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JOINT VENTURES AND PARTNERSHIPS - Commitments (Details) $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
	Jan. 31, 2022 USD ($) home	Sep. 30, 2022 USD ($) home	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) home	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)
Joint Ventures
Investment in unconsolidated entities		$ 754,123		$ 754,123		$ 696,376
Gain/(loss) on sale of real estate owned		0	$ 0	0	$ 50,829
Deferred fees from the sale of properties		8,200		8,200		8,700
Joint venture management and other fees		$ 1,274	$ 1,071	$ 3,778	$ 4,918
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Limited Partner
Joint Ventures
Investment in unconsolidated entities	$ 7,500
UDR Commitment	$ 25,000
Operating Community
Joint Ventures
Investment in unconsolidated entities		$ 253,342		$ 253,342		270,915
Unconsolidated Joint Venture UDR Met Life I | Operating Community
Joint Ventures
Investment in unconsolidated entities		$ 21,532		$ 21,532		23,880
Number of apartment homes | home		150		150
Unconsolidated Joint Venture UDR MetLife II | Operating Community
Joint Ventures
Investment in unconsolidated entities		$ 176,191		$ 176,191		181,023
Number of apartment homes | home		1,250		1,250
Preferred Equity Investment Herndon, Virginia | Development Community
Joint Ventures
Investment in unconsolidated entities		$ 33,299		$ 33,299		22,828
UDR Commitment		$ 30,208		$ 30,208
Preferred return (as a percent)		9.00%		9.00%
Preferred Equity Investment Allen, Texas | Development Community
Joint Ventures
Investment in unconsolidated entities		$ 22,009		$ 22,009		14,134
UDR Commitment		$ 19,843		$ 19,843
Preferred return (as a percent)		9.00%		9.00%
Preferred Equity Investment 1200 Broadway Nashville TN | Development Community
Joint Ventures
Investment in unconsolidated entities						61,326
Real estate technology investments RETV I | Development Community
Joint Ventures
Investment in unconsolidated entities		$ 25,639		$ 25,639		71,464
UDR Commitment		18,000		18,000
Accounts Payable, Accrued Expenses and Other Liabilities | 13th and Market Properties LLC
Joint Ventures
Investment in unconsolidated entities		$ (7,000)		$ (7,000)		$ (6,100)
Preferred Equity Investment Home Operating Community, Nashville Tennessee | Operating Community
Joint Ventures
Number of communities sold | home	313
Equity method investment amount sold	$ 294,000
Variable participation on the sale of community	$ 10,600

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