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Organization and Basis of Presentation - Narrative (Details)
$ in Thousands, shares in Millions
 9 Months Ended
Sep. 30, 2018
USD ($)
state
subsidiary
shares
Sep. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]        
Number of states in which entity operates | state 26      
Net cash provided by (used in) investing activities $ 14,325 $ 35,412    
Net cash provided by (used in) financing activities (278,109) (298,049)    
Principal payments on mortgage and other indebtedness 649,904 1,159,144    
Cash, cash equivalents, restricted cash, and restricted cash equivalents $ 56,145 68,558 $ 68,172 $ 65,069
CBL & Associates Limited Partnership        
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]        
Number of subsidiaries owned by the company | subsidiary 2      
Ownership of the sole general partner in partnership (as a percent) 1.00%      
Limited partnership interest owned by CBL Holdings II, Inc. in the operating partnership (as a percent) 85.60%      
Combined ownership by the subsidiaries in operating partnership (as a percent) 86.60%      
Consolidated Properties        
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]        
Non-controlling limited partner interest ownership of CBL's Predecessor in the Operating Partnership (as a percent) 9.10%      
Non-controlling limited partner interest of third parties in Operating partnership (as a percent) 4.30%      
Common stock owned by CBL's Predecessor (shares) | shares 4.0      
Total combined effective interest of CBL's Predecessor in Operating Partnership (as a percent) 11.10%      
Accounting Standards Update 2016-18        
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]        
Net cash provided by (used in) investing activities   1,261    
Net cash provided by (used in) financing activities   (1,261)    
Principal payments on mortgage and other indebtedness   7,650    
Cash, cash equivalents, restricted cash, and restricted cash equivalents   $ (8,911)    
CBL Holdings | Consolidated Properties        
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]        
Ownership interest in qualified subsidiaries (as a percent) 100.00%