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Combined Guarantor Subsidiaries - Related Party Transactions - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Condensed Financial Statements, Captions [Line Items]
Notes receivable with entities under common control	$ 4,662,000	$ 7,672,000
Other Notes Receivable
Condensed Financial Statements, Captions [Line Items]
Notes receivable with entities under common control	2,025,000	2,788,000
Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Notes receivable with entities under common control	75,016,000	76,747,000
Guarantor Subsidiaries \| Other Notes Receivable
Condensed Financial Statements, Captions [Line Items]
Notes receivable with entities under common control	75,016,000	76,747,000
Guarantor Subsidiaries \| CBL Management
Condensed Financial Statements, Captions [Line Items]
Management fee expense	5,884,000	6,022,000	$ 6,322,000
Amounts payable for management fees	394,000	176,000
Notes receivable with entities under common control	73,786,000	74,209,000
Guarantor Subsidiaries \| CBL Management \| Other Notes Receivable
Condensed Financial Statements, Captions [Line Items]
Interest Income, Related Party	$ 3,566,000	$ 6,853,000	$ 5,179,000
Guarantor Subsidiaries \| CBL Management \| Minimum
Condensed Financial Statements, Captions [Line Items]
Management fee (as a percent)	2.50%
Guarantor Subsidiaries \| CBL Management \| Maximum
Condensed Financial Statements, Captions [Line Items]
Management fee (as a percent)	3.50%