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REPORTABLE SEGMENTS (UNITED DOMINION REALTY, L.P.) (Details) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2019 USD ($) segment home | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Segments |  |  |  |  |  |  |  |  |  |  |  |
Same store communities | home |  |  |  |  |  |  |  |  | 37,959 |  |  |
Summary of rental income and NOI for UDRs reportable segments and reconciliation of NOI to loss from continuing operations |  |  |  |  |  |  |  |  |  |  |  |
Rental income | $ 302,745 | $ 289,008 | $ 278,463 | $ 267,922 | $ 264,732 | $ 263,256 | $ 256,634 | $ 250,483 | $ 1,138,138 | $ 1,035,105 | $ 984,309 |
Reconciling items: |  |  |  |  |  |  |  |  |  |  |  |
Property management |  |  |  |  |  |  |  |  | (32,721) | (28,465) | (27,068) |
Other operating expenses |  |  |  |  |  |  |  |  | (13,932) | (12,100) | (9,060) |
Real estate depreciation and amortization |  |  |  |  |  |  |  |  | (501,257) | (429,006) | (430,054) |
General and administrative |  |  |  |  |  |  |  |  | (51,533) | (46,983) | (48,566) |
Casualty-related (charges)/recoveries, net |  |  |  |  |  |  |  |  | (474) | (2,121) | (4,335) |
Gain/(loss) on sale of real estate owned |  |  |  |  |  |  |  |  | 5,282 | 136,197 | 43,404 |
Income/(loss) from unconsolidated entities |  |  |  |  |  |  |  |  | 137,873 | (5,055) | 31,257 |
Interest expense |  |  |  |  |  |  |  |  | (170,917) | (134,168) | (128,711) |
Net (income)/loss attributable to noncontrolling interests |  |  |  |  |  |  |  |  | (188) | (221) | (164) |
Net income/(loss) attributable to OP unitholders |  |  |  |  |  |  |  |  | 184,965 | 203,106 | 121,558 |
Reportable apartment home segment assets: |  |  |  |  |  |  |  |  |  |  |  |
Total segment assets | 12,602,101 |  |  |  | 10,196,159 |  |  |  | 12,602,101 | 10,196,159 |  |
Accumulated depreciation | (4,131,353) |  |  |  | (3,654,160) |  |  |  | (4,131,353) | (3,654,160) |  |
Total real estate owned, net of accumulated depreciation | 8,470,748 |  |  |  | 6,541,999 |  |  |  | 8,470,748 | 6,541,999 |  |
Total segment asset - net book value | 8,470,748 |  |  |  | 6,541,999 |  |  |  | 8,470,748 | 6,541,999 |  |
Reconciling items: |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | 8,106 |  |  |  | 185,216 |  |  |  | 8,106 | 185,216 | 2,038 | $ 2,112
Restricted cash | 25,185 |  |  |  | 23,675 |  |  |  | 25,185 | 23,675 | 19,792 | 19,994
Investment in unconsolidated entities | 588,262 |  |  |  | 780,869 |  |  |  | 588,262 | 780,869 |  |
Operating lease right-of-use assets | 204,225 |  |  |  |  |  |  |  | 204,225 |  |  |
Other assets | 186,296 |  |  |  | 137,710 |  |  |  | 186,296 | 137,710 |  |
Total assets | 9,636,472 |  |  |  | 7,711,728 |  |  |  | $ 9,636,472 | 7,711,728 |  |
Reportable Segments |  |  |  |  |  |  |  |  |  |  |  |
Number of reportable segments | segment |  |  |  |  |  |  |  |  | 2 |  |  |
Time to maintain percent occupancy to be considered a community |  |  |  |  |  |  |  |  | 3 months |  |  |
Practical expedient, single lease component |  |  |  |  |  |  |  |  | true |  |  |
Capital expenditures and development |  |  |  |  |  |  |  |  | $ 195,981 | 214,898 | 369,029 |
Same Store Communities West Region |  |  |  |  |  |  |  |  |  |  |  |
Summary of rental income and NOI for UDRs reportable segments and reconciliation of NOI to loss from continuing operations |  |  |  |  |  |  |  |  |  |  |  |
Lease revenue |  |  |  |  |  |  |  |  | 392,456 | 377,259 | 361,277 |
Other revenue |  |  |  |  |  |  |  |  | 31,045 | 28,493 | 27,493 |
Rental income |  |  |  |  |  |  |  |  | 423,501 | 405,752 | 388,770 |
Reportable apartment home segment NOI |  |  |  |  |  |  |  |  | 321,890 | 306,307 | 291,265 |
Reportable apartment home segment assets: |  |  |  |  |  |  |  |  |  |  |  |
Total segment assets | 3,810,672 |  |  |  | 3,763,366 |  |  |  | 3,810,672 | 3,763,366 |  |
Same Store Communities Mid-Atlantic Region |  |  |  |  |  |  |  |  |  |  |  |
Summary of rental income and NOI for UDRs reportable segments and reconciliation of NOI to loss from continuing operations |  |  |  |  |  |  |  |  |  |  |  |
Lease revenue |  |  |  |  |  |  |  |  | 210,391 | 204,733 | 199,206 |
Other revenue |  |  |  |  |  |  |  |  | 17,049 | 15,717 | 14,951 |
Rental income |  |  |  |  |  |  |  |  | 227,440 | 220,450 | 214,157 |
Reportable apartment home segment NOI |  |  |  |  |  |  |  |  | 159,665 | 153,670 | 150,126 |
Reportable apartment home segment assets: |  |  |  |  |  |  |  |  |  |  |  |
Total segment assets | 2,350,341 |  |  |  | 2,317,369 |  |  |  | 2,350,341 | 2,317,369 |  |
Same Store Communities Southeast Region |  |  |  |  |  |  |  |  |  |  |  |
Summary of rental income and NOI for UDRs reportable segments and reconciliation of NOI to loss from continuing operations |  |  |  |  |  |  |  |  |  |  |  |
Lease revenue |  |  |  |  |  |  |  |  | 113,175 | 109,189 | 104,106 |
Other revenue |  |  |  |  |  |  |  |  | 13,557 | 13,045 | 12,361 |
Rental income |  |  |  |  |  |  |  |  | 126,732 | 122,234 | 116,467 |
Reportable apartment home segment NOI |  |  |  |  |  |  |  |  | 88,467 | 85,220 | 80,726 |
Reportable apartment home segment assets: |  |  |  |  |  |  |  |  |  |  |  |
Total segment assets | 806,830 |  |  |  | 779,310 |  |  |  | 806,830 | 779,310 |  |
Same Store Communities Northeast Region |  |  |  |  |  |  |  |  |  |  |  |
Summary of rental income and NOI for UDRs reportable segments and reconciliation of NOI to loss from continuing operations |  |  |  |  |  |  |  |  |  |  |  |
Lease revenue |  |  |  |  |  |  |  |  | 119,910 | 117,572 | 115,713 |
Other revenue |  |  |  |  |  |  |  |  | 4,858 | 4,590 | 4,307 |
Rental income |  |  |  |  |  |  |  |  | 124,768 | 122,162 | 120,020 |
Reportable apartment home segment NOI |  |  |  |  |  |  |  |  | 83,832 | 84,059 | 83,569 |
Reportable apartment home segment assets: |  |  |  |  |  |  |  |  |  |  |  |
Total segment assets | 1,500,597 |  |  |  | 1,491,994 |  |  |  | 1,500,597 | 1,491,994 |  |
Non-Mature communities/Other |  |  |  |  |  |  |  |  |  |  |  |
Summary of rental income and NOI for UDRs reportable segments and reconciliation of NOI to loss from continuing operations |  |  |  |  |  |  |  |  |  |  |  |
Lease revenue |  |  |  |  |  |  |  |  | 162,969 | 94,176 | 77,524 |
Other revenue |  |  |  |  |  |  |  |  | 12,900 | 12,080 | 10,270 |
Rental income |  |  |  |  |  |  |  |  | 175,869 | 106,256 | 87,794 |
Reportable apartment home segment NOI |  |  |  |  |  |  |  |  | 117,860 | 68,353 | 58,378 |
Reportable apartment home segment assets: |  |  |  |  |  |  |  |  |  |  |  |
Total segment assets | 3,677,521 |  |  |  | 1,396,815 |  |  |  | 3,677,521 | 1,396,815 |  |
Total Communities |  |  |  |  |  |  |  |  |  |  |  |
Summary of rental income and NOI for UDRs reportable segments and reconciliation of NOI to loss from continuing operations |  |  |  |  |  |  |  |  |  |  |  |
Lease revenue |  |  |  |  |  |  |  |  | 1,053,417 | 955,899 | 909,775 |
Other revenue |  |  |  |  |  |  |  |  | 84,721 | 79,206 | 74,534 |
Rental income |  |  |  |  |  |  |  |  | 1,138,138 | 1,035,105 | 984,309 |
Reportable apartment home segment NOI |  |  |  |  |  |  |  |  | $ 808,303 | 732,115 | 698,503 |
United Dominion Realty L.P. |  |  |  |  |  |  |  |  |  |  |  |
