Consolidated Statements of Comprehensive Income - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement Of Income And Comprehensive Income [Abstract]
Net (loss) income	$ (520,000)	$ 1,566,000	$ 4,358,000
Unrealized (loss) gain on change in fair value of cash flow hedges	(11,878,000)	(14,286,000)	1,518,000
Comprehensive (loss) income	(12,398,000)	(12,720,000)	5,876,000
Comprehensive (income) attributable to noncontrolling interests	(481,000)	(404,000)	(490,000)
Comprehensive (loss) income attributable to Cedar Realty Trust, Inc.	$ (12,879,000)	$ (13,124,000)	$ 5,386,000