CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) $ in Thousands	Preferred Stock	Common Stock	Paid-in Capital	Distributions in Excess of Net Income [Member]	Accumulated Other Comprehensive Income/(Loss) [Member]	Noncontrolling Interest	Total
Beginning Balance at Dec. 31, 2020	$ 44,765	$ 2,966	$ 5,881,383	$ (2,685,770)	$ (9,144)	$ 24,391	$ 3,258,591
Consolidated Statements of Changes in Equity
Net income/(loss) attributable to UDR, Inc.				14,824			14,824
Net income/(loss) attributable to noncontrolling interests						16	16
Redemption of noncontrolling interests in consolidated real estate						(125)	(125)
Long Term Incentive Plan Unit grants/(vestings), net						(3,379)	(3,379)
Other comprehensive income/(loss)					843		843
Issuance/(forfeiture) of common and restricted shares, net		1	1,510				1,511
Issuance of common shares through public offering, net			(393)				(393)
Adjustment for conversion of noncontrolling interest of unitholders in the Operating Partnership and DownREIT Partnership		1	5,338				5,339
Common stock distributions declared				(215,260)			(215,260)
Preferred stock distributions declared-Series E				(2,113)			(2,113)
Adjustment to reflect redemption value of redeemable noncontrolling interests				(254,681)			(254,681)
Ending Balance at Jun. 30, 2021	44,765	2,968	5,887,838	(3,143,000)	(8,301)	20,903	2,805,173
Beginning Balance at Mar. 31, 2021	44,765	2,968	5,885,682	(2,923,073)	(8,614)	14,673	3,016,401
Consolidated Statements of Changes in Equity
Net income/(loss) attributable to UDR, Inc.				11,720			11,720
Net income/(loss) attributable to noncontrolling interests						8	8
Long Term Incentive Plan Unit grants/(vestings), net						6,222	6,222
Other comprehensive income/(loss)					313		313
Issuance/(forfeiture) of common and restricted shares, net			1,707				1,707
Issuance of common shares through public offering, net			(393)				(393)
Adjustment for conversion of noncontrolling interest of unitholders in the Operating Partnership and DownREIT Partnership			842				842
Common stock distributions declared				(107,609)			(107,609)
Preferred stock distributions declared-Series E				(1,057)			(1,057)
Adjustment to reflect redemption value of redeemable noncontrolling interests				(122,981)			(122,981)
Ending Balance at Jun. 30, 2021	44,765	2,968	5,887,838	(3,143,000)	(8,301)	20,903	2,805,173
Beginning Balance at Dec. 31, 2021	44,765	3,181	6,884,269	(3,485,080)	(4,261)	31,430	3,474,304
Consolidated Statements of Changes in Equity
Net income/(loss) attributable to UDR, Inc.				18,789			18,789
Long Term Incentive Plan Unit grants/(vestings), net						(31,220)	(31,220)
Other comprehensive income/(loss)					8,606		8,606
Issuance/(forfeiture) of common and restricted shares, net		1	775				776
Issuance of common shares through public offering, net		65	350,203				350,268
Adjustment for conversion of noncontrolling interest of unitholders in the Operating Partnership and DownREIT Partnership		2	8,578				8,580
Common stock distributions declared				(244,531)			(244,531)
Preferred stock distributions declared-Series E				(2,201)			(2,201)
Adjustment to reflect redemption value of redeemable noncontrolling interests				286,263			286,263
Ending Balance at Jun. 30, 2022	44,765	3,249	7,243,825	(3,426,760)	4,345	210	3,869,634
Beginning Balance at Mar. 31, 2022	44,765	3,184	6,891,707	(3,549,788)	2,805	210	3,392,883
Consolidated Statements of Changes in Equity
Net income/(loss) attributable to UDR, Inc.				5,084			5,084
Other comprehensive income/(loss)					1,540		1,540
Issuance/(forfeiture) of common and restricted shares, net			1,816				1,816
Issuance of common shares through public offering, net		65	350,302				350,367
Common stock distributions declared				(123,463)			(123,463)
Preferred stock distributions declared-Series E				(1,109)			(1,109)
Adjustment to reflect redemption value of redeemable noncontrolling interests				242,516			242,516
Ending Balance at Jun. 30, 2022	$ 44,765	$ 3,249	$ 7,243,825	$ (3,426,760)	$ 4,345	$ 210	$ 3,869,634