CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME/(LOSS) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME/(LOSS)
Net income/(loss)	$ 89,615	$ 20,258	$ 22,444	$ 89,225	$ 75,627	$ 17,570	$ 11,062	$ 28,396	$ 221,542	$ 132,655	$ 320,380
Other comprehensive income/(loss), including portion attributable to noncontrolling interests:
Unrealized holding gain/(loss)									4,806	1,802	3,514
(Gain)/loss reclassified into earnings from other comprehensive income/(loss)									(1,948)	1,407	3,657
Other comprehensive income/(loss), including portion attributable to noncontrolling interests									2,858	3,209	7,171
Comprehensive income/(loss)									224,400	135,864	327,551
Comprehensive (income)/loss attributable to noncontrolling interests									(18,680)	(11,378)	(27,764)
Comprehensive income/(loss) attributable to UDR, Inc.									$ 205,720	$ 124,486	$ 299,787