Consolidated Statement Of Equity - 3 months ended Mar. 31, 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	(16,620,000)	(87,000)							(16,668,000)			(16,668,000)		135,000	48,000
Unrealized gain on change in fair value of flow hedges	5,890,000	22,000									5,868,000	5,868,000			22,000
Share-based compensation, net	251,000				$ 24,000	5,000	222,000					251,000
Share-based compensation, net, shares					393,000
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	1,000						1,000					1,000
Preferred stock dividends	(2,799,000)								(2,799,000)			(2,799,000)
Distributions to common shareholders/noncontrolling interests	(4,612,000)	(17,000)							(4,595,000)			(4,595,000)			(17,000)
Reallocation adjustment of limited partners' interest		(184,000)					184,000					184,000			(184,000)
Balance at Mar. 31, 2018	$ 562,206,000	$ 2,118,000	$ 159,541,000		$ 5,503,000	$ (18,458,000)	$ 876,927,000		$ (474,513,000)		$ 11,562,000	$ 560,562,000		$ (474,000)	$ 1,644,000
Balance, shares at Mar. 31, 2018			6,450,000		91,710,000