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Debt (UNITED DOMINION REALTY, L.P.) (Details Textual) (USD $)
 3 Months Ended 3 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 0 Months Ended 9 Months Ended 3 Months Ended 0 Months Ended 3 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2014
UDR Bank Credit Facility [Member]
Dec. 31, 2013
UDR Bank Credit Facility [Member]
Sep. 30, 2014
Fixed Rate Debt [Member]
Dec. 31, 2013
Fixed Rate Debt [Member]
Sep. 30, 2014
Fannie Mae [Member]
Sep. 30, 2014
Variable Rate Debt [Member]
Dec. 31, 2013
Variable Rate Debt [Member]
Sep. 30, 2014
Fannie Mae credit facilities [Member]
Fixed Rate Debt [Member]
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
Mortgages [Member]
Fixed Rate Debt [Member]
Sep. 30, 2014
Mortgages [Member]
Fixed Rate Debt [Member]
Dec. 31, 2013
Mortgages [Member]
Fixed Rate Debt [Member]
Sep. 30, 2014
Mortgages [Member]
Variable Rate Debt [Member]
Dec. 31, 2013
Mortgages [Member]
Variable Rate Debt [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
Unsecured Revolving Credit Facility due October 2015 [Member]
Dec. 31, 2013
Unsecured Revolving Credit Facility due October 2015 [Member]
Sep. 30, 2014
2.90% Term Notes due January 2016 [Member]
Sep. 30, 2014
Five Point Two Five Percent, Medium Term Notes, Due January 2016 [Member]
Sep. 30, 2014
4.25% Medium-Term Notes due June 2018 [Member]
Dec. 31, 2013
4.25% Medium-Term Notes due June 2018 [Member]
Sep. 26, 2013
ThreePointSevenTermNotesDueOctober2020 [Member]
Sep. 30, 2014
ThreePointSevenTermNotesDueOctober2020 [Member]
Sep. 30, 2014
4.63% Medium-Term Notes due January 2022 [Member]
Dec. 31, 2013
4.63% Medium-Term Notes due January 2022 [Member]
Jun. 27, 2014
3.75 MTN Due July 2024 [Member]
Sep. 30, 2014
3.75 MTN Due July 2024 [Member]
Sep. 30, 2014
United Dominion Reality L.P. [Member]
Dec. 31, 2013
United Dominion Reality L.P. [Member]
Sep. 30, 2014
United Dominion Reality L.P. [Member]
UDR Bank Credit Facility [Member]
Financial Guarantee [Member]
Sep. 30, 2014
United Dominion Reality L.P. [Member]
Fixed Rate Debt [Member]
Dec. 31, 2013
United Dominion Reality L.P. [Member]
Fixed Rate Debt [Member]
Sep. 30, 2014
United Dominion Reality L.P. [Member]
Variable Rate Debt [Member]
Dec. 31, 2013
United Dominion Reality L.P. [Member]
Variable Rate Debt [Member]
Sep. 30, 2014
United Dominion Reality L.P. [Member]
Fannie Mae credit facilities [Member]
Fixed Rate Debt [Member]
Sep. 30, 2014
United Dominion Reality L.P. [Member]
Fannie Mae credit facilities [Member]
Variable Rate Debt [Member]
Sep. 30, 2014
United Dominion Reality L.P. [Member]
Mortgages [Member]
Fixed Rate Debt [Member]
Sep. 30, 2014
United Dominion Reality L.P. [Member]
Mortgages [Member]
Fixed Rate Debt [Member]
Dec. 31, 2013
United Dominion Reality L.P. [Member]
Mortgages [Member]
Fixed Rate Debt [Member]
Sep. 30, 2014
United Dominion Reality L.P. [Member]
Tax Exempt Notes Payable [Member]
Variable Rate Debt [Member]
Dec. 31, 2013
United Dominion Reality L.P. [Member]
Tax Exempt Notes Payable [Member]
Variable Rate Debt [Member]
Sep. 30, 2014
United Dominion Reality L.P. [Member]
2.90% Term Notes due January 2016 [Member]
Sep. 30, 2014
United Dominion Reality L.P. [Member]
2.90% Term Notes due January 2016 [Member]
Financial Guarantee [Member]
Sep. 30, 2014
United Dominion Reality L.P. [Member]
1.68% Term Notes due December 2016 [Member]
Financial Guarantee [Member]
Sep. 30, 2014
United Dominion Reality L.P. [Member]
Five Point Two Five Percent, Medium Term Notes, Due January 2016 [Member]
Sep. 30, 2014
United Dominion Reality L.P. [Member]
4.25% Medium-Term Notes due June 2018 [Member]
Sep. 30, 2014
United Dominion Reality L.P. [Member]
4.25% Medium-Term Notes due June 2018 [Member]
Financial Guarantee [Member]
Sep. 30, 2014
United Dominion Reality L.P. [Member]
Three point seven percent medium term note due October 2020 [Member]
Financial Guarantee [Member]
Sep. 30, 2014
United Dominion Reality L.P. [Member]
4.63% Medium-Term Notes due January 2022 [Member]
Sep. 30, 2014
United Dominion Reality L.P. [Member]
4.63% Medium-Term Notes due January 2022 [Member]
Financial Guarantee [Member]
Sep. 30, 2014
United Dominion Reality L.P. [Member]
3.75 MTN Due July 2024 [Member]
Financial Guarantee [Member]
Sep. 30, 2014
Mortgages [Member]
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2013
Mortgages [Member]
Fair Value, Measurements, Recurring [Member]
Sep. 30, 2014
Mortgages [Member]
Fair Value, Measurements, Recurring [Member]
United Dominion Reality L.P. [Member]
Dec. 31, 2013
Mortgages [Member]
Fair Value, Measurements, Recurring [Member]
United Dominion Reality L.P. [Member]
Sep. 30, 2014
Mortgages [Member]
Fair Value, Measurements, Recurring [Member]
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Dec. 31, 2013
Mortgages [Member]
Fair Value, Measurements, Recurring [Member]
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Sep. 30, 2014
Mortgages [Member]
Fair Value, Measurements, Recurring [Member]
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Fannie Mae credit facilities [Member]
Fixed Rate Debt [Member]
Sep. 30, 2014
Mortgages [Member]
Fair Value, Measurements, Recurring [Member]
Carrying (Reported) Amount, Fair Value Disclosure [Member]
United Dominion Reality L.P. [Member]
Dec. 31, 2013
Mortgages [Member]
Fair Value, Measurements, Recurring [Member]
Carrying (Reported) Amount, Fair Value Disclosure [Member]
United Dominion Reality L.P. [Member]
