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MORTGAGE AND OTHER INDEBTEDNESS, NET - Covenants and Restrictions (Details) | 12 Months Ended
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Dec. 31, 2019 USD ($)
Non-recourse loans on operating properties |
Debt Instrument [Line Items] |
Debt default threshold, minimum loan amount (greater than) | $ 50,000,000

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- Definition Debt Instrument, Debt Default Threshold, Minimum Loan Amount + References No definition available. + Details
Name: | cbl_DebtInstrumentDebtDefaultThresholdMinimumLoanAmount
Namespace Prefix: | cbl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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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
Name: | us-gaap_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_LongtermDebtTypeAxis=cbl_NonRecourseLoansonOperatingPropertiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |