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Unconsolidated Entities (UNITED DOMINION REALTY, L.P.) Unconsolidated Entities (UNITED DOMINION REALTY, L.P.) (Details 1) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Schedule of Equity Method Investments [Line Items]      
Equity Method Investment, Summarized Financial Information, Revenue $ 219,714 $ 193,453 $ 142,842
Equity Method Investment Summarized Financial Information Property Operating Expense (87,500) 72,099 49,390
Equity Method Investment Summarized Financial Information Depreciation Amortization (75,492) 69,399 51,830
Equity Method of Investment Summarized Financial Information Operating income/(loss) 56,722 51,955 41,622
Equity Method Investment Summarized Financial Information Interest expense (64,990) (58,591) (45,726)
Equity Method Investment Summarized Financial Information Other income/(expense)     1
Equity Method Investment, Summarized Financial Information, Net Income (Loss) 175,850 (42,667) (36,075)
Income/(loss) from unconsolidated entities 62,329 (7,006) (415)
Equity Method Investment Summarized Financial Information Real Estate, Net 3,135,757 2,941,803  
Equity Method Investment Summarized Financial Information Cash and cash equivalents 36,480 32,544  
Equity Method Investment Summarized Financial Information Other assets 29,891 17,849  
Equity Method Investment Summarized Financial Information Amount Due to Related Party 7,266 2,997  
Equity Method Investment, Summarized Financial Information, Assets 3,202,128 3,208,392  
Equity Method Investment Summarized Financial Information Accounts payable and accrued liabilities 95,523 44,335  
Equity Method Investment, Summarized Financial Information, Liabilities 1,717,252 1,770,657  
Equity Method Investment Summarized Financial Information, Equity 1,484,876 1,437,735  
Investment in unconsolidated entities 938,906 718,226  
UDR Lighthouse DownREIT L.P. [Member]      
Schedule of Equity Method Investments [Line Items]      
Equity Method Investment, Summarized Financial Information, Net Income (Loss) (15,804)    
United Dominion Reality L.P.      
Schedule of Equity Method Investments [Line Items]      
Income/(loss) from unconsolidated entities (4,659) 0 $ 0
Investment in unconsolidated entities 166,186 0  
United Dominion Reality L.P. | UDR Lighthouse DownREIT L.P. [Member]      
Schedule of Equity Method Investments [Line Items]      
Equity Method Investment, Summarized Financial Information, Revenue 29,933    
Equity Method Investment Summarized Financial Information Property Operating Expense (9,991)    
Equity Method Investment Summarized Financial Information Depreciation Amortization (28,934)    
Equity Method of Investment Summarized Financial Information Operating income/(loss) (8,992)    
Equity Method Investment Summarized Financial Information Interest expense (3,632)    
Equity Method Investment Summarized Financial Information Other income/(expense) (3,180)    
Equity Method Investment Summarized Financial Information Real Estate, Net 1,457,244    
Equity Method Investment Summarized Financial Information Cash and cash equivalents 89    
Equity Method Investment Summarized Financial Information Other assets 37,228    
Equity Method Investment Summarized Financial Information, Notes Receivable 126,500    
Equity Method Investment Summarized Financial Information Amount Due to Related Party 35,293    
Equity Method Investment, Summarized Financial Information, Assets 1,656,354    
Equity Method Investments Summarized Financial Information Secured Debt, net 524,052    
Equity Method Investment Summarized Financial Information Accounts payable and accrued liabilities 25,487    
Equity Method Investment, Summarized Financial Information, Liabilities 549,539    
Equity Method Investment Summarized Financial Information, Equity 1,106,815    
Equity Method Investment, Summarized Financial Information, Liabilities and Equity $ 1,656,354    
Investment in unconsolidated entities   $ 0