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Debt (UNITED DOMINION REALTY, L.P.) (Details Textual) (USD $)
 3 Months Ended 12 Months Ended 3 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
UDR Bank Credit Facility [Member]
Mar. 31, 2013
UDR Bank Credit Facility [Member]
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]
Dec. 31, 2012
Fannie Mae credit facilities [Member]
Mar. 31, 2013
Fannie Mae credit facilities [Member]
Fixed Rate Debt [Member]
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
Mortgages [Member]
Fixed Rate Debt [Member]
Dec. 31, 2012
Mortgages [Member]
Fixed Rate Debt [Member]
Mar. 31, 2013
Mortgages [Member]
Variable Rate Debt [Member]
Dec. 31, 2012
Mortgages [Member]
Variable Rate Debt [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]
Mar. 31, 2013
Unsecured Revolving Credit Facility due October 2015 [Member]
Dec. 31, 2012
Unsecured Revolving Credit Facility due October 2015 [Member]
Mar. 31, 2013
2.90% Term Notes due January 2016 [Member]
Mar. 31, 2013
Five Point Two Five Percent, Medium Term Notes, Due January 2016 [Member]
Mar. 31, 2013
4.25% Medium-Term Notes due June 2018 [Member]
Mar. 31, 2012
4.25% Medium-Term Notes due June 2018 [Member]
Mar. 31, 2013
4.63% Medium-Term Notes due January 2022 [Member]
Dec. 31, 2012
4.63% Medium-Term Notes due January 2022 [Member]
Mar. 31, 2013
United Dominion Reality L.P. [Member]
Dec. 31, 2012
United Dominion Reality L.P. [Member]
Mar. 31, 2012
United Dominion Reality L.P. [Member]
Mar. 31, 2013
United Dominion Reality L.P. [Member]
UDR Bank Credit Facility [Member]
Financial Guarantee [Member]
Mar. 31, 2013
United Dominion Reality L.P. [Member]
Fixed Rate Debt [Member]
Dec. 31, 2012
United Dominion Reality L.P. [Member]
Fixed Rate Debt [Member]
Mar. 31, 2013
United Dominion Reality L.P. [Member]
Variable Rate Debt [Member]
Dec. 31, 2012
United Dominion Reality L.P. [Member]
Variable Rate Debt [Member]
Mar. 31, 2013
United Dominion Reality L.P. [Member]
Fannie Mae credit facilities [Member]
Mar. 31, 2013
United Dominion Reality L.P. [Member]
Fannie Mae credit facilities [Member]
Fixed Rate Debt [Member]
Mar. 31, 2013
United Dominion Reality L.P. [Member]
Fannie Mae credit facilities [Member]
Variable Rate Debt [Member]
Mar. 31, 2013
United Dominion Reality L.P. [Member]
Mortgages [Member]
Fixed Rate Debt [Member]
Dec. 31, 2012
United Dominion Reality L.P. [Member]
Mortgages [Member]
Fixed Rate Debt [Member]
Mar. 31, 2013
United Dominion Reality L.P. [Member]
Mortgages [Member]
Variable Rate Debt [Member]
Dec. 31, 2012
United Dominion Reality L.P. [Member]
Mortgages [Member]
Variable Rate Debt [Member]
Mar. 31, 2013
United Dominion Reality L.P. [Member]
Tax Exempt Notes Payable [Member]
Variable Rate Debt [Member]
Dec. 31, 2012
United Dominion Reality L.P. [Member]
Tax Exempt Notes Payable [Member]
Variable Rate Debt [Member]
Mar. 31, 2013
United Dominion Reality L.P. [Member]
2.90% Term Notes due January 2016 [Member]
Mar. 31, 2013
United Dominion Reality L.P. [Member]
2.90% Term Notes due January 2016 [Member]
Financial Guarantee [Member]
Mar. 31, 2013
United Dominion Reality L.P. [Member]
1.68% Term Notes due December 2016 [Member]
Financial Guarantee [Member]
Mar. 31, 2013
United Dominion Reality L.P. [Member]
Five Point Two Five Percent, Medium Term Notes, Due January 2016 [Member]
Mar. 31, 2013
United Dominion Reality L.P. [Member]
4.25% Medium-Term Notes due June 2018 [Member]
Mar. 31, 2013
United Dominion Reality L.P. [Member]
4.25% Medium-Term Notes due June 2018 [Member]
Financial Guarantee [Member]
Mar. 31, 2013
United Dominion Reality L.P. [Member]
4.63% Medium-Term Notes due January 2022 [Member]
Mar. 31, 2013
United Dominion Reality L.P. [Member]
4.63% Medium-Term Notes due January 2022 [Member]
Financial Guarantee [Member]
Mar. 31, 2013
Senior Notes [Member]
Fair Value, Measurements, Recurring [Member]
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Unsecured Revolving Credit Facility due October 2015 [Member]
