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Document and Entity Information - shares
 6 Months Ended
Jun. 30, 2019
Jul. 31, 2019
Document And Entity Information [Abstract]    
Document type 10-Q  
Amendment Flag false  
Document Period End Date Jun. 30, 2019  
Document Fiscal Period Focus Q2  
Document Fiscal Year Focus 2019  
Trading Symbol CDR  
Entity Registrant Name CEDAR REALTY TRUST, INC.  
Entity Central Index Key 0000761648  
Entity Current Reporting Status Yes  
Current Fiscal Year End Date --12-31  
Entity Filer Category Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   89,022,042
Entity File Number 001-31817  
Entity Tax Identification Number 421241468  
Entity Address, Address Line One 44 South Bayles Avenue  
Entity Address, City or Town Port Washington  
Entity Address, State or Province New York  
Entity Address, Postal Zip Code 11050-3765  
City Area Code 516  
Local Phone Number 767-6492