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Joint Ventures (Details Textual) (USD $)
 3 Months Ended 6 Months Ended 12 Months Ended 3 Months Ended 6 Months Ended 0 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 0 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Dec. 31, 2007
Communities
Apartment_Homes
Jun. 30, 2012
Unconsolidated Joint Venture One/UDR MetLife Partnership [Member]
Communities
Apartment_Homes
Land_Parcels
Jun. 30, 2011
Unconsolidated Joint Venture One/UDR MetLife Partnership [Member]
Jun. 30, 2012
Unconsolidated Joint Venture One/UDR MetLife Partnership [Member]
Communities
Apartment_Homes
Land_Parcels
Jun. 30, 2011
Unconsolidated Joint Venture One/UDR MetLife Partnership [Member]
Jan. 12, 2012
Unconsolidated Joint Venture One/UDR MetLife Partnership [Member]
Dec. 31, 2011
Unconsolidated Joint Venture One/UDR MetLife Partnership [Member]
Dec. 31, 2010
Unconsolidated Joint Venture One/UDR MetLife Partnership [Member]
Jan. 12, 2012
Columbus Square [Member]
Apartment_Homes
Communities
Jan. 12, 2012
Unconsolidated Joint Venture Seven UDR MetLife II Partnership [Member]
Communities
Jun. 30, 2012
Unconsolidated Joint Venture Seven UDR MetLife II Partnership [Member]
Jun. 30, 2012
Unconsolidated Joint Venture Eight San Francisco California [Member]
Jan. 09, 2012
Unconsolidated Joint Venture Eight San Francisco California [Member]
Jun. 30, 2012
Unconsolidated Joint Venture Nine Boston Massachusetts [Member]
May 31, 2012
Unconsolidated Joint Venture Nine Boston Massachusetts [Member]
Jun. 30, 2012
Unconsolidated Joint Venture Two Stoughton Massachusetts [Member]
Dec. 31, 2011
Unconsolidated Joint Venture Two Stoughton Massachusetts [Member]
Oct. 31, 2010
Unconsolidated Joint Venture Two Stoughton Massachusetts [Member]
Jun. 30, 2012
Unconsolidated Joint Venture Three Washington DC [Member]
Dec. 31, 2011
Unconsolidated Joint Venture Three Washington DC [Member]
Jun. 30, 2012
Unconsolidated Joint Venture Four Texas [Member]
Dec. 31, 2011
Unconsolidated Joint Venture Four Texas [Member]
Jun. 30, 2012
Unconsolidated Joint Venture Five San Diego California [Member]
Dec. 31, 2011
Unconsolidated Joint Venture Five San Diego California [Member]
May 31, 2011
Unconsolidated Joint Venture Five San Diego California [Member]
Jun. 30, 2012
Unconsolidated Joint Venture Six College Park Maryland [Member]
Dec. 31, 2011
Unconsolidated Joint Venture Six College Park Maryland [Member]
Jun. 30, 2011
Unconsolidated Joint Venture Six College Park Maryland [Member]
Jun. 30, 2012
Consolidated Joint Venture One Orange County California [Member]
Dec. 31, 2011
Consolidated Joint Venture One Orange County California [Member]
Jun. 30, 2012
Land [Member]
Unconsolidated Joint Venture One/UDR MetLife Partnership [Member]
Dec. 31, 2010
Land [Member]
Unconsolidated Joint Venture One/UDR MetLife Partnership [Member]
Jun. 30, 2012
Buildings [Member]
Unconsolidated Joint Venture One/UDR MetLife Partnership [Member]
Dec. 31, 2010
Buildings [Member]
Unconsolidated Joint Venture One/UDR MetLife Partnership [Member]
Jun. 30, 2012
Intangible Assets [Member]
Unconsolidated Joint Venture One/UDR MetLife Partnership [Member]
Dec. 31, 2010
Intangible Assets [Member]
Unconsolidated Joint Venture One/UDR MetLife Partnership [Member]
Apr. 27, 2012
Corporate Joint Venture [Member]
Unconsolidated Joint Venture Four Texas [Member]
Communities
Apartment_Homes
Joint Ventures                                                                                    
Total ownership of our consolidated joint ventures less than 100%   less than 100%                                                                              
Joint venture, number of homes in communities             3,930   3,930         2,528                 240 660           263     256   173             633
Contribution made by company                                                                     $ 9,000,000              
Controlling interest in consolidated joint venture                                                                   90.00%                
Maximum number of days within which criteria is to met         730 days                                                                          
Additional contribution made by company         3,000,000                                                                          
Contingent consideration accrued in business combination         3,000,000                                                                          
Fair value of underlying property         9,800,000                                                                          
Fair value of underlying property upon completion of the entitlement process         12,800,000                                                                          
Initial investment in equity method investment                         100,800,000   327,100,000     37,300,000   26,000,000     10,000,000     20,400,000       9,900,000     7,100,000                  
Number of operating communities in joint venture             19   19   7     12                   3                                   2
Number of land parcels owned             10   10                                                                  
Interest Held in Joint Venture                           50.00%                                                        
Real Estate Investments                           1,300,000,000                                                        
Joint Venture Number of Operating Communities Transferred From Existing Ventures                             7                                                      
