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UNCONSOLIDATED AFFILIATES - Joint Ventures (Details)	1 Months Ended										6 Months Ended	9 Months Ended	12 Months Ended
	Feb. 29, 2020 USD ($)	Nov. 30, 2019 USD ($)	Oct. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Aug. 31, 2019 USD ($)	May 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($) yr	May 31, 2018 USD ($)	Apr. 30, 2018 USD ($)	Jun. 30, 2020	Sep. 30, 2018 USD ($) yr	Dec. 31, 2020 USD ($) loan	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Jul. 31, 2019 USD ($)	Nov. 30, 2018	Sep. 29, 2018 USD ($)
Schedule Of Equity Method Investments [Line Items]
Gain on sales of real estate assets													$ 4,696,000	$ 16,274,000	$ 19,001,000
Loss on impairment													$ 213,358,000	$ 239,521,000	174,529,000
Number of loans in default | loan													14
Loans in default, aggregate outstanding balance													$ 833,444,000
Minimum
Schedule Of Equity Method Investments [Line Items]
Ownership interest in joint venture (as a percent)													20.00%
Maximum
Schedule Of Equity Method Investments [Line Items]
Ownership interest in joint venture (as a percent)													65.00%
G&I VIII CBL Triangle LLC
Schedule Of Equity Method Investments [Line Items]
Real estate investments								$ 0				$ 0
Loss on impairment								89,826,000				1,022,000
Fair value of real estate joint ventures								$ 33,600,000				$ 33,600,000						$ 123,453,000
Expected Term | G&I VIII CBL Triangle LLC
Schedule Of Equity Method Investments [Line Items]
Measurement input | yr								10				10
Cap Rate (as a percent) | G&I VIII CBL Triangle LLC
Schedule Of Equity Method Investments [Line Items]
Measurement input								0.15				0.15
Discount Rate (as a percent) | G&I VIII CBL Triangle LLC
Schedule Of Equity Method Investments [Line Items]
Measurement input								0.15				0.15
Atlanta Outlet JV, LLC
Schedule Of Equity Method Investments [Line Items]
Ownership interest in joint venture (as a percent)	50.00%													50.00%
Amount	$ 4,680,000
Debt instrument, maturity date	Nov. 30, 2023
Maximum guarantee (as a percent)	100.00%
Proportion of ownership in variable interest entity sold (as a percent)														25.00%
Proceeds from sale of land														$ 20,778,000
Related debt as part of proceeds from sale of land														11,440,000
Gain (loss) on investment/deconsolidation														56,067,000
Gain on sales of real estate assets														$ 12,939,000
Proportion of ownership in variable interest entity sold (as a percent)														25.00%
Gain (loss) related to marking investment to fair value														$ 43,128,000
Atlanta Outlet JV, LLC | LIBOR
Schedule Of Equity Method Investments [Line Items]
Basis spread on variable rate (as a percent)	2.50%
BI Development II, LLC
Schedule Of Equity Method Investments [Line Items]
Ownership in variable interest entity (as a percent)											20.00%
BI Development, LLC
Schedule Of Equity Method Investments [Line Items]
Ownership in variable interest entity (as a percent)													20.00%
Bullseye, LLC
Schedule Of Equity Method Investments [Line Items]
Ownership in variable interest entity (as a percent)													20.00%
El Paso Outlet Center Holding, LLC and El Paso Outlet Outparcels, LLC
Schedule Of Equity Method Investments [Line Items]
Ownership interest in joint venture (as a percent)					50.00%
Proportion of ownership in variable interest entity sold (as a percent)					25.00%
Proceeds from sale of land					$ 27,750,000
Related debt as part of proceeds from sale of land					18,525,000
Gain (loss) on investment/deconsolidation					11,174,000
Gain on sales of real estate assets					3,884,000
Gain (loss) related to marking investment to fair value					$ 7,290,000
G&I VIII CBL Triangle LLC
Schedule Of Equity Method Investments [Line Items]
Ownership interest in joint venture (as a percent)																90.00%
Real estate investments																$ 0
Hamilton Place Self Storage, LLC
Schedule Of Equity Method Investments [Line Items]
Ownership interest in joint venture (as a percent)				54.00%
Amount				$ 7,002,000
Maximum guarantee (as a percent)				100.00%
Gain on sales of real estate assets				$ 187,000
Maximum guarantee, backup guaranty (as a percent)				50.00%
Hamilton Place Self Storage, LLC | LIBOR
Schedule Of Equity Method Investments [Line Items]
Basis spread on variable rate (as a percent)				2.75%
Mall of South Carolina L.P.
Schedule Of Equity Method Investments [Line Items]
Amount		$ 7,959,000
Debt instrument, maturity date		Nov. 30, 2024
Debt Fixed Interest Rate		5.05%
Parkdale Self Storage, LLC
Schedule Of Equity Method Investments [Line Items]
Ownership interest in joint venture (as a percent)						50.00%
Amount						$ 6,500,000
Debt instrument, maturity date						Jul. 31, 2024
Maximum guarantee (as a percent)						100.00%
Gain on sales of real estate assets						$ 433,000
Interest rate percentage						5.25%
Parkdale Self Storage, LLC | LIBOR
Schedule Of Equity Method Investments [Line Items]
Basis spread on variable rate (as a percent)						2.80%
Vision-CBL Hamilton Place, LLC
Schedule Of Equity Method Investments [Line Items]
Ownership interest in joint venture (as a percent)																	50.00%
Amount			$ 16,800,000
Debt instrument, maturity date			Nov. 30, 2024
Gain on sales of real estate assets														$ 1,381,000
Vision-CBL Hamilton Place, LLC | LIBOR
Schedule Of Equity Method Investments [Line Items]
Basis spread on variable rate (as a percent)			2.45%
CBL/T-C, LLC
Schedule Of Equity Method Investments [Line Items]
Debt Fixed Interest Rate										4.84%
Proceeds from the loan were used to retire										$ 97,732,000
Debt Instrument, Interest Rate										6.98%
CBL/T-C, LLC | CoolSprings Galleria
Schedule Of Equity Method Investments [Line Items]
Ownership interest in joint venture (as a percent)										50.00%
Non-recourse loan secured										$ 155,000,000
Continental 425 Fund LLC | Total Shareholders' Equity
Schedule Of Equity Method Investments [Line Items]
Amount							$ 36,990,000								$ 36,990,000
Debt instrument, maturity date							Dec. 31, 2021
Capital contribution, land							$ 6,000,000
Cash contributed							$ 7,000
Membership units owned (as a percent)							43.50%
Continental 425 Fund LLC | LIBOR | Total Shareholders' Equity
Schedule Of Equity Method Investments [Line Items]
Basis spread on variable rate (as a percent)							2.35%
Pavilion at Port Orange | Total Shareholders' Equity
Schedule Of Equity Method Investments [Line Items]
Secured Loan									$ 56,738,000
Hammock Landing – Phase I | Total Shareholders' Equity
Schedule Of Equity Method Investments [Line Items]
Secured Loan									41,997,000
Hammock Landing – Phase II | Total Shareholders' Equity
Schedule Of Equity Method Investments [Line Items]
Secured Loan									$ 16,217,000
Port Orange Town Center LLC, West Melbourne Town Center LLC and West Melbourne Holdings II, LLC | Total Shareholders' Equity
Schedule Of Equity Method Investments [Line Items]
Maximum guarantee (as a percent)									50.00%
Port Orange Town Center LLC, West Melbourne Town Center LLC and West Melbourne Holdings II, LLC | LIBOR | Total Shareholders' Equity | Minimum
Schedule Of Equity Method Investments [Line Items]
Basis spread on variable rate (as a percent)									2.00%
Port Orange Town Center LLC, West Melbourne Town Center LLC and West Melbourne Holdings II, LLC | LIBOR | Total Shareholders' Equity | Maximum
Schedule Of Equity Method Investments [Line Items]
Basis spread on variable rate (as a percent)									2.25%
G&l Vlll CBL Triangle
Schedule Of Equity Method Investments [Line Items]
Amount										5,987,000
Gain (loss) on investment/deconsolidation										$ 387,000
Number of loans in default | loan													21
Loans in default, aggregate outstanding balance													$ 982,032,000
G&l Vlll CBL Triangle | LIBOR
Schedule Of Equity Method Investments [Line Items]
Basis spread on variable rate (as a percent)										2.75%

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