CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME/(LOSS) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME/(LOSS)
Net income/(loss)	$ 105,237	$ 29,422	$ 38,318	$ 26,602	$ 89,615	$ 20,258	$ 22,444	$ 89,225	$ 199,579	$ 221,542	$ 132,655
Other comprehensive income/(loss), including portion attributable to noncontrolling interests:
Unrealized holding gain/(loss)									(8,437)	4,806	1,802
(Gain)/loss reclassified into earnings from other comprehensive income/(loss)									(2,770)	(1,948)	1,407
Other comprehensive income/(loss), including portion attributable to noncontrolling interests									(11,207)	2,858	3,209
Comprehensive income/(loss)									188,372	224,400	135,864
Comprehensive (income)/loss attributable to noncontrolling interests									(13,788)	(18,680)	(11,378)
Comprehensive income/(loss) attributable to UDR, Inc.									$ 174,584	$ 205,720	$ 124,486