Consolidated Statement Of Equity - 9 months ended Sep. 30, 2018 - USD ($)	Total	Limited Partners' Interest In Operating Partnership [Member]	Preferred Stock [Member]	Preferred Stock [Member] Series B [Member]	Common Stock [Member]	Treasury Stock, At Cost [Member]	Additional Paid-In Capital [Member]	Additional Paid-In Capital [Member] Series B [Member]	Cumulative Distributions In Excess Of Net Income [Member]	Cumulative Distributions In Excess Of Net Income [Member] Series B [Member]	Accumulated Other Comprehensive Income [Member]	Cedar Realty Trust, Inc. [Member]	Cedar Realty Trust, Inc. [Member] Series B [Member]	Minority Interests In Consolidated Joint Ventures [Member]	Noncontrolling Interests [Member]
Balance at Dec. 31, 2017	$ 630,111,000	$ 2,384,000	$ 207,508,000		$ 5,479,000	$ (18,463,000)	$ 875,062,000		$ (446,944,000)		$ 5,694,000	$ 628,336,000		$ (609,000)	$ 1,775,000
Balance, shares at Dec. 31, 2017			8,450,000		91,317,000
Net (loss) income	(378,000)	(41,000)							(731,000)			(731,000)		394,000	353,000
Unrealized gain on change in fair value of cash flow hedges	9,956,000	58,000									9,898,000	9,898,000			58,000
Share-based compensation, net	2,286,000				$ (6,000)	1,813,000	479,000					2,286,000
Share-based compensation, net, shares					(108,000)
Redemptions of Series B Shares	(50,016,000)			$ (47,967,000)				$ 1,458,000		$ (3,507,000)			$ (50,016,000)
Redemptions of Series B Shares, Shares				(2,000,000)
Common stock sales, net of issuance expenses	5,000						5,000					5,000
Common stock sales, net of issuance expenses, shares					2,000
Preferred stock dividends	(8,175,000)								(8,175,000)			(8,175,000)
Distributions to common shareholders/noncontrolling interests	(13,803,000)	(62,000)							(13,741,000)			(13,741,000)			(62,000)
Redemption of OP Units	(7,000)	(7,000)													(7,000)
Issuance of OP Units	975,000	975,000													975,000
Reallocation adjustment of limited partners' interest		139,000					(139,000)					(139,000)			139,000
Balance at Sep. 30, 2018	$ 570,954,000	$ 3,446,000	$ 159,541,000		$ 5,473,000	$ (16,650,000)	$ 876,865,000		$ (473,098,000)		$ 15,592,000	$ 567,723,000		$ (215,000)	$ 3,231,000
Balance, shares at Sep. 30, 2018			6,450,000		91,211,000