulatedDepreciation
/ dei_LegalEntityAxis
= udr_UnitedDominionRealityLPMember
Real estate owned:    
Real estate held for sale, accumulated depreciation $ 0udr_AccumulatedDepreciationOfAssetsOfDisposalGroupIncludingDiscontinuedOperations
/ dei_LegalEntityAxis
= udr_UnitedDominionRealityLPMember		 $ 0udr_AccumulatedDepreciationOfAssetsOfDisposalGroupIncludingDiscontinuedOperations
/ dei_LegalEntityAxis
= udr_UnitedDominionRealityLPMember
Partners' Capital:    
OP units outstanding related to operating partnership 183,278,698us-gaap_UnitsOfPartnershipInterestAmount
/ dei_LegalEntityAxis
= udr_UnitedDominionRealityLPMember		 183,278,698us-gaap_UnitsOfPartnershipInterestAmount
/ dei_LegalEntityAxis
= udr_UnitedDominionRealityLPMember
OP units outstanding related to general partner 110,883us-gaap_GeneralPartnersCapitalAccountUnitsOutstanding
/ dei_LegalEntityAxis
= udr_UnitedDominionRealityLPMember		 110,883us-gaap_GeneralPartnersCapitalAccountUnitsOutstanding
/ dei_LegalEntityAxis
= udr_UnitedDominionRealityLPMember
OP units outstanding related to limited partner 183,167,815us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding
/ dei_LegalEntityAxis
= udr_UnitedDominionRealityLPMember		 183,167,815us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding
/ dei_LegalEntityAxis
= udr_UnitedDominionRealityLPMember