Number of additional apartment homes             2,000   2,000                                                                  
Equity method investment, ownership percent             12.60%   12.60%                             30.00%                       4.00%           80.00%
Cash paid in partial consideration for acquisition of ownership interest in joint venture                         71,800,000                                                          
Payable incurred in partial consideration for acquisition of ownership interest in joint venture                         30,000,000                                                          
Unamortized discount 19,500,000   19,500,000   24,100,000               1,000,000                                                          
First installment of payable incurred in partial consideration for acquisition of ownership interest in joint venture                         20,000,000                                                          
Second installment of payable incurred in partial consideration for acquisition of ownership interest in joint venture                         10,000,000                                                          
Net carrying amount of payable incurred in partial consideration for acquisition of ownership interest in joint venture             9,900,000   9,900,000     9,800,000 29,000,000                                                          
Effective interest rate of payable                         2.67%                                                          
Interest expense incurred during period             66,000 196,000 132,000 391,000                                                                
Company's equity investment in joint venture 580,098,000   580,098,000   213,040,000   100,200,000   100,200,000     133,800,000       323,700,000 38,900,000   27,100,000   16,700,000 17,200,000   32,100,000 34,100,000 4,600,000 7,100,000 22,500,000 12,100,000   14,400,000 8,600,000                    
UDR's proportionate share in the underlying net assets of the joint venture                         111,400,000                                                          
Difference between total cost of the Company's equity investment and proportionate share in the underlying assets of the joint venture                         10,600,000                                               3,900,000   8,400,000   (1,600,000)  
Amortization/Accretion of the Company's carrying value of its equity method investment 42,000 395,000 88,000 791,000                                                                            
Amortization period attributable to adjustment to UDR's proportionate share in partnership's assets                                                                           45 years   11 months    
Joint Venture Number of Operating Communities, New Properties                             5                                                      
Real Estate Investments, Joint Ventures                             637,500,000                                                      
Payments to Acquire Equity Method Investments     297,127,000 33,245,000                     293,500,000                                                      
Equity transferred value, equity method investment                             33,600,000                                                      
Payments for (Proceeds from) Deposits on Real Estate Acquisitions     0 44,176,000                     80,400,000                                                      
Anticipated Period to refinance loans by partnership             12 months                                                                      
Non-controlling interest held in joint venture                                 92.50%   98.00%   95.00% 95.00%   30.00% 30.00%     95.00% 95.00%   95.00% 95.00%                    
Joint venture investment in multifamily properties                                               450,000,000                                    
Joint Venture, Number of Apartment Homes in Operating Communities acquired                           5                                                        
Total equity contribution by partners when fully invested                                               180,000,000                                    
UDR's equity investment in joint venture when fully invested                                               54,000,000                                    
Company's contribution in cash equal to fair value of the properties                                                   80.00%                                
Contribution in cash and property equal to fair value of properties                                                   20.00%                                
Number of properties initially contributed to joint venture           10                                                                        
Number of apartment homes initially contributed           3,992                                                                        
Number of properties purchased from UDR                                                   9                                
Payments to Acquire Businesses and Interest in Affiliates                                                                                   11,700,000
Deferred profit from the sale of properties 29,430,000   29,430,000   29,100,000                                                                          
Management fees for our involvement in the joint ventures $ 2,700,000 $ 2,500,000 $ 5,700,000 $ 3,800,000