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Reportable Segments (UNITED DOMINION REALTY, L.P.) (Details) (USD $)
 3 Months Ended
Mar. 31, 2013
Segments
Mar. 31, 2012
Dec. 31, 2012
Dec. 31, 2011
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 $ 184,301,000 $ 189,343,000    
Reportable apartment home segment NOI 125,316,000 128,114,000    
Reconciling items:        
Property management (5,068,000) (5,207,000)    
Other operating expenses (1,643,000) (1,383,000)    
Depreciation and amortization (83,442,000) (94,247,000)    
General and administrative (9,476,000) (9,379,000)    
Insurance Recoveries 3,021,000 0    
Net gain on sale of depreciable property 0 80,525,000    
Non-controlling interests (4,000) (52,000)    
Net (loss)/income attributable to Entity (268,000) 83,156,000    
Reportable apartment home segment assets:        
Total segment assets 8,182,116,000   8,055,828,000  
Accumulated depreciation (2,007,482,000)   (1,924,682,000)  
Total real estate owned, net of accumulated depreciation 6,174,634,000   6,131,146,000  
Reconciling items:        
Cash and cash equivalents 7,121,000 3,558,000 12,115,000 12,503,000
Restricted cash 24,628,000   23,561,000  
Deferred financing costs, net 23,654,000   24,990,000  
Other assets 133,154,000   125,654,000  
Total assets 6,890,781,000   6,859,103,000  
Reportable Segment (Textual) [Abstract]        
Number of reportable segments 2      
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 6,900,000 9,900,000    
Same Store 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 58,493,000 55,588,000    
Reportable apartment home segment NOI 41,315,000 38,736,000    
Reportable apartment home segment assets:        
Total segment assets 2,379,289,000   2,376,459,000  
Same Store 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 41,351,000 39,725,000    
Reportable apartment home segment NOI 28,762,000 27,565,000    
Reportable apartment home segment assets:        
Total segment assets 1,421,806,000   1,419,873,000  
Same Store Communities Northeast 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 14,099,000 13,144,000    
Reportable apartment home segment NOI 10,071,000 9,301,000    
Reportable apartment home segment assets:        
Total segment assets 725,235,000   723,437,000  
Same Store 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 28,544,000 27,013,000    
Reportable apartment home segment NOI 18,705,000 17,594,000    
Reportable apartment home segment assets:        
Total segment assets 875,841,000   870,207,000  
Same Store 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 11,426,000 10,581,000    
Reportable apartment home segment NOI 6,883,000 6,265,000    
Reportable apartment home segment assets:        
Total segment assets 413,583,000   413,085,000  
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 30,388,000 43,292,000    
Reportable apartment home segment NOI 19,580,000 28,653,000    
Reportable apartment home segment assets:        
Total segment assets 2,366,362,000   2,252,767,000  
Reportable Segments Additional (Textual) [Abstract]        
Capital expenditures related to segments 346,000 2,400,000    
United Dominion Reality L.P. [Member]
        
Segment Reporting Information [Line Items]        
Related Party Transaction, Management Fee Percentage 2.75%      
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 100,060,000 99,268,000    
Reportable apartment home segment NOI 70,123,000 69,538,000    
Reconciling items:        
Property management (2,752,000) (2,730,000)    
Other operating expenses (1,386,000) (4,049,000)    
Depreciation and amortization (45,393,000) (51,677,000)    
Interest (9,262,000) (12,970,000)    
General and administrative (5,575,000) (4,920,000)    
Insurance Recoveries (2,019,000) 0    
Net gain on sale of depreciable property 0 (84,000)    
Non-controlling interests (45,000) (34,000)    
Net (loss)/income attributable to Entity 7,729,000 (6,926,000)    
Reportable apartment home segment assets:        
Total segment assets 4,210,480,000   4,182,920,000  
Accumulated depreciation (1,142,440,000)   (1,097,133,000)  
Total real estate owned, net of accumulated depreciation 3,068,040,000   3,085,787,000  
Reconciling items:        
Cash and cash equivalents 2,951,000 961,000 2,804,000 704,000
Restricted cash 13,389,000   12,926,000  
Deferred financing costs, net 5,745,000   6,072,000  
Other assets 35,947,000   28,665,000  
Total assets 3,126,072,000   3,136,254,000  
Reportable Segment (Textual) [Abstract]        
Number of reportable segments 2      
Condition for Community considered to have stabilized occupancy once it achieves 90% occupancy for at least three consecutive months      
Number of Tenants or related group of tenants that contributed 10% or more of company total revenue 0 0    
Reportable Segments Additional (Textual) [Abstract]        
Capital expenditures related to segments 3,900,000 6,100,000    
United Dominion Reality L.P. [Member] | Same Store 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 44,571,000 42,525,000    
Reportable apartment home segment NOI 31,701,000 29,818,000    
Reportable apartment home segment assets:        
Total segment assets 1,723,544,000   1,721,252,000  
United Dominion Reality L.P. [Member] | Same Store 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 16,911,000 16,336,000    
Reportable apartment home segment NOI 11,533,000 11,172,000    
Reportable apartment home segment assets:        
Total segment assets 702,801,000   701,741,000  
United Dominion Reality L.P. [Member] | Same Store Communities Northeast 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 8,906,000 8,374,000    
Reportable apartment home segment NOI 6,475,000 6,047,000    
Reportable apartment home segment assets:        
Total segment assets 434,657,000   434,138,000  
United Dominion Reality L.P. [Member] | Same Store 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 10,586,000 9,985,000    
Reportable apartment home segment NOI 7,005,000 6,577,000    
Reportable apartment home segment assets:        
Total segment assets 323,577,000   322,882,000  
United Dominion Reality L.P. [Member] | Same Store 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 5,143,000 4,784,000    
Reportable apartment home segment NOI 3,179,000 2,986,000    
Reportable apartment home segment assets:        
Total segment assets 185,654,000   185,501,000  
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 13,943,000 17,264,000    
Reportable apartment home segment NOI 10,230,000 12,938,000    
Reportable apartment home segment assets:        
Total segment assets 840,247,000   817,406,000  
Reportable Segments Additional (Textual) [Abstract]        
Capital expenditures related to segments $ 121,000 $ 400,000