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REDEEMABLE INTERESTS AND NONCONTROLLING INTERESTS - Other Consolidated Subsidiaries and Variable Interest Entities (Details) $ in Thousands | Dec. 31, 2020 USD ($) subsidiary | Dec. 31, 2019 USD ($) subsidiary
--- | --- | ---
Redeemable Noncontrolling Interest [Line Items] |  |
Number of other consolidated subsidiaries | subsidiary | 12 | 12
Other Consolidated Subsidiaries |  |
Redeemable Noncontrolling Interest [Line Items] |  |
Other non controlling interests | $ | $ 3,058 | $ 23,961

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- Definition Number of Other Consolidated Subsidiaries + References No definition available. + Details
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Namespace Prefix: | cbl_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Carrying amount of equity interests owned by noncontrolling shareholders, partners, or other equity holders in one or more of the entities consolidated into the reporting entity's financial statements other than joint ventures, limited partnerships, operating partnerships or interests held by preferred unit holders. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | dei_LegalEntityAxis=cbl_OtherConsolidatedSubsidiariesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |