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Combined Guarantor Subsidiaries - Contingencies - Narrative (Details) | 9 Months Ended
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Sep. 30, 2019 USD ($)
Condensed Financial Statements, Captions [Line Items] |
Environmental liability insurance, maximum coverage per incident (up to) | $ 10,000,000
Environmental liability insurance, annual coverage limit (up to) | 50,000,000
Guarantor Subsidiaries |
Condensed Financial Statements, Captions [Line Items] |
Environmental liability insurance, maximum coverage per incident (up to) | 10,000,000
Environmental liability insurance, annual coverage limit (up to) | $ 50,000,000

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- Definition Annual coverage limit provided by the insurance arrangement for environmental liability claims. + References No definition available. + Details
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Namespace Prefix: | cbl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Environmental Liability Insurance, Maximum Coverage Per Incident + References No definition available. + Details
Name: | cbl_EnvironmentalLiabilityInsuranceMaximumCoveragePerIncident
Namespace Prefix: | cbl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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: | srt_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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