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Secured and Unsecured Debt (Details Textual 1) (USD $)
 1 Months Ended 3 Months Ended 3 Months Ended 0 Months Ended 9 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended
Jun. 30, 2013
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2014
Five Point Five Zero Percent, Medium Term Notes, Due April 2014 [Member]
Dec. 31, 2013
Five Point Five Zero Percent, Medium Term Notes, Due April 2014 [Member]
Sep. 26, 2013
ThreePointSevenTermNotesDueOctober2020 [Member]
Sep. 30, 2014
ThreePointSevenTermNotesDueOctober2020 [Member]
Dec. 31, 2013
ThreePointSevenTermNotesDueOctober2020 [Member]
Sep. 30, 2013
ThreePointSevenTermNotesDueOctober2020 [Member]
Sep. 30, 2014
1.67% Term Notes due December 2016 [Member]
Dec. 31, 2012
1.67% Term Notes due December 2016 [Member]
Dec. 31, 2013
1.67% Term Notes due December 2016 [Member]
Sep. 30, 2014
2.90% Term Notes due January 2016 [Member]
Dec. 31, 2013
2.90% Term Notes due January 2016 [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]
Sep. 30, 2014
2.68% Term Notes due December 2016 [Member]
Dec. 31, 2013
2.68% Term Notes due December 2016 [Member]
Sep. 30, 2014
UDR Bank Credit Facility [Member]
Dec. 31, 2013
UDR Bank Credit Facility [Member]
Dec. 31, 2012
Beginning of range of initial term of debt [Member]
Line of Credit [Member]
Sep. 30, 2014
Fannie Mae [Member]
Unsecured Debt (Textual) [Abstract]                                            
Total revolving credit facility   $ 835,200,000                                 $ 900,000,000 $ 900,000,000    
Increase in maximum borrowing capacity of unsecured revolving credit facility                                     1,450,000,000      
Credit facility interest rate 100                                          
Line of Credit Facility, Commitment Fee Description 15                                          
Fixed interest rate       5.50% 5.50%     0.00% 3.70% 1.30%   1.65% 2.73% 2.90% 4.63% 4.63% 2.50% 2.68%        
Interest rate                                     1.10% 1.30%    
Line of Credit Facility, Amount Outstanding   2,200,000                                 160,000,000 0    
Debt Instrument, Maturity Date           Oct. 31, 2020         Jun. 01, 2018                      
Unamortized discount   8,000,000 11,800,000 3,000 20,000                   2,792,000 2,882,000            
Senior Notes       $ 0 $ 128,480,000   $ 299,952,000 $ 299,946,000   $ 35,000,000   $ 35,000,000 $ 215,000,000 $ 250,000,000 $ 397,387,000 $ 397,118,000 $ 100,000,000 $ 65,000,000        
Debt Instrument, Interest Rate During Period   3.98%   0.00%     3.70%     1.30%     2.17%   4.63%   1.53%          
Debt Instrument, Term                                         7 years 10 years