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Mortgage and Other Indebtedness, Net - Unsecured Lines of Credit (Details) - USD ($)	9 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Total Outstanding	$ 970,508,000	$ 1,090,810,000
Wells Fargo Bank
Debt Instrument [Line Items]
Extension fee rate (as a percent)	0.15%
Wells Fargo Bank | Letter of Credit
Debt Instrument [Line Items]
Total Capacity	$ 30,000,000
First Tennessee Bank
Debt Instrument [Line Items]
Total Capacity	20,000,000
Wells Fargo - Facility A
Debt Instrument [Line Items]
Total Capacity	500,000,000
Total Outstanding	0
First Tennessee
Debt Instrument [Line Items]
Total Capacity	100,000,000
Total Outstanding	$ 47,695,000
First Tennessee | Wells Fargo Bank
Debt Instrument [Line Items]
Extension fee rate (as a percent)	0.20%
Wells Fargo - Facility B
Debt Instrument [Line Items]
Total Capacity	$ 500,000,000
Total Outstanding	153,663,000
Wells Fargo - Facility B | Letter of Credit
Debt Instrument [Line Items]
Total Capacity	4,833,000
Unsecured lines of credit
Debt Instrument [Line Items]
Total Capacity	1,100,000,000
Total Outstanding	$ 201,358,000

X

- Definition

The percentage fee charged for exercising the extension option on the line of credit.

+ References

No definition available.

+ Details

Name:	cbl_LineOfCreditOptionExerciseFeeChargedPercent
Namespace Prefix:	cbl_
Data Type:	num:percentItemType
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_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a rate subject to change from time to time.

+ References

No definition available.

+ Details

Name:	us-gaap_LongtermDebtPercentageBearingVariableInterestAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_LetterOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=cbl_FirstTennesseeBankMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=cbl_UnsecuredLineOfCredit1Member
Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=cbl_UnsecuredLineOfCredit2Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=cbl_UnsecuredLinesOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: