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Combined Guarantor Subsidiaries - Dispositions - Narrative (Details)	12 Months Ended
	Dec. 31, 2019 USD ($) outparcel	Dec. 31, 2018 USD ($) outparcel	Dec. 31, 2017 USD ($) outparcel
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (loss) on sales of real estate assets	$ 16,274,000	$ 19,001,000	$ 93,792,000
Guarantor Subsidiaries
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (loss) on sales of real estate assets	22,000	$ 2,406,000	$ 38,247,000
Number of outparcels sold | outparcel		5	18
Guarantor Subsidiaries | CBL Management
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (loss) on sales of real estate assets	$ 28,894,000
Number of outparcels sold | outparcel	13

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Number of Outparcels Sold

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- Definition

The net gain (loss) resulting from sales and other disposals of other real estate owned, increases (decreases) in the valuation allowance for foreclosed real estate, and write-downs of other real estate owned after acquisition or physical possession.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.14(d))
-URI http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260

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