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Reportable Segments (UNITED DOMINION REALTY, L.P.) (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2015 USD ($) Segments | Jun. 30, 2014 USD ($) | Jun. 30, 2015 USD ($) | Jun. 30, 2014 USD ($) | Jun. 30, 2013 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Same Store Communities | 35,250 |  | 35,250 |  |  |  |
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 | $ 215,862 | $ 203,706 | $ 435,615 | $ 401,745 |  |  |
Reportable apartment home segment NOI | (150,432) | (140,392) | (294,007) | (272,516) |  |  |
Reconciling items: |  |  |  |  |  |  |
Property management | 5,851 | 5,529 | (11,545) | (10,875) |  |  |
Other operating expenses | (1,769) | (2,171) | (3,535) | (4,106) |  |  |
General and administrative | (13,721) | (12,530) | (25,873) | (24,524) |  |  |
Casualty-related (recoveries)/charges, net | 843 | 0 | 1,839 | 500 |  |  |
Interest expense | 29,673 | 31,691 | 58,473 | 64,575 |  |  |
Gains/(loss) on sales of real estate owned | 79,042 | 26,709 | 79,042 | 51,003 |  |  |
Net (income)/loss attributable to noncontrolling interests | 0 | 2 | (7) | (6) |  |  |
Net income/(loss) attributable to OP unitholders | 86,855 | 30,007 | 160,677 | 48,368 |  |  |
Reportable apartment home segment assets: |  |  |  |  |  |  |
Total segment assets | 8,425,279 |  | 8,425,279 |  |  | $ 8,383,259 |
Real Estate Investment Property, Accumulated Depreciation | 2,557,949 |  | 2,557,949 |  |  | 2,434,772 |
Accumulated depreciation | (2,557,949) |  | (2,557,949) |  |  | (2,434,772) |
Total segment asset - net book value | 5,867,330 |  | 5,867,330 |  |  | 5,948,487 |
Reconciling items: |  |  |  |  |  |  |
Cash and cash equivalents | 2,990 | $ 26,816 | 2,990 | $ 26,816 |  | 15,224 | $ 30,249
Deferred financing costs, net | 19,930 |  | 19,930 |  |  | 22,686 |
Other assets | 96,259 |  | 96,259 |  |  | 105,202 |
Total assets | $ 6,939,730 |  | $ 6,939,730 |  |  | 6,846,534 |
Reportable Segment (Textual) [Abstract] |  |  |  |  |  |  |
Number of reportable segments | Segments | 2 |  |  |  |  |  |
Condition for Community considered to have stabilized occupancy |  |  | 0.9 |  |  |  |
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 | 0 | 0 | 0 |  |  |
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 | $ 68,646 | $ 64,004 | $ 135,595 | $ 126,405 |  |  |
Reportable apartment home segment NOI | (51,400) | (46,496) | (100,999) | (91,287) |  |  |
Reportable apartment home segment assets: |  |  |  |  |  |  |
Total segment assets | 2,608,586 |  | 2,608,586 |  |  | 2,592,156 |
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 | 43,536 | 42,644 | 86,331 | 84,694 |  |  |
Reportable apartment home segment NOI | (30,302) | (29,863) | (59,590) | (58,699) |  |  |
Reportable apartment home segment assets: |  |  |  |  |  |  |
Total segment assets | 1,541,420 |  | 1,541,420 |  |  | 1,533,993 |
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 | 21,436 | 20,294 | 42,328 | 40,096 |  |  |
Reportable apartment home segment NOI | (16,269) | (15,459) | (31,835) | (30,004) |  |  |
Reportable apartment home segment assets: |  |  |  |  |  |  |
Total segment assets | 1,081,035 |  | 1,081,035 |  |  | 1,076,656 |
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 | 26,540 | 25,063 | 52,505 | 49,774 |  |  |
Reportable apartment home segment NOI | (17,876) | (16,769) | (35,207) | (33,465) |  |  |
Reportable apartment home segment assets: |  |  |  |  |  |  |
Total segment assets | 738,595 |  | 738,595 |  |  | 733,068 |
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 | 14,363 | 13,623 | 28,470 | 27,090 |  |  |
Reportable apartment home segment NOI | (8,998) | (8,263) | (17,534) | (16,621) |  |  |
Reportable apartment home segment assets: |  |  |  |  |  |  |
Total segment assets | 443,526 |  | 443,526 |  |  | 440,721 |
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 | 38,243 | 35,409 | 74,582 | 67,378 |  |  |
Reportable apartment home segment NOI | (25,587) | (23,542) | (48,842) | (42,440) |  |  |
Reportable apartment home segment assets: |  |  |  |  |  |  |
Total segment assets | 2,012,117 |  | 2,012,117 |  |  | 2,006,665 |
Reportable Segment (Textual) [Abstract] |  |  |  |  |  |  |
SEC Schedule III, Real Estate, Improvements | 1,200 | 2,500 | 3,800 | 4,800 |  |  |
Total Communities [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 | $ 212,764 | 201,037 | $ 419,811 | 395,437 |  |  |
United Dominion Reality L.P. [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Same Store Communities | 18,969 |  | 18,969 |  |  |  |
Summary of rental income and NOI for UDRs reportable segments and reconciliation of NOI to loss from continuing operations |  |  |  |  |  |  |
