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REVENUES - Narrative (Details)	12 Months Ended
	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