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Reportable Segments (UNITED DOMINION REALTY, L.P.) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Dec. 31, 2010
Summary of rental income and NOI for UDRs reportable segments and reconciliation of NOI to loss from continuing operations            
Reportable apartment home segment rental income $ 190,690 $ 177,218 $ 380,033 $ 347,720    
Reportable apartment home segment NOI 128,911 118,070 257,025 228,867    
Reconciling items:            
Property management (5,244) (4,873) (10,451) (9,562)    
Other operating expenses (1,434) (1,585) (2,817) (3,089)    
Depreciation and amortization (84,474) (91,161) (178,721) (175,276)    
Interest (41,542) (37,844) (76,287) (78,561)    
General and administrative (13,738) (12,875) (23,117) (23,505)    
Net gain on sale of depreciable property 172,006 44,658 252,531 44,699    
Non-controlling interests (43) (37) (95) (88)    
Net income/(loss) attributable to Entity 150,352 14,651 233,508 (13,224)    
Reportable apartment home segment assets:            
Total segment assets 7,761,245   7,761,245   8,074,471  
Accumulated depreciation (1,769,530)   (1,769,530)   (1,831,727)  
Total real estate owned, net of accumulated depreciation 5,991,715   5,991,715   6,242,744  
Reconciling items:            
Cash and cash equivalents 184,112 21,634 184,112 21,634 12,503 9,486
Restricted cash 24,580   24,580   24,634  
Deferred financing costs, net 28,579   28,579   30,068  
Other assets 124,128   124,128   198,365  
Total assets 6,972,621   6,972,621   6,721,354  
Reportable Segment (Textual) [Abstract]            
Condition for Community considered to have stabilized occupancy 90% occupancy for at least three consecutive months          
Percent occupancy to be considered a community     90.00%      
Time to maintain percent occupancy to be considered a community     3 months      
Number of Tenants or related group of tenants that contributed 10% or more of company total revenue 0          
Reportable Segments Additional (Textual) [Abstract]            
Capital expenditures related to segments 15,100 10,300 24,500 17,200    
Same Communities Western Region [Member]
            
Summary of rental income and NOI for UDRs reportable segments and reconciliation of NOI to loss from continuing operations            
Reportable apartment home segment rental income 54,740 51,450 108,031 101,627    
Reportable apartment home segment NOI 38,130 35,569 75,214 69,661    
Reportable apartment home segment assets:            
Total segment assets 2,274,841   2,274,841   2,260,859  
Same Communities Mid-Atlantic Region [Member]
            
Summary of rental income and NOI for UDRs reportable segments and reconciliation of NOI to loss from continuing operations            
Reportable apartment home segment rental income 39,063 37,482 77,572 74,343    
Reportable apartment home segment NOI 27,086 25,964 53,765 51,030    
Reportable apartment home segment assets:            
Total segment assets 1,346,780   1,346,780   1,340,679  
Same Communities Southeastern Region [Member]
            
Summary of rental income and NOI for UDRs reportable segments and reconciliation of NOI to loss from continuing operations            
Reportable apartment home segment rental income 27,364 26,081 54,377 51,889    
Reportable apartment home segment NOI 17,764 16,280 35,358 32,516    
Reportable apartment home segment assets:            
Total segment assets 862,330   862,330   852,572  
Same Communities Southwestern Region [Member]
            
Summary of rental income and NOI for UDRs reportable segments and reconciliation of NOI to loss from continuing operations            
Reportable apartment home segment rental income 10,855 10,019 21,435 19,808    
Reportable apartment home segment NOI 6,229 5,766 12,495 10,995    
Reportable apartment home segment assets:            
Total segment assets 411,699   411,699   409,751  
Non-Mature communities/Other [Member]
            
Summary of rental income and NOI for UDRs reportable segments and reconciliation of NOI to loss from continuing operations            
Reportable apartment home segment rental income 58,668 52,186 118,618 100,053    
Reportable apartment home segment NOI 39,702 34,491 80,193 64,665    
Reportable apartment home segment assets:            
Total segment assets 2,865,595   2,865,595   3,210,610  
Reportable Segments Additional (Textual) [Abstract]            
Capital expenditures related to segments 2,200 3,400 5,100 5,400    
United Dominion Reality L.P. [Member]
            
Summary of rental income and NOI for UDRs reportable segments and reconciliation of NOI to loss from continuing operations            
Reportable apartment home segment rental income 101,408 96,133 200,676 185,962    
Reportable apartment home segment NOI 71,150 65,924 140,688 125,436    
Reconciling items:            
Property management (2,789) (2,644) (5,519) (5,114)    
Other operating expenses (4,095) (1,447) (8,144) (2,805)    
Depreciation and amortization (46,733) (50,225) (98,410) (91,383)    
Interest (12,891) (13,844) (25,861) (25,794)    
General and administrative (4,505) (6,294) (9,425) (10,874)    
Net gain on sale of depreciable property 51,266 16,038 51,182 16,038    
Non-controlling interests (231) (32) (265) (59)    
Net income/(loss) attributable to Entity 51,172 7,476 44,246 5,445    
Reportable apartment home segment assets:            
Total segment assets 4,139,258   4,139,258   4,205,298  
Accumulated depreciation (1,015,594)   (1,015,594)   (976,358)  
Total real estate owned, net of accumulated depreciation 3,123,664   3,123,664   3,228,940  
Reconciling items:            
Cash and cash equivalents 1,174 7,692 1,174 7,692 704 920
Restricted cash 13,633   13,633   12,568  
Deferred financing costs, net 6,714   6,714   8,184  
Other assets 32,881   32,881   41,771  
Total assets 3,178,066   3,178,066   3,292,167  
Reportable Segment (Textual) [Abstract]            
Condition for Community considered to have stabilized occupancy once it achieves 90% occupancy for at least three consecutive months          
Reportable Segments Additional (Textual) [Abstract]            
Capital expenditures related to segments 8,500 6,000 14,300 11,000    
United Dominion Reality L.P. [Member] | Same Communities Western Region [Member]
            
Summary of rental income and NOI for UDRs reportable segments and reconciliation of NOI to loss from continuing operations            
Reportable apartment home segment rental income 43,749 41,157 86,275 81,190    
Reportable apartment home segment NOI 30,877 28,807 60,695 56,264    
Reportable apartment home segment assets:            
Total segment assets 1,711,270   1,711,270   1,699,311  
United Dominion Reality L.P. [Member] | Same Communities Mid-Atlantic Region [Member]
            
Summary of rental income and NOI for UDRs reportable segments and reconciliation of NOI to loss from continuing operations            
Reportable apartment home segment rental income 16,594 15,946 32,930 31,620    
Reportable apartment home segment NOI 11,411 11,063 22,582 21,761    
Reportable apartment home segment assets:            
Total segment assets 699,653   699,653   697,217  
United Dominion Reality L.P. [Member] | Same Communities Southeastern Region [Member]
            
Summary of rental income and NOI for UDRs reportable segments and reconciliation of NOI to loss from continuing operations            
Reportable apartment home segment rental income 10,079 9,578 20,063 19,075    
Reportable apartment home segment NOI 6,592 5,907 13,169 11,924    
Reportable apartment home segment assets:            
Total segment assets 320,341   320,341   317,354  
United Dominion Reality L.P. [Member] | Same Communities Southwestern Region [Member]
            
Summary of rental income and NOI for UDRs reportable segments and reconciliation of NOI to loss from continuing operations            
Reportable apartment home segment rental income 4,957 4,510 9,741 8,962    
Reportable apartment home segment NOI 2,942 2,871 5,928 5,391    
Reportable apartment home segment assets:            
Total segment assets 185,012   185,012   184,158  
United Dominion Reality L.P. [Member] | Non-Mature communities/Other [Member]
            
Summary of rental income and NOI for UDRs reportable segments and reconciliation of NOI to loss from continuing operations            
Reportable apartment home segment rental income 26,029 24,942 51,667 45,115    
Reportable apartment home segment NOI 19,328 17,276 38,314 30,096    
Reportable apartment home segment assets:            
Total segment assets 1,222,982   1,222,982   1,307,258  
Reportable Segments Additional (Textual) [Abstract]            
Capital expenditures related to segments $ 873 $ 1,100 $ 1,591 $ 1,821