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JOINT VENTURES AND PARTNERSHIPS - Summary (Details) | 1 Months Ended | 12 Months Ended |  |  |
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Jan. 31, 2020 USD ($) | Aug. 31, 2019 USD ($) | Jan. 31, 2019 USD ($) home | Dec. 31, 2019 USD ($) home property community | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Jul. 31, 2019 | Sep. 30, 2018 item | Aug. 31, 2018 USD ($) item
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Number of real estate properties | community |  |  |  | 148 |  |  |  |  |
Investment in unconsolidated entities |  |  |  |  | $ 585,490,000 |  |  |  |
Unconsolidated Joint Ventures |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Investment in unconsolidated entities |  |  |  | $ 313,053,000 | 556,694,000 |  |  |  |
Unconsolidated Joint Venture Three Washington DC |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Payment to acquire real estate |  | $ 184,000,000.0 |  |  |  |  |  |  |
UDR's Ownership Interest |  | 100.00% |  |  |  |  | 30.00% |  |
Preferred Equity Investment 1641 Lincoln Santa Monica CA |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Number of apartment homes |  |  |  |  |  |  |  |  | 66
Investment in unconsolidated entities |  |  |  | $ 10,379,000 | 9,211,000 |  |  |  |
Rate |  |  |  | 12.00% |  |  |  |  | 12.00%
Years to Maturity |  |  |  | 2 years 7 months 6 days |  |  |  |  |
UDR commitment |  |  |  | $ 8,800,000 |  |  |  |  |
Income from investments |  |  |  | 1,169,000 | 406,000 |  |  |  |
Preferred Equity Investment 1300 Fairmount Philadelphia, PA |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Number of apartment homes | item |  |  |  |  |  |  |  |  | 471
Investment in unconsolidated entities |  |  |  | $ 51,215,000 | 8,318,000 |  |  |  |
Years to Maturity |  |  |  | 3 years 7 months 6 days |  |  |  |  |
UDR commitment |  |  |  | $ 51,393,000 |  |  |  |  |
Income from investments |  |  |  | 3,098,000 | 159,000 |  |  |  |
Preferred Equity Investment Essex Orlando, FL |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Number of apartment homes | item |  |  |  |  |  |  |  | 330 |
Investment in unconsolidated entities |  |  |  | $ 14,804,000 | 9,940,000 |  |  |  |
Rate |  |  |  | 12.50% |  |  |  | 12.50% |
Years to Maturity |  |  |  | 3 years 8 months 12 days |  |  |  |  |
UDR commitment |  |  |  | $ 12,886,000 |  |  |  |  |
Income from investments |  |  |  | 1,639,000 | 258,000 |  |  |  |
Preferred Equity Investment Oakland, CA |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Investment in unconsolidated entities |  |  |  | $ 22,653,000 |  |  |  |  |
Rate |  |  |  | 9.00% |  |  |  |  |
Years to Maturity |  |  |  | 4 years 3 months 18 days |  |  |  |  |
UDR commitment |  |  |  | $ 27,250,000 |  |  |  |  |
Income from investments |  |  |  | 1,067,000 |  |  |  |  |
Other Investment Ventures |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Investment in unconsolidated entities |  |  |  | 13,598,000 | 4,154,000 |  |  |  |
UDR commitment |  |  |  | 18,000,000 |  |  |  |  |
Income from investments |  |  |  | $ 4,053,000 | $ (267,000) | $ (30,000) |  |  |
386 Home Operating Community In Anaheim |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Number of apartment homes | home |  |  | 386 |  |  |  |  |  |
Payment to acquire real estate |  |  | $ 33,500,000 |  |  |  |  |  |
UDR's Ownership Interest |  |  | 100.00% | 49.00% | 49.00% |  |  |  |
155 Home Operating Community in Seattle |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Number of apartment homes | home |  |  | 155 |  |  |  |  |  |
Payment to acquire real estate |  |  | $ 20,000,000.0 |  |  |  |  |  |
UDR's Ownership Interest |  |  | 100.00% | 49.00% | 49.00% |  |  |  |
Preferred Equity Investment Hillsboro Oregon |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
UDR's Ownership Interest |  |  |  | 49.00% |  |  |  |  |
Development Community |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Investment in unconsolidated entities |  |  |  | $ 272,437,000 | $ 224,175,000 |  |  |  |
Development Community | Unconsolidated Joint Venture UDR Met Life I Partnership |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Number of real estate properties | property |  |  |  | 1 |  |  |  |  |
Number of apartment homes | home |  |  |  | 150 |  |  |  |  |
Investment in unconsolidated entities |  |  |  | $ 28,812,000 | $ 30,839,000 |  |  |  |
UDR's Ownership Interest |  |  |  | 50.00% | 50.00% |  |  |  |
Development Community | Preferred Equity Investment West Coast Development JV |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Investment in unconsolidated entities |  |  |  | $ 17,064,000 | $ 65,417,000 |  |  |  |
Rate |  |  |  | 6.50% |  |  |  |  |
Income from investments |  |  |  | $ (447,000) | 865,000 | 23,230,000 |  |  |
Development Community | Preferred Equity Investment 1532 Harrison San Francisco, CA |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Investment in unconsolidated entities |  |  |  | $ 30,585,000 | 24,986,000 |  |  |  |
Rate |  |  |  | 11.00% |  |  |  |  |
Years to Maturity |  |  |  | 2 years 6 months |  |  |  |  |
UDR commitment |  |  |  | $ 24,645,000 |  |  |  |  |
Income from investments |  |  |  | 3,147,000 | 2,228,000 | 511,000 |  |  |
Development Community | Preferred Equity Investment 1200 Broadway Nashville TN |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Investment in unconsolidated entities |  |  |  | $ 63,958,000 | 58,982,000 |  |  |  |
Rate |  |  |  | 8.00% |  |  |  |  |
Years to Maturity |  |  |  | 2 years 9 months 18 days |  |  |  |  |
UDR commitment |  |  |  | $ 55,558,000 |  |  |  |  |
Income from investments |  |  |  | 4,888,000 | 2,970,000 | 370,000 |  |  |
Development Community | Other Investment The Portals Washington, DC |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Investment in unconsolidated entities |  |  |  | $ 48,181,000 | 43,167,000 |  |  |  |
Rate |  |  |  | 11.00% |  |  |  |  |
Years to Maturity |  |  |  | 1 year 4 months 24 days |  |  |  |  |
UDR commitment |  |  |  | $ 38,559,000 |  |  |  |  |
Income from investments |  |  |  | $ 5,012,000 | 3,692,000 | $ 839,000 |  |  |
Operating Community | Unconsolidated Joint Venture UDR MetLife II Partnership |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Number of real estate properties | property |  |  |  | 7 |  |  |  |  |
Number of apartment homes | home |  |  |  | 1,250 |  |  |  |  |
Investment in unconsolidated entities |  |  |  | $ 150,893,000 | $ 296,807,000 |  |  |  |
UDR's Ownership Interest |  |  |  | 50.00% | 50.00% |  |  |  |
Operating Community | Unconsolidated Joint Venture Other MetLife |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Number of real estate properties | property |  |  |  | 5 |  |  |  |  |
Number of apartment homes | home |  |  |  | 1,437 |  |  |  |  |
Investment in unconsolidated entities |  |  |  | $ 98,441,000 | $ 115,668,000 |  |  |  |
UDR's Ownership Interest |  |  |  | 50.60% | 50.60% |  |  |  |
Operating Community | Unconsolidated Joint Venture Vitruvian Park |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Investment in unconsolidated entities |  |  |  |  | $ 71,730,000 |  |  |  |
UDR's Ownership Interest |  |  |  |  | 50.00% |  |  |  |
Operating Community | Unconsolidated Joint Venture Three Washington DC |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Investment in unconsolidated entities |  |  |  |  | $ 5,507,000 |  |  |  |
UDR's Ownership Interest |  |  |  |  | 30.00% |  |  |  |
Operating Community | Unconsolidated Joint Venture West Coast Development JV |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Number of real estate properties | property |  |  |  | 1 |  |  |  |  |
Number of apartment homes | home |  |  |  | 293 |  |  |  |  |
Investment in unconsolidated entities |  |  |  | $ 34,907,000 | $ 36,143,000 |  |  |  |
UDR's Ownership Interest |  |  |  | 47.00% | 47.00% |  |  |  |
Subsequent Event | Preferred Equity Investment Hillsboro Oregon |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Payment to acquire real estate | $ 21,600,000 |  |  |  |  |  |  |  |
UDR's Ownership Interest | 100.00% |  |  |  |  |  |  |  |

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