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Document and Entity Information
 6 Months Ended
Jun. 30, 2012
Jul. 30, 2012
Entity Registrant Name UDR, Inc.  
Entity Central Index Key 0000074208  
Document Type 10-Q  
Document Period End Date Jun. 30, 2012  
Amendment Flag false  
Document Fiscal Year Focus 2012  
Document Fiscal Period Focus Q2  
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   250,205,421
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 Jun. 30, 2012  
Amendment Flag false  
Document Fiscal Year Focus 2012  
Document Fiscal Period Focus Q2  
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