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Document and Entity Information
 9 Months Ended
Sep. 30, 2014
Oct. 27, 2014
Entity Registrant Name UDR, Inc.  
Entity Central Index Key 0000074208  
Document Type 10-Q  
Document Period End Date Sep. 30, 2014  
Amendment Flag false  
Document Fiscal Year Focus 2014  
Document Fiscal Period Focus Q3  
Current Fiscal Year End Date --12-31  
Entity Well-known Seasoned Issuer Yes  
Entity Voluntary Filers No  
Entity Current Reporting Status Yes  
Entity Filer Category Large Accelerated Filer  
Entity Common Stock, Shares Outstanding   255,217,903
United Dominion Reality L.P. [Member]
    
Entity Registrant Name United Dominion Realty L.P.  
Entity Central Index Key 0001018254  
Document Type 10-Q  
Document Period End Date Sep. 30, 2014  
Amendment Flag false  
Document Fiscal Year Focus 2014  
Document Fiscal Period Focus Q3  
Current Fiscal Year End Date --12-31  
Entity Well-known Seasoned Issuer No  
Entity Voluntary Filers No  
Entity Current Reporting Status Yes  
Entity Filer Category Non-accelerated Filer  
Entity Common Stock, Shares Outstanding   0