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Combined Guarantor Subsidiaries - Subsequent Events - Narrative (Details)	1 Months Ended
	Feb. 29, 2020
Subsequent Event | Guarantor Subsidiaries
Subsequent Event [Line Items]
Maturity Date	2020-08

X

- Definition

Notes receivable maturity month and year.

+ References

No definition available.

+ Details

Name:	cbl_NotesReceivableMaturityMonthAndYear
Namespace Prefix:	cbl_
Data Type:	xbrli:gYearMonthItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ConsolidatedEntitiesAxis=srt_GuarantorSubsidiariesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: