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Real Estate Owned (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Property, Plant and Equipment [Line Items]        
Document Period End Date Dec. 31, 2014      
Summary of carrying amounts for real estate owned (at cost)        
Land and Land Improvements $ 1,980,221us-gaap_LandAndLandImprovements $ 1,847,127us-gaap_LandAndLandImprovements    
Investment Building and Building Improvements, and Furniture, Fixtures and Equipment 6,225,406udr_InvestmentBuildingandBuildingImprovementsandFurnitureFixturesandEquipment 5,876,717udr_InvestmentBuildingandBuildingImprovementsandFurnitureFixturesandEquipment    
Under development:        
Real estate under development (net of accumulated depreciation of $0 and $1,411, respectively) 177,632us-gaap_DevelopmentInProcess 466,002us-gaap_DevelopmentInProcess    
Sold or held for sale:        
Real estate owned 8,383,259udr_RealEstateOwnedGross 8,207,977udr_RealEstateOwnedGross    
Accumulated depreciation (2,434,772)us-gaap_RealEstateAccumulatedDepreciation (2,208,794)us-gaap_RealEstateAccumulatedDepreciation (1,924,682)us-gaap_RealEstateAccumulatedDepreciation (1,831,727)us-gaap_RealEstateAccumulatedDepreciation
Total real estate owned, net of accumulated depreciation 5,948,487udr_RealEstateNet 5,999,183udr_RealEstateNet    
Land        
Under development:        
Real estate under development (net of accumulated depreciation of $0 and $1,411, respectively) 24,584us-gaap_DevelopmentInProcess
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandMember
110,769us-gaap_DevelopmentInProcess
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandMember
   
Sold or held for sale:        
Sold or held for sale 0us-gaap_RealEstateHeldforsale
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandMember
10,751us-gaap_RealEstateHeldforsale
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandMember
   
Construction in progress        
Under development:        
Real estate under development (net of accumulated depreciation of $0 and $1,411, respectively) 153,048us-gaap_DevelopmentInProcess
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ConstructionInProgressMember
356,644us-gaap_DevelopmentInProcess
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ConstructionInProgressMember
   
Building and improvements        
Sold or held for sale:        
Sold or held for sale $ 0us-gaap_RealEstateHeldforsale
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingAndBuildingImprovementsMember
$ 5,969us-gaap_RealEstateHeldforsale
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingAndBuildingImprovementsMember