Consolidated Statement of Equity - USD ($)	Total	Limited Partners' Interest In Operating Partnership [Member]	Preferred Stock [Member]	Common Stock [Member]	Treasury Stock, At Cost [Member]	Additional Paid-In Capital [Member]	Cumulative Distributions In Excess Of Net Income [Member]	Accumulated Other Comprehensive Income [Member]	Cedar Realty Trust, Inc. [Member]	Minority Interests In Consolidated Joint Ventures [Member]	Noncontrolling Interests [Member]
Balance at Dec. 31, 2019	$ 514,075,000	$ 3,079,000	$ 159,541,000	$ 809,000	$ (16,311,000)	$ 877,256,000	$ (503,725,000)	$ (7,009,000)	$ 510,561,000	$ 435,000	$ 3,514,000
Balance, shares at Dec. 31, 2019			6,450,000	13,488,000
Net income (loss)	(2,098,000)	(28,000)					(2,246,000)		(2,246,000)	176,000	148,000
Unrealized gain (loss) on change in fair value of cash flow hedges	(15,014,000)	(90,000)						(14,924,000)	(14,924,000)		(90,000)
Share-based compensation, net	866,000			$ 3,000	1,006,000	(143,000)			866,000
Share-based compensation, net, shares				46,000
Common stock sales, net of issuance expenses	5,000					5,000			5,000
Preferred stock dividends	(2,688,000)						(2,688,000)		(2,688,000)
Distributions to common shareholders/noncontrolling interests	(4,495,000)	(27,000)					(4,468,000)		(4,468,000)		(27,000)
Reallocation adjustment of limited partners' interest		(5,000)				5,000			5,000		(5,000)
Balance at Mar. 31, 2020	490,651,000	2,929,000	$ 159,541,000	$ 812,000	(15,305,000)	877,123,000	(513,127,000)	(21,933,000)	487,111,000	611,000	3,540,000
Balance, shares at Mar. 31, 2020			6,450,000	13,534,000
Balance at Dec. 31, 2019	514,075,000	3,079,000	$ 159,541,000	$ 809,000	(16,311,000)	877,256,000	(503,725,000)	(7,009,000)	510,561,000	435,000	3,514,000
Balance, shares at Dec. 31, 2019			6,450,000	13,488,000
Unrealized gain (loss) on change in fair value of cash flow hedges	(15,602,000)
Balance at Jun. 30, 2020	481,502,000	2,871,000	$ 159,541,000	$ 812,000	(15,248,000)	878,098,000	(522,805,000)	(22,518,000)	477,880,000	751,000	3,622,000
Balance, shares at Jun. 30, 2020			6,450,000	13,534,000
Balance at Mar. 31, 2020	490,651,000	2,929,000	$ 159,541,000	$ 812,000	(15,305,000)	877,123,000	(513,127,000)	(21,933,000)	487,111,000	611,000	3,540,000
Balance, shares at Mar. 31, 2020			6,450,000	13,534,000
Net income (loss)	(6,009,000)	(52,000)					(6,097,000)		(6,097,000)	140,000	88,000
Unrealized gain (loss) on change in fair value of cash flow hedges	(588,000)	(3,000)						(585,000)	(585,000)		(3,000)
Share-based compensation, net	1,030,000				57,000	973,000			1,030,000
Common stock sales, net of issuance expenses	4,000					4,000			4,000
Preferred stock dividends	(2,688,000)						(2,688,000)		(2,688,000)
Distributions to common shareholders/noncontrolling interests	(898,000)	(5,000)					(893,000)		(893,000)		(5,000)
Reallocation adjustment of limited partners' interest		2,000				(2,000)			(2,000)		2,000
Balance at Jun. 30, 2020	481,502,000	2,871,000	$ 159,541,000	$ 812,000	(15,248,000)	878,098,000	(522,805,000)	(22,518,000)	477,880,000	751,000	3,622,000
Balance, shares at Jun. 30, 2020			6,450,000	13,534,000
Balance at Dec. 31, 2020	487,458,000	2,907,000	$ 159,541,000	$ 812,000	(15,133,000)	879,790,000	(522,696,000)	(18,816,000)	483,498,000	1,053,000	3,960,000
Balance, shares at Dec. 31, 2020			6,450,000	13,530,000
Net income (loss)	1,253,000	(9,000)					1,112,000		1,112,000	150,000	141,000
Unrealized gain (loss) on change in fair value of cash flow hedges	4,197,000	26,000						4,171,000	4,171,000		26,000
Share-based compensation, net	781,000			$ 6,000	1,172,000	(397,000)			781,000
Share-based compensation, net, shares				99,000
Common stock sales, net of issuance expenses	1,000					1,000			1,000
Preferred stock dividends	(2,688,000)						(2,688,000)		(2,688,000)
Distributions to common shareholders/noncontrolling interests	(904,000)	(5,000)					(899,000)		(899,000)		(5,000)
Reallocation adjustment of limited partners' interest		(19,000)				19,000			19,000		(19,000)
Balance at Mar. 31, 2021	490,098,000	2,900,000	$ 159,541,000	$ 818,000	(13,961,000)	879,413,000	(525,171,000)	(14,645,000)	485,995,000	1,203,000	4,103,000
Balance, shares at Mar. 31, 2021			6,450,000	13,629,000
Balance at Dec. 31, 2020	487,458,000	2,907,000	$ 159,541,000	$ 812,000	(15,133,000)	879,790,000	(522,696,000)	(18,816,000)	483,498,000	1,053,000	3,960,000
Balance, shares at Dec. 31, 2020			6,450,000	13,530,000
Unrealized gain (loss) on change in fair value of cash flow hedges	5,216,000
Balance at Jun. 30, 2021	539,782,000	3,146,000	$ 159,541,000	$ 818,000	(13,911,000)	880,491,000	(477,992,000)	(13,636,000)	535,311,000	1,325,000	4,471,000
Balance, shares at Jun. 30, 2021			6,450,000	13,628,000
Balance at Mar. 31, 2021	490,098,000	2,900,000	$ 159,541,000	$ 818,000	(13,961,000)	879,413,000	(525,171,000)	(14,645,000)	485,995,000	1,203,000	4,103,000
Balance, shares at Mar. 31, 2021			6,450,000	13,629,000
Net income (loss)	51,464,000	287,000					51,055,000		51,055,000	122,000	409,000
Unrealized gain (loss) on change in fair value of cash flow hedges	1,019,000	10,000						1,009,000	1,009,000		10,000
Share-based compensation, net	1,089,000				50,000	1,039,000			1,089,000
Share-based compensation, net, shares				(1,000)
Common stock sales, net of issuance expenses	1,000					1,000			1,000
Preferred stock dividends	(2,688,000)						(2,688,000)		(2,688,000)
Distributions to common shareholders/noncontrolling interests	(1,193,000)	(5,000)					(1,188,000)		(1,188,000)		(5,000)
Redemption of OP units	(8,000)	(8,000)									(8,000)
Reallocation adjustment of limited partners' interest		(38,000)				38,000			38,000		(38,000)
Balance at Jun. 30, 2021	$ 539,782,000	$ 3,146,000	$ 159,541,000	$ 818,000	$ (13,911,000)	$ 880,491,000	$ (477,992,000)	$ (13,636,000)	$ 535,311,000	$ 1,325,000	$ 4,471,000
Balance, shares at Jun. 30, 2021			6,450,000	13,628,000