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v3.21.1

REVENUES - Narrative (Details) | 12 Months Ended
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Dec. 31, 2020
Revenue From Contract With Customer [Abstract] |
Lease commission recognized upon lease execution (as a percent) | 50.00%

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- Definition Revenue, Performance Obligation, Lease Commission Recognized Upon Lease Execution, Percentage + References No definition available. + Details
Name: | cbl_RevenuePerformanceObligationLeaseCommissionRecognizedUponLeaseExecutionPercentage
Namespace Prefix: | cbl_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_RevenueFromContractWithCustomerAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration