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Joint Ventures (Details Textual) (USD $)
 3 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 1 Months Ended 3 Months Ended 9 Months Ended 9 Months Ended
Sep. 30, 2014
Communities
Sep. 30, 2013
Sep. 30, 2014
Communities
Sep. 30, 2013
Dec. 31, 2013
Dec. 31, 2012
Jan. 31, 2014
Sep. 30, 2014
Unconsolidated Joint Venture Two Stoughton Massachusetts [Member]
Dec. 31, 2013
Unconsolidated Joint Venture Two Stoughton Massachusetts [Member]
Sep. 30, 2014
Unconsolidated Joint Venture Five San Diego California [Member]
Dec. 31, 2013
Unconsolidated Joint Venture Five San Diego California [Member]
Jan. 31, 2014
13th & Market [Member]
Dec. 31, 2013
Unconsolidated Joint Venture 399 Fremont [Member]
Jul. 31, 2014
MetLife Swap [Member]
Sep. 30, 2014
MetLife Swap [Member]
Sep. 30, 2014
MetLife Swap [Member]
Dec. 31, 2013
MetLife Swap [Member]
Sep. 30, 2014
Land [Member]
Unconsolidated Joint Venture Vitruvian Park [Member]
Sep. 30, 2014
Land [Member]
Unconsolidated Joint Venture UDR Met Life I Partnership [Member]
Land_Parcels
Dec. 31, 2013
Land [Member]
Unconsolidated Joint Venture UDR Met Life I Partnership [Member]
Sep. 30, 2014
Land [Member]
Unconsolidated Joint Venture UDR MetLife II Partnership [Member]
Land_Parcels
Sep. 30, 2014
Land [Member]
Noncontrolling Interest [Member]
Sep. 30, 2014
Land [Member]
Unconsolidated Joint Venture Other MetLife [Member]
Communities
Sep. 30, 2014
Operating Community [Member]
Sep. 30, 2014
Operating Community [Member]
Unconsolidated Joint Venture Vitruvian Park [Member]
Dec. 31, 2013
Operating Community [Member]
Unconsolidated Joint Venture Vitruvian Park [Member]
Sep. 30, 2014
Operating Community [Member]
Unconsolidated Joint Venture UDR Met Life I Partnership [Member]
Communities
Mar. 31, 2014
Operating Community [Member]
Unconsolidated Joint Venture UDR Met Life I Partnership [Member]
Communities
Dec. 31, 2013
Operating Community [Member]
Unconsolidated Joint Venture UDR Met Life I Partnership [Member]
Sep. 30, 2014
Operating Community [Member]
Unconsolidated Joint Venture UDR MetLife II Partnership [Member]
Communities
Dec. 31, 2013
Operating Community [Member]
Unconsolidated Joint Venture UDR MetLife II Partnership [Member]
Sep. 30, 2014
Operating Community [Member]
Unconsolidated Joint Venture Three Washington DC [Member]
Communities
Dec. 31, 2013
Operating Community [Member]
Unconsolidated Joint Venture Three Washington DC [Member]
Sep. 30, 2014
Operating Community [Member]
Unconsolidated Joint Venture Four Texas [Member]
Communities
Dec. 31, 2013
Operating Community [Member]
Unconsolidated Joint Venture Four Texas [Member]
Sep. 30, 2014
Development Community [Member]
Unconsolidated Joint Venture Vitruvian Park [Member]
Communities
Sep. 30, 2014
Development Community [Member]
Unconsolidated Joint Venture Other MetLife [Member]
Communities
Dec. 31, 2013
Development Community [Member]
Unconsolidated Joint Venture Other MetLife [Member]
Schedule of Equity Method Investments [Line Items]                                                                            
Number of apartments of development community                         0                                                  
Communities Sold     6 0 2                     2               1                            
Proceeds from Sale of Property, Plant, and Equipment     $ 237,700,000                         $ 3,000,000                                            
Joint Venture and Partnership Number of Operating Communities Owned 141   141                             6 5   2   1,000       0 6   21   3   8   1 2,000  
Number of extension options on loan               2                                                            
Extension period of option on loan               3 months                                                            
Secured Debt 1,399,372,000   1,399,372,000   1,442,077,000                                                                  
Joint Ventures                                                                            
Ownership interest in joint venture                   0.00% 5.00%                                                      
Ownership percentage, equity method investment                 95.00%           50.00% 50.00% 12.00%   4.00% 4.00% 50.10% 49.90% 4.00%   50.00% 50.00% 0.00%   13.20% 50.00% 50.00% 30.00% 30.00% 20.00% 20.00%   51.00% 51.00%
Real Estate Owned Gross 8,428,291,000   8,428,291,000   8,207,977,000                                                                  
Unamortized discount 8,000,000   8,000,000   11,800,000                                                                  
First installment of payable incurred in partial consideration for acquisition of ownership interest in joint venture 37,835,000   37,835,000                                                                      
Second installment of payable incurred in partial consideration for acquisition of ownership interest in joint venture 521,233,000   521,233,000                                                                      
Interest expense (33,087,000) (30,939,000) (97,662,000) (92,723,000)   (92,723,000)                                                                
Company's equity investment in joint venture 650,441,000   650,441,000   507,655,000                           5,364,000 7,161,000         79,807,000 79,318,000 0   40,336,000 436,805,000 327,926,000 22,891,000 25,919,000 (25,624,000) (23,591,000)   87,376,000 36,313,000
Non-controlling interest held in joint venture                   95.00%                                                        
Deferred profit from the sale of properties 27,132,000   27,132,000   25,400,000                                                                  
Management fees for our involvement in the joint ventures 2,700,000 2,800,000 8,300,000 8,500,000                                                                    
Cash Paid in Equity Method Investment Exchange                           21,500,000 82,500,000                                              
Property, Plant and Equipment, Additions     129,400,000                                                                      
Debt associated with Real estate acquired 63,600,000   63,600,000                                                                      
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High             $ 4,000,000         $ 2,000,000