Segments |  |  |  |  |  |  |  |  |  |  |  |
Same store communities | home |  |  |  |  |  |  |  |  | 15,723 |  |  |
Summary of rental income and NOI for UDRs reportable segments and reconciliation of NOI to loss from continuing operations |  |  |  |  |  |  |  |  |  |  |  |
Rental income | 111,389 | 111,700 | 110,350 | 108,334 | 108,523 | 109,539 | 107,266 | 106,592 | $ 441,773 | 431,920 | 419,377 |
Reconciling items: |  |  |  |  |  |  |  |  |  |  |  |
Property management |  |  |  |  |  |  |  |  | (12,701) | (11,878) | (11,533) |
Other operating expenses |  |  |  |  |  |  |  |  | (9,488) | (8,864) | (6,833) |
Real estate depreciation and amortization |  |  |  |  |  |  |  |  | (139,975) | (143,481) | (152,473) |
General and administrative |  |  |  |  |  |  |  |  | (18,014) | (16,889) | (17,875) |
Casualty-related (charges)/recoveries, net |  |  |  |  |  |  |  |  | (853) | (951) | (1,922) |
Gain/(loss) on sale of real estate owned |  |  |  |  |  |  |  |  |  | 75,507 | 41,272 |
Income/(loss) from unconsolidated entities |  |  |  |  |  |  |  |  | (8,313) | 43,496 | (19,256) |
Interest expense |  |  |  |  |  |  |  |  | (29,667) | (22,835) | (30,366) |
Net (income)/loss attributable to noncontrolling interests |  |  |  |  |  |  |  |  | (1,832) | (1,722) | (1,548) |
Net income/(loss) attributable to OP unitholders | 23,988 | $ 26,835 | $ 27,394 | $ 23,946 | 85,880 | $ 27,695 | $ 24,761 | $ 91,427 | 102,163 | 229,763 | 106,307 |
Reportable apartment home segment assets: |  |  |  |  |  |  |  |  |  |  |  |
Total segment assets | 3,875,160 |  |  |  | 3,811,985 |  |  |  | 3,875,160 | 3,811,985 |  |
Accumulated depreciation | (1,796,568) |  |  |  | (1,658,161) |  |  |  | (1,796,568) | (1,658,161) |  |
Total real estate owned, net of accumulated depreciation | 2,078,592 |  |  |  | 2,153,824 |  |  |  | 2,078,592 | 2,153,824 |  |
Total segment asset - net book value | 2,078,592 |  |  |  | 2,153,824 |  |  |  | 2,078,592 | 2,153,824 |  |
Reconciling items: |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | 24 |  |  |  | 125 |  |  |  | 24 | 125 | 293 | 756
Restricted cash | 13,998 |  |  |  | 13,563 |  |  |  | 13,998 | 13,563 | 12,579 | $ 11,694
Investment in unconsolidated entities | 76,222 |  |  |  | 103,026 |  |  |  | 76,222 | 103,026 |  |
Operating lease right-of-use assets | 205,668 |  |  |  |  |  |  |  | 205,668 |  |  |
Other assets | 24,241 |  |  |  | 34,052 |  |  |  | 24,241 | 34,052 |  |
Total assets | 2,398,745 |  |  |  | 2,304,590 |  |  |  | $ 2,398,745 | 2,304,590 |  |
Reportable Segments |  |  |  |  |  |  |  |  |  |  |  |
Number of reportable segments | segment |  |  |  |  |  |  |  |  | 2 |  |  |
Condition for Community considered to have stabilized occupancy |  |  |  |  |  |  |  |  | 90% |  |  |
Time to maintain percent occupancy to be considered a community |  |  |  |  |  |  |  |  | 3 months |  |  |
Practical expedient, single lease component |  |  |  |  |  |  |  |  | true |  |  |
Capital expenditures and development |  |  |  |  |  |  |  |  | $ 63,175 | 44,353 | 45,211 |
United Dominion Realty L.P. | Same Store Communities West Region |  |  |  |  |  |  |  |  |  |  |  |
Summary of rental income and NOI for UDRs reportable segments and reconciliation of NOI to loss from continuing operations |  |  |  |  |  |  |  |  |  |  |  |
Lease revenue |  |  |  |  |  |  |  |  | 248,474 | 238,886 | 228,027 |
Other revenue |  |  |  |  |  |  |  |  | 7,873 | 7,161 | 6,996 |
Rental income |  |  |  |  |  |  |  |  | 256,347 | 246,047 | 235,023 |
Reportable apartment home segment NOI |  |  |  |  |  |  |  |  | 196,302 | 187,664 | 177,228 |
