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Mortgage and Other Indebtedness (Details) | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2015 | Sep. 30, 2015 USD ($) loan derivative_instrument credit_line | Dec. 31, 2014 USD ($) loan derivative_instrument | Oct. 31, 2014 | Dec. 31, 2013 USD ($) | Nov. 30, 2013
Debt Instrument [Line Items] |  |  |  |  |  |
Weighted Average Interest Rate (percent) |  | 4.47% | 4.93% |  |  |
Long-term debt |  | $ 4,820,316,000 |  |  |  |
Fixed Rate Interest |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Weighted Average Interest Rate (percent) |  | 5.53% | 5.50% |  |  |
Variable Rate Interest Member |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Weighted Average Interest Rate (percent) |  | 1.66% | 1.69% |  |  |
Wells Fargo Bank |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Line of credit, extension fee (percent) |  | 0.20% |  |  |  |
Senior Unsecured Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  | $ 450,000,000 |
Notice required to redeem debt, term |  | 30 days |  |  |  |
Debt instrument, redemption price, percentage |  | 100.00% |  |  |  |
Senior Unsecured Notes | Fixed Rate Interest |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Weighted Average Interest Rate (percent) |  |  |  |  | 5.25% | 5.25%
Senior Unsecured Notes | Fixed Rate Operating Loans |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Unamortized debt discount |  | $ 3,946,000 | $ 4,230,000 |  |  |
Senior Unsecured Notes | Minimum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Secured debt to total assets (as a percent) |  | 40.00% |  |  |  |
Senior Unsecured Notes | Minimum | Fixed Rate Interest |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, increase in variable interest rate |  | 0.25% |  |  |  |
Senior Unsecured Notes | Maximum | Fixed Rate Interest |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, increase in variable interest rate |  | 1.00% |  |  |  |
Non-recourse loans on operating properties |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, debt default threshold, minimum loan amount |  | $ 50,000,000 |  |  |  |
Non-recourse loans on operating properties | Fixed Rate Interest |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Weighted Average Interest Rate (percent) |  | 5.68% | 5.62% |  |  |
Non-recourse loans on operating properties | Variable Rate Interest Member |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Weighted Average Interest Rate (percent) |  | 2.32% | 2.29% |  |  |
5.250% Senior Notes Due 2023 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, redemption price, percentage |  | 100.00% |  |  |  |
5.250% Senior Notes Due 2023 | Fixed Rate Interest |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Weighted Average Interest Rate (percent) |  | 5.25% | 5.25% |  |  |
5.250% Senior Notes Due 2023 | Minimum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Secured debt to total assets (as a percent) |  | 40.00% |  |  |  |
5.250% Senior Notes Due 2023 | Maximum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Secured debt to total assets (as a percent) |  | 45.00% |  |  |  |
Senior Notes Due 2024 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, redemption price, percentage |  | 100.00% |  |  |  |
Senior Notes Due 2024 | Fixed Rate Interest |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Weighted Average Interest Rate (percent) |  | 4.60% | 4.60% | 4.60% |  |
Other | Fixed Rate Interest |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Weighted Average Interest Rate (percent) |  | 3.50% | 3.50% |  |  |
Recourse term loans on operating properties |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, debt default threshold, minimum loan amount |  | $ 150,000,000 |  |  |  |
Recourse term loans on operating properties | Variable Rate Interest Member |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Weighted Average Interest Rate (percent) |  | 2.92% | 2.91% |  |  |
Construction loans | Variable Rate Interest Member |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Weighted Average Interest Rate (percent) |  | 2.70% | 2.66% |  |  |
Unsecured lines of credit | Variable Rate Interest Member |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Weighted Average Interest Rate (percent) |  | 1.60% | 1.56% |  |  |
Unsecured term loans | Variable Rate Interest Member |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Weighted Average Interest Rate (percent) |  | 1.70% | 1.71% |  |  |
Unsecured lines of credit |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Number of unsecured term loans | loan |  | 2 |  |  |  |
Loan agreement, basis spread on variable rate (as a percentage) |  | 1.40% |  |  |  |
Unsecured lines of credit | Minimum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Loan agreement, basis spread on variable rate (as a percentage) |  | 1.00% |  |  |  |
Unsecured lines of credit | Maximum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Loan agreement, basis spread on variable rate (as a percentage) |  | 1.75% |  |  |  |
Annual facility Fee (percent) |  | 0.35% |  |  |  |
Wells Fargo Bank |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Letter of credit, outstanding |  | $ 800,000 |  |  |  |
Unsecured Term Loan 3 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Loan agreement, basis spread on variable rate (as a percentage) |  | 1.50% |  |  |  |
Unsecured Term Loan 2 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Loan agreement, basis spread on variable rate (as a percentage) | 1.55% |  | 1.90% |  |  |
Required | Senior Unsecured Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Secured debt to total assets (as a percent) |  | 45.00% |  |  |  |
Total debt to total asset value (as a percent) |  | 60.00% |  |  |  |
Total Unencumbered Assets to Unsecured Debt (as a percent) |  | 150.00% |  |  |  |
Consolidated income available for debt service to annual debt service charge (as a percent) |  | 150.00% |  |  |  |