Mar. 31, 2013
Line of Credit [Member]
Fair Value, Measurements, Recurring [Member]
Mar. 31, 2012
Line of Credit [Member]
Fair Value, Measurements, Recurring [Member]
Mar. 31, 2013
Line of Credit [Member]
Fair Value, Measurements, Recurring [Member]
United Dominion Reality L.P. [Member]
Dec. 31, 2012
Line of Credit [Member]
Fair Value, Measurements, Recurring [Member]
United Dominion Reality L.P. [Member]
Mar. 31, 2013
Line of Credit [Member]
Fair Value, Measurements, Recurring [Member]
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Dec. 31, 2012
Line of Credit [Member]
Fair Value, Measurements, Recurring [Member]
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Mar. 31, 2013
Line of Credit [Member]
Fair Value, Measurements, Recurring [Member]
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Fannie Mae credit facilities [Member]
Variable Rate Debt [Member]
Mar. 31, 2013
Line of Credit [Member]
Fair Value, Measurements, Recurring [Member]
Carrying (Reported) Amount, Fair Value Disclosure [Member]
United Dominion Reality L.P. [Member]
Dec. 31, 2012
Line of Credit [Member]
Fair Value, Measurements, Recurring [Member]
Carrying (Reported) Amount, Fair Value Disclosure [Member]
United Dominion Reality L.P. [Member]
Mar. 31, 2013
Line of Credit [Member]
Fair Value, Measurements, Recurring [Member]
Carrying (Reported) Amount, Fair Value Disclosure [Member]
United Dominion Reality L.P. [Member]
Fannie Mae credit facilities [Member]
Fixed Rate Debt [Member]
Dec. 31, 2012
Line of Credit [Member]
Fair Value, Measurements, Recurring [Member]
Carrying (Reported) Amount, Fair Value Disclosure [Member]
United Dominion Reality L.P. [Member]
Fannie Mae credit facilities [Member]
Fixed Rate Debt [Member]
Mar. 31, 2013
Line of Credit [Member]
Fair Value, Measurements, Recurring [Member]
Carrying (Reported) Amount, Fair Value Disclosure [Member]
United Dominion Reality L.P. [Member]
Fannie Mae credit facilities [Member]
Variable Rate Debt [Member]
Dec. 31, 2012
Line of Credit [Member]
Fair Value, Measurements, Recurring [Member]
Carrying (Reported) Amount, Fair Value Disclosure [Member]
United Dominion Reality L.P. [Member]
Fannie Mae credit facilities [Member]
Variable Rate Debt [Member]
Mar. 31, 2013
Mortgages [Member]
Fair Value, Measurements, Recurring [Member]
Mar. 31, 2012
Mortgages [Member]
Fair Value, Measurements, Recurring [Member]
Mar. 31, 2013
Mortgages [Member]
Fair Value, Measurements, Recurring [Member]
United Dominion Reality L.P. [Member]
Dec. 31, 2012
Mortgages [Member]
Fair Value, Measurements, Recurring [Member]
United Dominion Reality L.P. [Member]
Mar. 31, 2013
Mortgages [Member]
Fair Value, Measurements, Recurring [Member]
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Dec. 31, 2012
Mortgages [Member]
Fair Value, Measurements, Recurring [Member]
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Mar. 31, 2013
Mortgages [Member]
Fair Value, Measurements, Recurring [Member]
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Fannie Mae credit facilities [Member]
Fixed Rate Debt [Member]
Mar. 31, 2013
Mortgages [Member]
Fair Value, Measurements, Recurring [Member]
Carrying (Reported) Amount, Fair Value Disclosure [Member]
United Dominion Reality L.P. [Member]
Dec. 31, 2012
Mortgages [Member]
Fair Value, Measurements, Recurring [Member]
Carrying (Reported) Amount, Fair Value Disclosure [Member]
United Dominion Reality L.P. [Member]
Debt Instrument [Line Items]                                                                                                                                                      
Debt Instrument, Unamortized Premium                                                       $ 12,800,000   $ 13,800,000                                                                                          