Reportable apartment home segment assets: |  |  |  |  |  |  |  |  |  |  |  |
Total segment assets | 2,011,495 |  |  |  | 1,981,007 |  |  |  | 2,011,495 | 1,981,007 |  |
United Dominion Realty L.P. | Same Store Communities Mid-Atlantic Region |  |  |  |  |  |  |  |  |  |  |  |
Summary of rental income and NOI for UDRs reportable segments and reconciliation of NOI to loss from continuing operations |  |  |  |  |  |  |  |  |  |  |  |
Lease revenue |  |  |  |  |  |  |  |  | 59,530 | 58,624 | 57,275 |
Other revenue |  |  |  |  |  |  |  |  | 1,975 | 1,765 | 1,730 |
Rental income |  |  |  |  |  |  |  |  | 61,505 | 60,389 | 59,005 |
Reportable apartment home segment NOI |  |  |  |  |  |  |  |  | 42,413 | 41,642 | 40,292 |
Reportable apartment home segment assets: |  |  |  |  |  |  |  |  |  |  |  |
Total segment assets | 669,417 |  |  |  | 663,083 |  |  |  | 669,417 | 663,083 |  |
United Dominion Realty L.P. | Same Store Communities Southeast Region |  |  |  |  |  |  |  |  |  |  |  |
Summary of rental income and NOI for UDRs reportable segments and reconciliation of NOI to loss from continuing operations |  |  |  |  |  |  |  |  |  |  |  |
Lease revenue |  |  |  |  |  |  |  |  | 50,795 | 49,132 | 46,946 |
Other revenue |  |  |  |  |  |  |  |  | 2,925 | 2,764 | 2,640 |
Rental income |  |  |  |  |  |  |  |  | 53,720 | 51,896 | 49,586 |
Reportable apartment home segment NOI |  |  |  |  |  |  |  |  | 37,340 | 35,948 | 34,182 |
Reportable apartment home segment assets: |  |  |  |  |  |  |  |  |  |  |  |
Total segment assets | 352,790 |  |  |  | 340,722 |  |  |  | 352,790 | 340,722 |  |
United Dominion Realty L.P. | Same Store Communities Northeast Region |  |  |  |  |  |  |  |  |  |  |  |
Summary of rental income and NOI for UDRs reportable segments and reconciliation of NOI to loss from continuing operations |  |  |  |  |  |  |  |  |  |  |  |
Lease revenue |  |  |  |  |  |  |  |  | 32,224 | 31,693 | 31,387 |
Other revenue |  |  |  |  |  |  |  |  | 646 | 622 | 589 |
Rental income |  |  |  |  |  |  |  |  | 32,870 | 32,315 | 31,976 |
Reportable apartment home segment NOI |  |  |  |  |  |  |  |  | 24,103 | 24,578 | 24,510 |
Reportable apartment home segment assets: |  |  |  |  |  |  |  |  |  |  |  |
Total segment assets | 408,703 |  |  |  | 406,149 |  |  |  | 408,703 | 406,149 |  |
United Dominion Realty L.P. | Non-Mature communities/Other |  |  |  |  |  |  |  |  |  |  |  |
Summary of rental income and NOI for UDRs reportable segments and reconciliation of NOI to loss from continuing operations |  |  |  |  |  |  |  |  |  |  |  |
Lease revenue |  |  |  |  |  |  |  |  | 36,735 | 40,547 | 43,127 |
Other revenue |  |  |  |  |  |  |  |  | 596 | 726 | 660 |
Rental income |  |  |  |  |  |  |  |  | 37,331 | 41,273 | 43,787 |
Reportable apartment home segment NOI |  |  |  |  |  |  |  |  | 22,848 | 27,548 | 30,629 |
Reportable apartment home segment assets: |  |  |  |  |  |  |  |  |  |  |  |
Total segment assets | $ 432,755 |  |  |  | $ 421,024 |  |  |  | 432,755 | 421,024 |  |
United Dominion Realty L.P. | Total Communities |  |  |  |  |  |  |  |  |  |  |  |
Summary of rental income and NOI for UDRs reportable segments and reconciliation of NOI to loss from continuing operations |  |  |  |  |  |  |  |  |  |  |  |
Lease revenue |  |  |  |  |  |  |  |  | 427,758 | 418,882 | 406,762 |
Other revenue |  |  |  |  |  |  |  |  | 14,015 | 13,038 | 12,615 |
Rental income |  |  |  |  |  |  |  |  | 441,773 | 431,920 | 419,377 |
Reportable apartment home segment NOI |  |  |  |  |  |  |  |  | $ 323,006 | $ 317,380 | $ 306,841 |

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