Unconsolidated Affiliates and Noncontrolling Interests - Narrative (Details)	1 Months Ended	6 Months Ended
Feb. 29, 2020 USD ($)	Jun. 30, 2020 USD ($) entity
Schedule Of Equity Method Investments [Line Items]
Number of entities - equity method of accounting (entity) \| entity		29
Number of 50/50 joint ventures \| entity		17
Atlanta Outlet JV, LLC
Schedule Of Equity Method Investments [Line Items]
Ownership interest in joint venture (as a percent)	50.00%
Balance of non-recourse debt \| $	$ 4,680,000
Partnership guarantee (as a percent)	100.00%
Debt instrument, maturity date	Nov. 30, 2023
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%
CBL/T-C, LLC
Schedule Of Equity Method Investments [Line Items]
Balance of non-recourse debt \| $		$ 262,971,000
Debt instrument, maturity date		Oct. 31, 2025
Minimum
Schedule Of Equity Method Investments [Line Items]
Ownership interest in joint venture (as a percent)		20.00%
Ownership in variable interest entity (as a percent)		50.00%
Maximum
Schedule Of Equity Method Investments [Line Items]
Ownership interest in joint venture (as a percent)		65.00%
Ownership in variable interest entity (as a percent)		92.00%

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Face (par) amount of debt instrument at time of issuance.

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Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly).

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