Variable Rate Secured Debt Instruments Fair Value                                                                                                           211,409,000 [1] 211,409,000 [1] 137,187,000 [2] 137,187,000 [2] 211,409,000 211,409,000   137,187,000 137,187,000         37,415,000 [1] 37,415,000 [1] 37,415,000 [2] 37,415,000 [2] 37,415,000 37,415,000   37,415,000 37,415,000
Debt Instrument, Maturity Date Range, Start                   May 01, 2017       Dec. 01, 2014                                                 Dec. 31, 2015                                                                        
Total revolving credit facility     900,000,000 900,000,000           929,300,000                                                                                                                                  
Borrowings outstanding 840,500,000   76,000,000 170,000,000                                 76,000,000                                                               170,000,000                                            
Initial term of credit facilities (in years) 10 years   4 years           10 years                                                                                                                                    
Secured debt including debt on real estate held for sale         1,082,139,000 1,086,611,000 343,524,000 343,524,000     631,078,000 211,409,000 211,409,000 453,076,000 455,533,000 37,415,000 37,415,000 94,700,000 94,700,000                 964,989,000 967,239,000     763,387,000 765,637,000 201,602,000 201,602,000 507,600,000     392,953,000 394,999,000 37,415,000 37,415,000 27,000,000 27,000,000                               211,409,000     370,434,000 370,638,000 137,187,000 137,187,000             629,063,000    
Weighted average interest rate 4.34%       5.24%   1.63%             5.41%   1.09%   0.87%   1.15%   2.90% 5.25% 4.25%   4.63%   4.51%       5.16%   2.04%         5.41%                                                                        
Unamortized fair market adjustment 15,600,000 16,900,000                                           2,215,000 2,322,000 3,151,000 3,241,000                                                                                                
Notes payable minimum interest rates range                           3.43%   1.09%                                             3.43%                                                                        
Notes payable maximum interest rates range                           5.94%                                                 5.94%                                                                        
Guarantor borrowing capacity                                                             900,000,000                             250,000,000 100,000,000     300,000,000   400,000,000                                              
Debt Instrument, Maturity Date Range, End                   Dec. 01, 2019       May 01, 2019   Jul. 01, 2013                                             May 01, 2019   Jul. 01, 2013   Mar. 20, 2032   Jan. 01, 2016     Jan. 01, 2016 Jun. 01, 2018   Jan. 01, 2022                                                
Debt Instrument, Interest Rate at Period End                       2.06%                                                         1.09%   0.90%                                                                
Fixed Rate Secured Debt Instruments Fair Value                                                                                                           $ 681,792,000 [1] $ 689,295,000 [1] $ 395,484,000 [2] $ 399,389,000 [2] $ 629,063,000 $ 631,078,000   $ 370,434,000 $ 370,638,000         $ 487,297,000 [1] $ 494,728,000 [1] $ 423,373,000 [2] $ 429,973,000 [2] $ 453,076,000 $ 455,533,000   $ 392,953,000 $ 394,999,000
Debt, Weighted Average Interest Rate                   5.11%                                                     4.90% 2.52%                                                                          
[1] See Note 2, Significant Accounting Policies
[2] See Note 8, Derivatives and Hedging Activity