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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 9 Months Ended 3 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2014
Fixed Rate Debt [Member]
Dec. 31, 2013
Fixed Rate Debt [Member]
Sep. 30, 2014
Variable Rate Debt [Member]
Dec. 31, 2013
Variable Rate Debt [Member]
Sep. 30, 2014
3.75 MTN Due July 2024 [Member]
Jun. 26, 2014
3.75 MTN Due July 2024 [Member]
Sep. 30, 2014
Mortgages Notes Payable [Member]
Fixed Rate Debt [Member]
Sep. 30, 2014
Mortgages Notes Payable [Member]
Fixed Rate Debt [Member]
Dec. 31, 2013
Mortgages Notes Payable [Member]
Fixed Rate Debt [Member]
Sep. 30, 2014
Mortgages Notes Payable [Member]
Variable Rate Debt [Member]
Dec. 31, 2013
Mortgages Notes Payable [Member]
Variable Rate Debt [Member]
Sep. 30, 2014
Debt Assumed As Part of Acquisition [Member]
Sep. 30, 2013
Debt Assumed As Part of Acquisition [Member]
Sep. 30, 2014
Debt Assumed As Part of Acquisition [Member]
Sep. 30, 2013
Debt Assumed As Part of Acquisition [Member]
Sep. 30, 2014
Tax Exempt Notes Payable [Member]
Variable Rate Debt [Member]
Dec. 31, 2013
Tax Exempt Notes Payable [Member]
Variable Rate Debt [Member]
Sep. 30, 2014
Fannie Mae credit facilities [Member]
Fixed Rate Debt [Member]
credit_facility
Dec. 31, 2013
Fannie Mae credit facilities [Member]
Fixed Rate Debt [Member]
Sep. 30, 2014
Fannie Mae credit facilities [Member]
Variable Rate Debt [Member]
Dec. 31, 2013
Fannie Mae credit facilities [Member]
Variable Rate Debt [Member]
Sep. 30, 2014
Tax Exempt Secured Notes Payable [Member]
Variable Rate Debt [Member]
Sep. 30, 2014
Tax Exempt Secured Notes Payable [Member]
Variable Rate Debt [Member]
Sep. 30, 2014
UDR Bank Credit Facility [Member]
Dec. 31, 2013
UDR Bank Credit Facility [Member]
Sep. 30, 2014
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]
Sep. 30, 2014
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]
Sep. 30, 2014
End of range of inital term of debt [Member]
Fannie Mae credit facilities [Member]
Dec. 31, 2012
End of range of inital term of debt [Member]
Fannie Mae credit facilities [Member]
Debt Instrument [Line Items]                                                              
Medium-term Notes               $ 300,000,000                                              
Debt Instrument, Interest Rate, Stated Percentage             3.75%                                                
Percentage of Debt Instrument Price             99.652%                                                
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 26.90%                                                            
Secured debt amount of real estate owned which is unencumbered 6,100,000,000                                                            
Percentage of secured debt of real estate owned which is unencumbered 73.10%                                                            
Number of secured credit facilities                                       3                      
Credit facilities with aggregate commitment 835,200,000                                     835,200,000           900,000,000 900,000,000        
Debt Instrument, Term                                                           10 years 10 years
Secured debt including debt on real estate held for sale     1,061,926,000 1,072,373,000 337,446,000 369,704,000     438,172,000 438,172,000 445,706,000 31,337,000 63,595,000         94,700,000 94,700,000   626,667,000 211,409,000 211,409,000         211,409,000 623,754,000    
Weighted average interest rate 3.98%   5.19%   1.39%   3.75%   5.47%     1.94%           0.77%                          
Unamortized fair market adjustment 8,000,000 11,800,000         1,000,000                                                
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, 2023       Mar. 20, 2032              
Notes payable minimum interest rates range                   3.43%                             0.74%            
Notes payable maximum interest rates range                   5.94%                             0.79%            
Amortization of Debt Discount (Premium)                           $ 1,300,000 $ 1,300,000 $ 3,800,000 $ 3,800,000