Consolidated Statement Of Equity - 6 months ended Jun. 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	(6,683,000)	(60,000)							(6,891,000)			(6,891,000)		268,000	208,000
Unrealized gain on change in fair value of flow hedges	7,827,000	29,000									7,798,000	7,798,000			29,000
Share-based compensation, net	1,213,000				$ (6,000)	1,734,000	(515,000)					1,213,000
Share-based compensation, net, shares					(103,000)
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					1,000
Preferred stock dividends	(5,487,000)								(5,487,000)			(5,487,000)
Distributions to common shareholders/noncontrolling interests	(9,214,000)	(34,000)							(9,180,000)			(9,180,000)			(34,000)
Reallocation adjustment of limited partners' interest		(169,000)					169,000					169,000			(169,000)
Balance at Jun. 30, 2018	$ 567,756,000	$ 2,150,000	$ 159,541,000		$ 5,473,000	$ (16,729,000)	$ 876,179,000		$ (472,009,000)		$ 13,492,000	$ 565,947,000		$ (341,000)	$ 1,809,000
Balance, shares at Jun. 30, 2018			6,450,000		91,215,000