Consolidated Statements of Comprehensive (Loss) Income - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement Of Income And Comprehensive Income [Abstract]
Net (loss) income	$ (80,883,000)	$ 1,404,000	$ (28,166,000)	$ (6,703,000)
Unrealized gain (loss) on change in fair value of cash flow hedges	1,595,000	1,480,000	6,811,000	(14,122,000)
Comprehensive (loss) income	(79,288,000)	2,884,000	(21,355,000)	(20,825,000)
Comprehensive loss (income) attributable to noncontrolling interests	358,000	(146,000)	(228,000)	(289,000)
Comprehensive (loss) income attributable to Cedar Realty Trust, Inc.	$ (78,930,000)	$ 2,738,000	$ (21,583,000)	$ (21,114,000)