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Secured and Unsecured Debt (Details Textual) (USD $)
 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2013
Fixed Rate Debt [Member]
Dec. 31, 2012
Fixed Rate Debt [Member]
Mar. 31, 2013
Variable Rate Debt [Member]
Dec. 31, 2012
Variable Rate Debt [Member]
Mar. 31, 2013
Mortgages Notes Payable [Member]
Fixed Rate Debt [Member]
Dec. 31, 2012
Mortgages Notes Payable [Member]
Fixed Rate Debt [Member]
Mar. 31, 2013
Mortgages Notes Payable [Member]
Variable Rate Debt [Member]
Dec. 31, 2012
Mortgages Notes Payable [Member]
Variable Rate Debt [Member]
Mar. 31, 2013
Debt Assumed As Part of Acquisition [Member]
Mar. 31, 2012
Debt Assumed As Part of Acquisition [Member]
Mar. 31, 2013
Tax Exempt Notes Payable [Member]
Variable Rate Debt [Member]
Dec. 31, 2012
Tax Exempt Notes Payable [Member]
Variable Rate Debt [Member]
Dec. 31, 2012
Fannie Mae credit facilities [Member]
Mar. 31, 2013
Fannie Mae credit facilities [Member]
Fixed Rate Debt [Member]
credit_facility
Dec. 31, 2012
Fannie Mae credit facilities [Member]
Fixed Rate Debt [Member]
Mar. 31, 2013
Fannie Mae credit facilities [Member]
Variable Rate Debt [Member]
Dec. 31, 2012
Fannie Mae credit facilities [Member]
Variable Rate Debt [Member]
Mar. 31, 2013
Tax Exempt Secured Notes Payable [Member]
Variable Rate Debt [Member]
Dec. 31, 2012
UDR Bank Credit Facility [Member]
Mar. 31, 2013
UDR Bank Credit Facility [Member]
Mar. 31, 2013
Line of Credit [Member]
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Fair Value, Measurements, Recurring [Member]
Fannie Mae credit facilities [Member]
Variable Rate Debt [Member]
Mar. 31, 2013
Mortgages Notes Payable [Member]
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Fair Value, Measurements, Recurring [Member]
Fannie Mae credit facilities [Member]
Fixed Rate Debt [Member]
Secured Debt (Textual) [Abstract]                                                
Secured debt amount which encumbers real estate owned based upon book value $ 2,300,000,000                                              
Percentage of secured debt which encumbers real estate owned based upon book value 28.40%                                              
Secured debt amount of real estate owned which is unencumbered 5,900,000,000                                              
Percentage of secured debt of real estate owned which is unencumbered 71.60%                                              
Number of secured credit facilities                               3                
Credit facilities with aggregate commitment                               929,300,000         900,000,000 900,000,000    
Secured debt including debt on real estate held for sale     1,082,139,000 1,086,611,000 343,524,000 343,524,000 453,076,000 455,533,000 37,415,000 37,415,000     94,700,000 94,700,000     631,078,000 211,409,000 211,409,000       211,409,000 629,063,000
Initial term of credit facilities (in years) 10 years                           10 years           4 years      
Weighted average interest rate 4.34%   5.24%   1.63%   5.41%   1.09%       0.87%                      
Unamortized fair market adjustment 15,600,000 16,900,000                                            
Debt Instrument, Maturity Date Range, Start             Dec. 01, 2014                 May 01, 2017       Aug. 01, 2019        
Debt instrument, maturity date range, end             May 01, 2019   Jul. 01, 2013             Dec. 01, 2019       Mar. 20, 2032        
Notes payable minimum interest rates range             3.43%   1.09%                     0.86%        
Notes payable maximum interest rates range             5.94%                         0.90%        
Amortization of Debt Discount (Premium)                     $ 1,300,000 $ 1,100,000