Required | Unsecured Credit Facility and Term Loan |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total debt to total asset value (as a percent) |  | 60.00% |  |  |  |
Total Unencumbered Assets to Unsecured Debt (as a percent) |  | 160.00% |  |  |  |
Unencumbered NOI to unsecured interest expense (as a percent) |  | 175.00% |  |  |  |
EBITDA to fixed charges (debt service) (as a percent) |  | 150.00% |  |  |  |
Actual | Senior Unsecured Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Secured debt to total assets (as a percent) |  | 31.00% |  |  |  |
Total debt to total asset value (as a percent) |  | 54.00% |  |  |  |
Total Unencumbered Assets to Unsecured Debt (as a percent) |  | 213.00% |  |  |  |
Consolidated income available for debt service to annual debt service charge (as a percent) |  | 330.00% |  |  |  |
Actual | Unsecured Credit Facility and Term Loan |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total debt to total asset value (as a percent) |  | 50.00% |  |  |  |
Total Unencumbered Assets to Unsecured Debt (as a percent) |  | 230.00% |  |  |  |
Unencumbered NOI to unsecured interest expense (as a percent) |  | 450.00% |  |  |  |
EBITDA to fixed charges (debt service) (as a percent) |  | 220.00% |  |  |  |
Interest Rate Swap |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Number of unsecured term loans | loan |  |  | 4 |  |  |
Derivative, Number of Instruments Held | derivative_instrument |  | 4 | 4 |  |  |
Derivative, Notional Amount |  | $ 102,283,000 | $ 105,584,000 |  |  |
CBL & Associates Properties, Inc. |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt, percentage bearing fixed interest, amount |  | 3,502,337,000 | 4,004,064,000 |  |  |
Mortgage and other indebtedness amount carrying value |  | 1,319,138,000 | 696,396,000 |  |  |
Long-term debt |  | 4,821,475,000 | 4,700,460,000 |  |  |
CBL & Associates Properties, Inc. | Non-recourse loans on operating properties |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt, percentage bearing fixed interest, amount |  | 2,753,144,000 | 3,252,730,000 |  |  |
Mortgage and other indebtedness amount carrying value |  | 16,910,000 | 17,121,000 |  |  |
CBL & Associates Properties, Inc. | 5.250% Senior Notes Due 2023 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt, percentage bearing fixed interest, amount |  | 446,054,000 | 445,770,000 |  |  |
CBL & Associates Properties, Inc. | Senior Notes Due 2024 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt, percentage bearing fixed interest, amount |  | 299,931,000 | 299,925,000 |  |  |
CBL & Associates Properties, Inc. | Other |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt, percentage bearing fixed interest, amount |  | 3,208,000 | 5,639,000 |  |  |
CBL & Associates Properties, Inc. | Recourse term loans on operating properties |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Mortgage and other indebtedness amount carrying value |  | 11,588,000 | 7,638,000 |  |  |
CBL & Associates Properties, Inc. | Construction loans |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Mortgage and other indebtedness amount carrying value |  | 8,542,000 | 454,000 |  |  |
CBL & Associates Properties, Inc. | Unsecured lines of credit |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Mortgage and other indebtedness amount carrying value |  | 832,098,000 | 221,183,000 |  |  |
CBL & Associates Properties, Inc. | Unsecured term loans |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Mortgage and other indebtedness amount carrying value |  | $ 450,000,000 | 450,000,000 |  |  |
Treasury Rate | 5.250% Senior Notes Due 2023 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Derivative, basis spread on variable rate |  | 0.40% |  |  |  |
Treasury Rate | Senior Notes Due 2024 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Derivative, basis spread on variable rate |  | 0.35% |  |  |  |
Senior Notes Due 2024 | Unsecured lines of credit |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Unamortized debt discount |  | $ 69,000 | 75,000 |  |  |
Debt instrument, face amount |  |  | $ 300,000,000 |  |  |
Unsecured lines of credit |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Number of unsecured term loans | credit_line |  | 3 |  |  |  |
Mortgage and other indebtedness amount carrying value |  | $ 832,098,000 |  |  |  |
Annual facility Fee (percent) |  | 0.30% |  |  |  |
Total Capacity, line of credit |  | $ 1,300,000,000 |  |  |  |
Unsecured lines of credit | Minimum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Annual facility Fee (percent) |  | 0.15% |  |  |  |
Unsecured term loans |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, face amount |  | $ 400,000,000 |  |  |  |
Interest rate at period end (as a percent) |  | 1.69% |  |  |  |
Unsecured Line of Credit 1 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Mortgage and other indebtedness amount carrying value |  | $ 221,230,000 |  |  |  |
Total Capacity, line of credit |  | 600,000,000 |  |  |  |
First Tennessee |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Mortgage and other indebtedness amount carrying value |  | 26,200,000 |  |  |  |
Total Capacity, line of credit |  | 100,000,000 |  |  |  |
Unsecured Line of Credit 2 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Mortgage and other indebtedness amount carrying value |  | 584,668,000 |  |  |  |
Total Capacity, line of credit |  | 600,000,000 |  |  |  |
Wells Fargo Bank |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total Capacity, line of credit |  | 50,000,000 |  |  |  |
Letter of credit, outstanding |  | $ 6,110,000 |  |  |  |
First Tennessee Bank |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Weighted Average Interest Rate (percent) |  | 1.74% |  |  |  |
Debt instrument, face amount |  | $ 50,000,000 |  |  |  |
Total Capacity, line of credit |  | 20,000,000 |  |  |  |
Letter of credit, outstanding |  | $ 113,000 |  |  |  |

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