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JOINT VENTURES AND PARTNERSHIPS - Summary (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($) community property home	Mar. 31, 2019 USD ($)	Feb. 29, 2020 USD ($) home	Jan. 31, 2020 home	Dec. 31, 2019 USD ($)
Unconsolidated entities
Investment in unconsolidated entities	$ 585,091				$ 585,490
Number of real estate properties \| community	150
Financial information relating to unconsolidated joint ventures operations
Operating income/(loss)	$ 3,367	$ 49
Unconsolidated Joint Ventures
Combined summary of balance sheets relating to unconsolidated joint ventures
Total real estate, net	1,868,502				1,901,081
Cash and cash equivalents	32,486				29,823
Other assets	180,893				172,941
Total assets	2,081,881				2,103,845
Third party debt, net	1,136,306				1,148,048
Accounts payable and accrued liabilities	50,262				55,114
Total liabilities	1,186,568				1,203,162
Total equity	895,313				$ 900,683
Financial information relating to unconsolidated joint ventures operations
Total revenues	41,314	81,532
Property operating expenses	15,297	30,312
Real estate depreciation and amortization	16,243	29,580
Operating income/(loss)	9,774	21,640
Interest expense	(10,347)	(21,924)
Net unrealized gain/(loss) on held investments		1,522
Other income/(loss)	(8)	103
Net income /(loss)	(581)	1,341
Preferred Equity Investment Hillsboro Oregon
Unconsolidated entities
Number of apartment homes \| home				276
UDR's Ownership Interest				100.00%	49.00%
Preferred Equity Investment Thousand Oaks
Unconsolidated entities
Number of apartment homes \| home			142
UDR commitment			$ 20,100
Rate			9.00%
Operating Community
Unconsolidated entities
Investment in unconsolidated entities	308,274				$ 313,053
Income from investments	$ (2,433)	(3,887)
Operating Community \| Unconsolidated Joint Venture UDR Met Life I Partnership
Unconsolidated entities
Number of apartment homes \| home	150
Investment in unconsolidated entities	$ 28,570				$ 28,812
UDR's Ownership Interest	50.00%				50.00%
Number of real estate properties \| property	1
Income from investments	$ (454)	(576)
Operating Community \| Unconsolidated Joint Venture UDR MetLife II Partnership
Unconsolidated entities
Number of apartment homes \| home	1,250
Investment in unconsolidated entities	$ 150,652				$ 150,893
UDR's Ownership Interest	50.00%				50.00%
Number of real estate properties \| property	7
Income from investments	$ (91)	434
Operating Community \| Unconsolidated Joint Venture Other MetLife
Unconsolidated entities
Number of apartment homes \| home	1,437
Investment in unconsolidated entities	$ 94,109				$ 98,441
UDR's Ownership Interest	50.60%				50.60%
Number of real estate properties \| property	5
Income from investments	$ (1,811)	(1,777)
Operating Community \| Unconsolidated Joint Venture West Coast Development JV
Unconsolidated entities
Number of apartment homes \| home	293
Investment in unconsolidated entities	$ 34,943				$ 34,907
UDR's Ownership Interest	47.00%				47.00%
Number of real estate properties \| property	1
Income from investments	$ (77)	(149)
Operating Community \| Sold Joint Ventures
Unconsolidated entities
Income from investments		(1,819)
Development Community
Unconsolidated entities
Investment in unconsolidated entities	276,817				$ 272,437
Income from investments	$ 5,800	3,936
Development Community \| Preferred Equity Investment Hillsboro Oregon
Unconsolidated entities
Investment in unconsolidated entities					17,064
Rate	6.50%
Income from investments	$ (46)	(161)
Development Community \| Preferred Equity Investment 1532 Harrison San Francisco, CA
Unconsolidated entities
Investment in unconsolidated entities	31,426				30,585
UDR commitment	$ 24,645
Rate	11.00%
Years to Maturity	2 years 3 months 18 days
Income from investments	$ 836	748
Participating Loan Years to Maturity	2 years 3 months 18 days
Development Community \| Preferred Equity Investment 1200 Broadway Nashville TN
Unconsolidated entities
Investment in unconsolidated entities	$ 65,254				63,958
UDR commitment	$ 55,558
Rate	8.00%
Years to Maturity	2 years 6 months
Income from investments	$ 1,281	1,169
Participating Loan Years to Maturity	2 years 6 months
Development Community \| Preferred Equity Investment 1641 Lincoln Santa Monica CA
Unconsolidated entities
Investment in unconsolidated entities	$ 10,693				10,379
UDR commitment	$ 8,800
Rate	12.00%
Years to Maturity	2 years 3 months 18 days
Income from investments	$ 314	275
Participating Loan Years to Maturity	2 years 3 months 18 days
Development Community \| Preferred Equity Investment 1300 Fairmount Philadelphia, PA
Unconsolidated entities
Investment in unconsolidated entities	$ 55,840				51,215
UDR commitment	$ 51,393
Years to Maturity	3 years 4 months 24 days
Income from investments	$ 1,166	275
Participating Loan Years to Maturity	3 years 4 months 24 days
Development Community \| Preferred Equity Investment Essex Orlando, FL
Unconsolidated entities
Investment in unconsolidated entities	$ 15,270				14,804
UDR commitment	$ 12,886
Rate	12.50%
Years to Maturity	3 years 4 months 24 days
Income from investments	$ 466	332
Participating Loan Years to Maturity	3 years 4 months 24 days
Development Community \| Preferred Equity Investment Modera Lake Merritt, Oakland
Unconsolidated entities
Investment in unconsolidated entities	$ 28,653				22,653
UDR commitment	$ 27,250
Rate	9.00%
Years to Maturity	4 years
Income from investments	$ 574
Participating Loan Years to Maturity	4 years
Development Community \| Preferred Equity Investment Thousand Oaks, CA
Unconsolidated entities
Investment in unconsolidated entities	$ 5,994
UDR commitment	$ 20,059
Rate	9.00%
Years to Maturity	4 years 10 months 24 days
Income from investments	$ 24
Participating Loan Years to Maturity	4 years 10 months 24 days
Development Community \| Other Investment The Portals Washington, DC
Unconsolidated entities
Investment in unconsolidated entities	$ 49,323				48,181
UDR commitment	$ 38,559
Rate	11.00%
Years to Maturity	1 year 2 months 12 days
Income from investments	$ 1,335	1,173
Participating Loan Years to Maturity	1 year 2 months 12 days
Development Community \| Other Investment Ventures
Unconsolidated entities
Investment in unconsolidated entities	$ 14,364				$ 13,598
UDR commitment	34,500
Income from investments	$ (150)	$ 125