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Noncontrolling Interests (Details) (USD $)
 3 Months Ended 12 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
Noncontrolling Interest [Line Items]                      
Net (loss)/income attributable to common stockholders $ 64,486,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 39,618,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 29,076,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 17,430,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 35,769,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 2,257,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 4,261,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ (1,199,000)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 150,610,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 41,088,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 203,376,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Acquisition of non-controlling interest                     (4,871,000)us-gaap_MinorityInterestDecreaseFromRedemptions
Number of Apartment Homes Acquired   358udr_NumberOfApartmentHomesAcquired                  
Change in equity from net loss income attributable to common stockholders and conversion of operating partnership units to companys common stock                 154,982,000udr_ChangeInEquityFromNetLossIncomeAttributableToCommonStockholdersAndConversionOfOperatingPartnershipUnitsToCompanysCommonStock 42,905,000udr_ChangeInEquityFromNetLossIncomeAttributableToCommonStockholdersAndConversionOfOperatingPartnershipUnitsToCompanysCommonStock 203,905,000udr_ChangeInEquityFromNetLossIncomeAttributableToCommonStockholdersAndConversionOfOperatingPartnershipUnitsToCompanysCommonStock
Number of Communities Acquired   2udr_NumberofCommunitiesAcquired                  
Redeemable noncontrolling interests in the Operating Partnership                      
Beginning redeemable non-controlling interests in the Operating Partnership       217,597,000us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount       223,418,000us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount 217,597,000us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount 223,418,000us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount  
Mark to market adjustment to redeemable non-controlling interests in the Operating Partnership                 73,954,000us-gaap_MinorityInterestChangeInRedemptionValue 3,656,000us-gaap_MinorityInterestChangeInRedemptionValue (11,392,000)us-gaap_MinorityInterestChangeInRedemptionValue
Adjustment for conversion of non-controlling interest of unitholders in Operating Partnership                 (4,372,000)us-gaap_StockIssuedDuringPeriodValueConversionOfUnits (1,817,000)us-gaap_StockIssuedDuringPeriodValueConversionOfUnits (529,000)us-gaap_StockIssuedDuringPeriodValueConversionOfUnits
Net income attributable to redeemable non-controlling interests in the Operating Partnership                 5,511,000us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest 1,530,000us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest 7,986,000us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest
Distributions to redeemable non-controlling interests in the Operating Partnership                 (10,077,000)udr_DistributionsToRedeemableNoncontrollingInterestsInOperatingPartnership (9,440,000)udr_DistributionsToRedeemableNoncontrollingInterestsInOperatingPartnership  
Ending redeemable non-controlling interests in the Operating Partnership         217,597,000us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount         217,597,000us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount 223,418,000us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount
Net income/(loss) attributable to non-controlling interests                 (3,000)us-gaap_NetIncomeLossAttributableToNonredeemableNoncontrollingInterest (60,000)us-gaap_NetIncomeLossAttributableToNonredeemableNoncontrollingInterest 140,000us-gaap_NetIncomeLossAttributableToNonredeemableNoncontrollingInterest
Noncontrolling Interest                      
Noncontrolling Interest [Line Items]                      
Acquisition of non-controlling interest                   (4,900,000)us-gaap_MinorityInterestDecreaseFromRedemptions
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember		 (4,871,000)us-gaap_MinorityInterestDecreaseFromRedemptions
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
Redeemable noncontrolling interests in the Operating Partnership                      
Net income/(loss) attributable to non-controlling interests                 (3,000)us-gaap_NetIncomeLossAttributableToNonredeemableNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember		 (60,000)us-gaap_NetIncomeLossAttributableToNonredeemableNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember		 140,000us-gaap_NetIncomeLossAttributableToNonredeemableNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
Operating Community [Member] | Noncontrolling Interest                      
Noncontrolling Interest [Line Items]                      
Acquisition of non-controlling interest                   (4,000,000)us-gaap_MinorityInterestDecreaseFromRedemptions
/ udr_ConsolidatedJointVentureAxis
= udr_OperatingCommunityMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember		  
Number of Apartment Homes Acquired                   434udr_NumberOfApartmentHomesAcquired
/ udr_ConsolidatedJointVentureAxis
= udr_OperatingCommunityMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember		  
Development Community [Member] | Noncontrolling Interest                      
Noncontrolling Interest [Line Items]                      
Acquisition of non-controlling interest                   (900,000)us-gaap_MinorityInterestDecreaseFromRedemptions
/ udr_ConsolidatedJointVentureAxis
= udr_DevelopmentCommunityMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember		  
RedeemableNoncontrollingInterest [Member]                      
Redeemable noncontrolling interests in the Operating Partnership                      
Other Comprehensive (Income) Loss, Net of Tax, Portion Attributable to Noncontrolling Interest                 $ (133,000)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest
/ udr_NoncontrollinginteresttypeAxis
= udr_RedeemablenoncontrollinginterestMember		 $ 250,000us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest
/ udr_NoncontrollinginteresttypeAxis
= udr_RedeemablenoncontrollinginterestMember		 $ 80,000us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest
/ udr_NoncontrollinginteresttypeAxis
= udr_RedeemablenoncontrollinginterestMember
Corporate Joint Venture [Member]                      
Noncontrolling Interest [Line Items]                      
Number of Communities Acquired                   2udr_NumberofCommunitiesAcquired
/ us-gaap_InvestmentTypeAxis
= us-gaap_CorporateJointVentureMember		  
Operating Community [Member]                      
Noncontrolling Interest [Line Items]                      
Number of Communities Acquired                   1udr_NumberofCommunitiesAcquired
/ us-gaap_InvestmentTypeAxis
= udr_OperatingCommunityMember