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Debt (UNITED DOMINION REALTY, L.P.) (Details Textual) (USD $)
 3 Months Ended 6 Months Ended 3 Months Ended 3 Months Ended 1 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
UDR Bank Credit Facility [Member]
Dec. 31, 2012
UDR Bank Credit Facility [Member]
Jun. 30, 2013
Fixed Rate Debt [Member]
Dec. 31, 2012
Fixed Rate Debt [Member]
Jun. 30, 2013
Variable Rate Debt [Member]
Dec. 31, 2012
Variable Rate Debt [Member]
Jun. 30, 2013
OneHundredMillionUnsecuredTermLoanDueJune2018 [Member]
Jun. 30, 2013
OneHundredMillionUnsecuredTermLoanDueJune2018 [Member]
Jun. 30, 2013
Fannie Mae credit facilities [Member]
Fixed Rate Debt [Member]
Dec. 31, 2012
Fannie Mae credit facilities [Member]
Fixed Rate Debt [Member]
Jun. 30, 2013
Fannie Mae credit facilities [Member]
Variable Rate Debt [Member]
Dec. 31, 2012
Fannie Mae credit facilities [Member]
Variable Rate Debt [Member]
Jun. 30, 2013
Mortgages [Member]
Fixed Rate Debt [Member]
Jun. 30, 2013
Mortgages [Member]
Fixed Rate Debt [Member]
Dec. 31, 2012
Mortgages [Member]
Fixed Rate Debt [Member]
Jun. 30, 2013
Mortgages [Member]
Variable Rate Debt [Member]
Dec. 31, 2012
Mortgages [Member]
Variable Rate Debt [Member]
Jun. 30, 2013
Tax Exempt Notes Payable [Member]
Variable Rate Debt [Member]
Dec. 31, 2012
Tax Exempt Notes Payable [Member]
Variable Rate Debt [Member]
Jun. 30, 2013
Unsecured Revolving Credit Facility due October 2015 [Member]
Dec. 31, 2012
Unsecured Revolving Credit Facility due October 2015 [Member]
Jun. 30, 2013
2.90% Term Notes due January 2016 [Member]
Jun. 30, 2013
Five Point Two Five Percent, Medium Term Notes, Due January 2016 [Member]
Jun. 30, 2013
4.25% Medium-Term Notes due June 2018 [Member]
Jun. 30, 2012
4.25% Medium-Term Notes due June 2018 [Member]
Jun. 30, 2013
4.63% Medium-Term Notes due January 2022 [Member]
Dec. 31, 2012
4.63% Medium-Term Notes due January 2022 [Member]
Jun. 30, 2013
United Dominion Reality L.P. [Member]
Dec. 31, 2012
United Dominion Reality L.P. [Member]
Jun. 30, 2012
United Dominion Reality L.P. [Member]
Jun. 30, 2013
United Dominion Reality L.P. [Member]
UDR Bank Credit Facility [Member]
Financial Guarantee [Member]
Jun. 30, 2013
United Dominion Reality L.P. [Member]
Fixed Rate Debt [Member]
Dec. 31, 2012
United Dominion Reality L.P. [Member]
Fixed Rate Debt [Member]
Jun. 30, 2013
United Dominion Reality L.P. [Member]
Variable Rate Debt [Member]
Dec. 31, 2012
United Dominion Reality L.P. [Member]
Variable Rate Debt [Member]
Jun. 30, 2013
United Dominion Reality L.P. [Member]
Fannie Mae credit facilities [Member]
Jun. 30, 2013
United Dominion Reality L.P. [Member]
Fannie Mae credit facilities [Member]
Fixed Rate Debt [Member]
Jun. 30, 2013
United Dominion Reality L.P. [Member]
Fannie Mae credit facilities [Member]
Variable Rate Debt [Member]
Jun. 30, 2013
United Dominion Reality L.P. [Member]
Mortgages [Member]
Fixed Rate Debt [Member]
Jun. 30, 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]
Jun. 30, 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]
Jun. 30, 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]
Jun. 30, 2013
United Dominion Reality L.P. [Member]
2.90% Term Notes due January 2016 [Member]
Jun. 30, 2013
United Dominion Reality L.P. [Member]
2.90% Term Notes due January 2016 [Member]
Financial Guarantee [Member]
Jun. 30, 2013
United Dominion Reality L.P. [Member]
1.68% Term Notes due December 2016 [Member]
Financial Guarantee [Member]
Jun. 30, 2013
United Dominion Reality L.P. [Member]
Five Point Two Five Percent, Medium Term Notes, Due January 2016 [Member]
Jun. 30, 2013
United Dominion Reality L.P. [Member]
4.25% Medium-Term Notes due June 2018 [Member]
Jun. 30, 2013
United Dominion Reality L.P. [Member]
4.25% Medium-Term Notes due June 2018 [Member]
Financial Guarantee [Member]
Jun. 30, 2013
United Dominion Reality L.P. [Member]
4.63% Medium-Term Notes due January 2022 [Member]
Jun. 30, 2013
United Dominion Reality L.P. [Member]
4.63% Medium-Term Notes due January 2022 [Member]
Financial Guarantee [Member]
Jun. 30, 2013
Senior Notes [Member]
Fair Value, Measurements, Recurring [Member]
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Unsecured Revolving Credit Facility due October 2015 [Member]
Jun. 30, 2013
Line of Credit [Member]
Fair Value, Measurements, Recurring [Member]
Jun. 30, 2012
Line of Credit [Member]
Fair Value, Measurements, Recurring [Member]
Jun. 30, 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]
Jun. 30, 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]
Jun. 30, 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]
Jun. 30, 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]
