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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Earnings Per Share (Details) - shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Common Stock      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Potentially dilutive securities excluded from the computation of EPS (shares) 0    
Antidilutive securities excluded from the computation of EPS (shares) 0    
CBL & Associates Limited Partnership      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Undistributed losses allocated to participating common units percent 100.00%    
CBL & Associates Limited Partnership | Common Units      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Potentially dilutive securities excluded from the computation of EPS (shares) 0 0  
Antidilutive securities excluded from the computation of EPS (shares) 0 0  
Performance Shares | CBL Associates Properties Inc      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Contingently issuable common shares/ units (shares)     102,820