Consolidated Statements of Changes in Equity (Unaudited) (USD $)	Total	Preferred Stock [Member]	Common Stock [Member]	Paid - in Capital	Distributions in Excess of Net Income	Accumulated Other Comprehensive Income/(Loss)	Noncontrolling Interest [Member]
Beginning Balance at Dec. 31, 2014	$ 2,735,950,000	$ 46,571,000	$ 2,551,000	$ 4,223,747,000	$ (1,528,917,000)	$ (8,855,000)	$ 853,000
Beginning Balance, Shares at Dec. 31, 2014		2,803,812	255,114,603
Stock Redeemed or Called During Period, Value		0			0
Stock Issued During Period, Shares, New Issues			3,439,636
Stock Issued During Period, Shares, Conversion of Units			534
Consolidted Statements of Changes in Equity
Net income/(loss) attributable to UDR, Inc.	73,822,000
Net income/(loss) attributable to noncontrolling interests	7,000						7,000
Other comprehensive income/(loss)	(6,590,000)					(6,590,000)
Issuance/(forfeiture) of common and restricted shares, net Shares			(433,966)
Issuance/(forfeitures) of common and restricted shares, net	1,903,000		4,000	1,899,000
Issuance of common shares through public offering	108,790,000		34,000	108,756,000
Adjustment for conversion of noncontrolling interest of unitholders in Operating Partnership	17,000		(1,000)	(16,000)
Common stock distributions declared ($0.2775 per share)	72,231,000				72,231,000
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests							0
Preferred stock distributions declared-Series E ($0.3322 per share)	931,000				931,000
Adjustment to reflect redemption value of redeemable noncontrolling interests	(29,696,000)				(29,696,000)
Stock Redeemed or Called During Period, Shares		0
Ending Balance at Mar. 31, 2015	$ 2,811,041,000	$ 46,571,000	$ 2,590,000	$ 4,334,418,000	$ (1,557,953,000)	$ (15,445,000)	$ 860,000
Ending Balance, Shares at Mar. 31, 2015		2,803,812	258,988,739