Jun. 30, 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]
Jun. 30, 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]
Jun. 30, 2013
Mortgages [Member]
Fair Value, Measurements, Recurring [Member]
Jun. 30, 2012
Mortgages [Member]
Fair Value, Measurements, Recurring [Member]
Jun. 30, 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]
Jun. 30, 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]
Jun. 30, 2013
Mortgages [Member]
Fair Value, Measurements, Recurring [Member]
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Fannie Mae credit facilities [Member]
Fixed Rate Debt [Member]
Jun. 30, 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, Description of Variable Rate Basis                   125 142.5                                                                                                                                        
Debt Instrument, Unamortized Premium                                                             $ 11,900,000   $ 13,800,000                                                                                            
Variable Rate Secured Debt Instruments Fair Value                                                                                                                   211,409,000 [1] 211,409,000 [1] 142,058,000 [2] 137,187,000 [2] 211,409,000 211,409,000   142,058,000 137,187,000           37,415,000 [1]   37,415,000 [2]   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             928,500,000                                                                                                                                      
Borrowings outstanding 839,700,000 839,700,000   228,500,000 76,000,000                                     76,000,000                                                                 228,500,000                                            
Initial term of credit facilities (in years) 10 years 10 years                                                                                                                                                          
Secured debt including debt on real estate held for sale           1,078,925,000 1,086,611,000 306,109,000 343,524,000       631,078,000 211,409,000 211,409,000 450,641,000 450,641,000 455,533,000 0 37,415,000 94,700,000 94,700,000                 939,148,000 967,239,000     770,090,000 765,637,000 169,058,000 201,602,000 521,200,000     390,923,000 390,923,000 394,999,000 0 37,415,000 27,000,000 27,000,000                               211,409,000     379,167,000 370,638,000 142,058,000 137,187,000             628,284,000    
Weighted average interest rate 4.20%         5.17%   1.40%               5.42%     0.00%   0.89%   1.30%   2.73% 5.25% 4.25%   4.63%   4.48%       5.07%   1.78%           5.42%                                                                        
Unamortized fair market adjustment 14,400,000 14,400,000 16,900,000                                               2,108,000 2,322,000 3,061,000 3,241,000                                                                                                  
Notes payable minimum interest rates range                                 3.43%                                                 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                       Jul. 01, 2023         May 01, 2019                                                   May 01, 2019       Mar. 20, 2032   Jun. 06, 2018     Jun. 06, 2018 Jun. 01, 2018   Jan. 01, 2022                                                
Debt Instrument, Interest Rate at Period End                           1.63%                                                             0.00%   1.05%                                                                
Reallocation of Credit Facilities Debt from General Partner   13,682,000 0                                                                                                                                                        
Fixed Rate Secured Debt Instruments Fair Value                                                                                                                   $ 658,532,000 [1] $ 689,295,000 [1] $ 392,762,000 [2] $ 399,389,000 [2] $ 628,284,000 $ 631,078,000   $ 379,167,000 $ 370,638,000         $ 471,742,000 [1] $ 494,728,000 [1] $ 409,771,000 [2] $ 429,973,000 [2] $ 450,641,000 $ 455,533,000   $ 390,923,000 $ 394,999,000
Debt, Weighted Average Interest Rate                       4.99%                                                       4.71% 1.92%                                                                            
[1] See Note 2, Significant Accounting Policies
[2] See Note 8, Derivatives and Hedging Activity