Reportable apartment home segment NOI | $ (82,283) | (74,968) | $ (160,398) |  | $ (147,385) |  |
Reconciling items: |  |  |  |  |  |  |
Property management | (3,112) | (2,883) | (6,139) |  | (5,698) |  |
Other operating expenses | (1,496) | (1,451) | (2,986) |  | (2,887) |  |
Real estate depreciation and amortization | 44,100 | 44,697 | 88,578 | 88,968 |  |  |
General and administrative | (7,032) | (7,459) | (12,671) |  | (14,429) |  |
Casualty-related (recoveries)/charges, net | (280) | 0 | (873) |  | (500) |  |
Interest expense | 10,908 | 10,159 | 21,679 |  | 20,173 |  |
Gains/(loss) on sales of real estate owned | 32,375 | 16,285 | 56,998 | 40,687 |  |  |
Net (income)/loss attributable to noncontrolling interests | (347) | (178) | (741) |  | (458) |  |
Net income/(loss) attributable to OP unitholders | 47,383 | 24,426 | 83,729 | 54,959 | 54,959 |  |
Reportable apartment home segment assets: |  |  |  |  |  |  |
Total segment assets | 4,238,995 |  | 4,238,995 |  |  | 4,238,770 |
Real Estate Investment Property, Accumulated Depreciation | 1,474,834 |  | 1,474,834 |  |  | 1,403,303 |
Total segment asset - net book value | 2,764,161 |  | 2,764,161 |  |  | 2,835,467 |
Reconciling items: |  |  |  |  |  |  |
Cash and cash equivalents | 164 | $ 1,175 | 164 | $ 1,175 |  | 502 | $ 1,897
Restricted Cash | 14,456 |  | 14,456 |  |  | 13,811 |
Deferred financing costs, net | 3,707 |  | 3,707 |  |  | 4,475 |
Other assets | 23,090 |  | 23,090 |  |  | 24,029 |
Total assets | $ 2,805,578 |  | $ 2,805,578 |  |  | 2,878,284 |
Reportable Segment (Textual) [Abstract] |  |  |  |  |  |  |
Number of reportable segments | Segments | 2 |  |  |  |  |  |
Number of Tenants or related group of tenants that contributed 10% or more of company total revenue | 0 | 0 |  | 0 |  |  |
Related Party Transaction, Management Fee Percentage |  |  | 2.75% |  |  |  |
United Dominion Reality L.P. [Member] | Same-Store [Member] |  |  |  |  |  |  |
Reportable Segment (Textual) [Abstract] |  |  |  |  |  |  |
SEC Schedule III, Real Estate, Improvements | $ 12,500 | $ 7,300 | $ 20,300 | $ 11,200 |  |  |
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 | 48,175 | 44,544 | 95,082 |  | 87,916 |  |
Reportable apartment home segment NOI | (36,447) | (32,487) | (71,094) |  | (63,958) |  |
Reportable apartment home segment assets: |  |  |  |  |  |  |
Total segment assets | 1,670,364 |  | 1,670,364 |  |  | 1,658,042 |
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 | 17,613 | 17,364 | 34,862 |  | 34,610 |  |
Reportable apartment home segment NOI | (11,894) | (11,900) | (23,360) |  | (23,466) |  |
Reportable apartment home segment assets: |  |  |  |  |  |  |
Total segment assets | 716,152 |  | 716,152 |  |  | 713,093 |
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 | 6,868 | 6,653 | 13,605 |  | 13,206 |  |
Reportable apartment home segment NOI | (4,361) | (4,168) | (8,574) |  | (8,386) |  |
Reportable apartment home segment assets: |  |  |  |  |  |  |
Total segment assets | 780,235 |  | 780,235 |  |  | 777,376 |
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 | 11,870 | 11,254 | 23,549 |  | 22,385 |  |
Reportable apartment home segment NOI | (7,938) | (7,503) | (15,648) |  | (14,959) |  |
Reportable apartment home segment assets: |  |  |  |  |  |  |
Total segment assets | 335,662 |  | 335,662 |  |  | 333,428 |
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 | 15,497 | 14,658 | 30,570 |  | 28,925 |  |
Reportable apartment home segment NOI | (12,074) | (11,415) | (23,647) |  | (22,053) |  |
Reportable apartment home segment assets: |  |  |  |  |  |  |
Total segment assets | 230,330 |  | 230,330 |  |  | 228,996 |
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 | 13,135 | 10,369 | 25,585 |  | 20,170 |  |
Reportable apartment home segment NOI | (9,569) | (7,495) | (18,075) |  | (14,563) |  |
Reportable apartment home segment assets: |  |  |  |  |  |  |
Total segment assets | 506,252 |  | 506,252 |  |  | $ 527,835 |
Reportable Segment (Textual) [Abstract] |  |  |  |  |  |  |
SEC Schedule III, Real Estate, Improvements | 668 | 326 | 1,167 | $ 615 |  |  |
United Dominion Reality L.P. [Member] | Total Communities [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 | 113,158 | 104,842 | 223,253 |  | 207,212 |  |
Segment Reconciling Items [Member] | United Dominion Reality L.P. [Member] |  |  |  |  |  |  |
Reconciling items: |  |  |  |  |  |  |
Real estate depreciation and amortization | $ 44,100 | $ 44,697 | $ 88,578 |  | $ 88,968 |  |

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