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Combined Guarantor Subsidiaries - Leases - Narrative (Details) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019 USD ($) ground_lease	Jun. 30, 2019 USD ($) ground_lease
Lessee, Lease, Description [Line Items]
Tenant reimbursements period related to certain capital expenditure minimum		5 years
Tenant reimbursements period related to certain capital expenditure maximum		15 years
Number of ground leases	8	8
Guarantor Subsidiaries
Lessee, Lease, Description [Line Items]
Tenant reimbursements period related to certain capital expenditure minimum		5 years
Tenant reimbursements period related to certain capital expenditure maximum		15 years
Number of ground leases	1	1
Operating lease renewal term	5 years	5 years
Lease expense | $	$ 10	$ 20

X

- Definition

Tenant Reimbursements Period Related to Certain Capital Expenditure Maximum, in Years

+ References

No definition available.

+ Details

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Namespace Prefix:	cbl_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Tenant Reimbursements Period Related to Certain Capital Expenditure Minimum, in Years

+ References

No definition available.

+ Details

Name:	cbl_TenantReimbursementsPeriodRelatedToCertainCapitalExpenditureMinimumInYears
Namespace Prefix:	cbl_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

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

X

- Definition

Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Number of separate real estate development properties located on land subject to ground leases.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfPropertiesSubjectToGroundLeases
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Amount of operating lease expense. Excludes sublease income.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 4
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918638-209977

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

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Namespace Prefix:
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Period Type: