CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) $ in Thousands	Preferred Stock	Common Stock	Paid-in Capital	Distributions in Excess of Net Income	Accumulated Other Comprehensive Income/(Loss), net	Noncontrolling Interests	Total
Beginning Balance at Dec. 31, 2018	$ 46,201	$ 2,755	$ 4,920,732	$ (2,063,996)	$ (67)	$ 17,152	$ 2,922,777
Consolidated Statements of Changes in Equity
Net income/(loss) attributable to UDR, Inc.				60,122			60,122
Net income/(loss) attributable to noncontrolling interests						57	57
Contribution of noncontrolling interests in consolidated real estate						125	125
Long Term Incentive Plan Unit grants/(vestings), net						1,277	1,277
Other comprehensive income/(loss)					(7,771)		(7,771)
Issuance/(forfeiture) of common and restricted shares, net			(298)				(298)
Issuance of common shares through public offering, net		49	212,823				212,872
Adjustment for conversion of noncontrolling interest of unitholders in the Operating Partnership and DownREIT Partnership		27	111,562				111,589
Common stock distributions declared				(193,523)			(193,523)
Preferred stock distributions declared-Series E				(2,042)			(2,042)
Adjustment to reflect redemption value of redeemable noncontrolling interests				(137,170)			(137,170)
Ending Balance at Jun. 30, 2019	46,201	2,831	5,244,819	(2,336,609)	(7,838)	18,611	2,968,015
Beginning Balance at Mar. 31, 2019	46,201	2,818	5,184,195	(2,281,262)	(2,970)	13,382	2,962,364
Consolidated Statements of Changes in Equity
Net income/(loss) attributable to UDR, Inc.				35,619			35,619
Net income/(loss) attributable to noncontrolling interests						27	27
Long Term Incentive Plan Unit grants/(vestings), net						5,202	5,202
Other comprehensive income/(loss)					(4,868)		(4,868)
Issuance/(forfeiture) of common and restricted shares, net			1,201				1,201
Issuance of common shares through public offering, net		5	20,688				20,693
Adjustment for conversion of noncontrolling interest of unitholders in the Operating Partnership and DownREIT Partnership		8	38,735				38,743
Common stock distributions declared				(96,962)			(96,962)
Preferred stock distributions declared-Series E				(1,031)			(1,031)
Adjustment to reflect redemption value of redeemable noncontrolling interests				7,027			7,027
Ending Balance at Jun. 30, 2019	46,201	2,831	5,244,819	(2,336,609)	(7,838)	18,611	2,968,015
Beginning Balance at Dec. 31, 2019	46,201	2,946	5,781,975	(2,462,132)	(10,448)	30,772	3,389,314
Consolidated Statements of Changes in Equity
Net income/(loss) attributable to UDR, Inc.				62,992			62,992
Net income/(loss) attributable to noncontrolling interests						9	9
Long Term Incentive Plan Unit grants/(vestings), net						(13,158)	(13,158)
Other comprehensive income/(loss)					(1,492)		(1,492)
Issuance/(forfeiture) of common and restricted shares, net		1	(229)				(228)
Conversion of Series E Cumulative Convertible Shares	(1,436)	1	1,435
Adjustment for conversion of noncontrolling interest of unitholders in the Operating Partnership and DownREIT Partnership		3	11,247				11,250
Common stock distributions declared				(212,422)			(212,422)
Preferred stock distributions declared-Series E				(2,128)			(2,128)
Adjustment to reflect redemption value of redeemable noncontrolling interests				182,990			182,990
Ending Balance at Jun. 30, 2020	44,765	2,951	5,794,428	(2,432,882)	(11,940)	17,623	3,414,945
Beginning Balance at Mar. 31, 2020	46,201	2,949	5,788,471	(2,360,636)	(12,870)	14,275	3,478,390
Consolidated Statements of Changes in Equity
Net income/(loss) attributable to UDR, Inc.				57,771			57,771
Net income/(loss) attributable to noncontrolling interests						19	19
Long Term Incentive Plan Unit grants/(vestings), net						3,329	3,329
Other comprehensive income/(loss)					930		930
Issuance/(forfeiture) of common and restricted shares, net			1,103				1,103
Conversion of Series E Cumulative Convertible Shares	(1,436)	1	1,435
Adjustment for conversion of noncontrolling interest of unitholders in the Operating Partnership and DownREIT Partnership		1	3,419				3,420
Common stock distributions declared				(106,232)			(106,232)
Preferred stock distributions declared-Series E				(1,062)			(1,062)
Adjustment to reflect redemption value of redeemable noncontrolling interests				(22,723)			(22,723)
Ending Balance at Jun. 30, 2020	$ 44,765	$ 2,951	$ 5,794,428	(2,432,882)	$ (11,940)	$ 17,623	3,414,945
Consolidated Statements of Changes in Equity
Cumulative effect upon adoption of ASC 326				$ (2,182)			$ (2,182)