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Contingencies - Litigation (Details) | 9 Months Ended
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Sep. 30, 2021
Securities Class Action Litigation |
Loss Contingencies [Line Items] |
Notice of suggestion of bankruptcy filed date | Nov. 09, 2020
Derivative Litigation |
Loss Contingencies [Line Items] |
Notice of suggestion of bankruptcy filed date | Nov. 09, 2020

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- Definition Date petition for bankruptcy filed with the bankruptcy court, in YYYY-MM-DD format. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 55 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84165509&loc=d3e56145-112766 + Details
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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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_LitigationCaseAxis=cbl_DerivativeLitigationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |