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Joint Ventures (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Financial information relating to unconsolidated joint ventures operations          
UDR recorded loss from unconsolidated entities $ (2,412) $ (1,348) $ (5,103) $ (2,680)  
Combined summary of balance sheets relating to unconsolidated joint ventures          
Investment in unconsolidated joint ventures 580,098   580,098   213,040
Unconsolidated Joint Venture One U D R Met Life Partnership [Member]
          
Combined summary of balance sheets relating to unconsolidated joint ventures          
Investment in unconsolidated joint ventures 100,200   100,200   133,800
Unconsolidated Joint Ventures [Member]
          
Financial information relating to unconsolidated joint ventures operations          
Revenues 74,725 48,414 137,750 95,005  
Real estate depreciation and amortization 26,489 16,737 52,374 33,338  
Net loss 3,544 (3,142) (5,077) (8,731)  
UDR recorded loss from unconsolidated entities 2,412 1,348 5,103 2,680  
Combined summary of balance sheets relating to unconsolidated joint ventures          
Real estate, net 3,550,889   3,550,889   2,908,623
Total assets 3,655,128   3,655,128   2,998,866
Amount due to UDR 12,853   12,853   6,251
Third party debt 1,770,990   1,770,990   1,499,419
Total liabilities 1,823,697   1,823,697   1,561,396
Total equity 1,816,754   1,816,754   1,437,470
Equity held by non-controlling interest $ 14,677   $ 14,677   $ 14,641