Sep. 30, 2014
Line of Credit [Member]
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2013
Line of Credit [Member]
Fair Value, Measurements, Recurring [Member]
Sep. 30, 2014
Line of Credit [Member]
Fair Value, Measurements, Recurring [Member]
United Dominion Reality L.P. [Member]
Dec. 31, 2013
Line of Credit [Member]
Fair Value, Measurements, Recurring [Member]
United Dominion Reality L.P. [Member]
Sep. 30, 2014
Line of Credit [Member]
Fair Value, Measurements, Recurring [Member]
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Dec. 31, 2013
Line of Credit [Member]
Fair Value, Measurements, Recurring [Member]
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Sep. 30, 2014
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]
Sep. 30, 2014
Line of Credit [Member]
Fair Value, Measurements, Recurring [Member]
Carrying (Reported) Amount, Fair Value Disclosure [Member]
United Dominion Reality L.P. [Member]
Dec. 31, 2013
Line of Credit [Member]
Fair Value, Measurements, Recurring [Member]
Carrying (Reported) Amount, Fair Value Disclosure [Member]
United Dominion Reality L.P. [Member]
Sep. 30, 2014
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, 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]
Sep. 30, 2014
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, 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
Beginning of range of initial term of debt [Member]
Fannie Mae credit facilities [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]                                                                                                                                                                  
Debt Instrument, Unamortized Premium                                                                 $ 7,100,000 $ 10,000,000                                                                                              
Variable Rate Secured Debt Instruments Fair Value                                                                                                                 31,337,000 [1] 63,595,000 [1]     31,337,000 63,595,000       211,409,000 [1] 211,409,000 [1] 142,059,000 [2] 142,059,000 [2] 211,409,000 211,409,000   142,059,000 142,059,000              
Debt Instrument, Maturity Date Range, Start                   May 01, 2017         Dec. 01, 2014                                                       Dec. 31, 2015                                                                            
Total revolving credit facility 835,200,000   900,000,000 900,000,000           835,200,000                                                                                                                                              
Borrowings outstanding 2,200,000   160,000,000 0                                 160,000,000 0                                                                                                                      
Debt Instrument, Term             10 years                                                                                                                                               7 years 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   626,667,000 211,409,000 211,409,000 438,172,000 438,172,000 445,706,000 31,337,000 63,595,000 94,700,000 94,700,000                         928,273,000 934,865,000   759,215,000 765,806,000 169,058,000 169,059,000     380,506,000 380,506,000 386,803,000 27,000,000 27,000,000                                 623,754,000                 211,409,000     378,709,000 379,003,000 142,058,000 142,059,000      
Weighted average interest rate 3.98%       5.19%     1.39%           5.47%     1.94%   0.77%   1.10%   2.17% 5.25% 4.25%     3.70% 4.63%     3.75% 4.47%     5.09%   1.70%         5.46%                                                                            
Unamortized fair market adjustment 8,000,000 11,800,000                                             1,786,000 1,893,000     2,792,000 2,882,000   1,000,000                                                                                                  
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     300,000,000 300,000,000   400,000,000 300,000,000                                                  
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, Maturity Date                                                     Oct. 31, 2020       Jul. 01, 2024                                                                                                    
Debt Instrument, Interest Rate at Period End                       1.58%                                                                 0.74%                                                                        
Fixed Rate Secured Debt Instruments Fair Value                                                                                                                 $ 451,582,000 [1] $ 466,375,000 [1] $ 392,883,000 [2] $ 403,695,000 [2] $ 438,172,000 $ 445,706,000   $ 380,506,000 $ 386,803,000 $ 655,035,000 [1] $ 661,094,000 [1] $ 394,849,000 [2] $ 394,239,000 [2] $ 623,754,000 $ 626,667,000   $ 378,709,000 $ 379,003,000              
Debt, Weighted Average Interest Rate                   4.99%                                                           4.71% 1.88%                                                                                
[1] See Note 2, Significant Accounting Policies
[2] See Note 8, Derivatives and Hedging Activity