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Combined Guarantor Subsidiaries - Related Party Transactions - Narrative (Details) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Condensed Financial Statements, Captions [Line Items]
Notes receivable with entities under common control	$ 2,928,000		$ 4,662,000
Other Notes Receivable
Condensed Financial Statements, Captions [Line Items]
Notes receivable with entities under common control	1,828,000		2,025,000
Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Notes receivable with entities under common control	73,786,000		75,016,000
Guarantor Subsidiaries \| Other Notes Receivable
Condensed Financial Statements, Captions [Line Items]
Notes receivable with entities under common control	73,786,000		75,016,000
Guarantor Subsidiaries \| CBL Management
Condensed Financial Statements, Captions [Line Items]
Management fee expense	1,368,000	$ 1,491,000
Amounts payable for management fees	76,000	394,000
Notes receivable with entities under common control	73,786,000		$ 73,786,000
Guarantor Subsidiaries \| CBL Management \| Other Notes Receivable
Condensed Financial Statements, Captions [Line Items]
Interest Income, Related Party	$ 1,014,000	$ 959,000
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%