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UNCONSOLIDATED AFFILIATES AND COST METHOD INVESTMENT - Joint Ventures (Details) | 1 Months Ended | 3 Months Ended | 7 Months Ended | 9 Months Ended | 12 Months Ended |  |
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Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) yr | Apr. 30, 2018 USD ($) | Nov. 30, 2017 USD ($) | Aug. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) office_building | Mar. 31, 2016 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) subsidiary | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) yr | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Sep. 29, 2018 USD ($) | Jul. 31, 2016 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on impairment |  |  |  |  |  |  |  |  |  |  |  |  | $ 71,285,000 |  | $ 174,529,000 | $ 71,401,000 | $ 116,822,000 |  |
Gross sales price |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 65,000,000 | 189,750,000 | 194,710,000 |  |
Net sales price |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 53,402,000 | 112,076,000 | 189,531,000 |  |
Gain (loss) on sales of real estate assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 19,001,000 | 93,792,000 | 29,567,000 |  |
Mortgage and other indebtedness, variable-rate debt | $ 955,751,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | 955,751,000 | 1,090,810,000 |  |  |
Gain (loss) on extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30,927,000 |  |  |
Mortgage debt assumed by buyer of real estate assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 38,150,000 |  |
Gain (loss) on investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (6,197,000) | 7,534,000 |  |
Mortgages |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage note payables assumed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 38,150,000
Non-Recourse Loans on Operating Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage and other indebtedness, variable-rate debt | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 10,836,000 |  |  |
CBL & Associates Properties, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 174,529,000 | 71,401,000 | 116,822,000 |  |
Gain (loss) on sales of real estate assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 19,001,000 | 93,792,000 | 29,567,000 |  |
Gain (loss) on extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 30,927,000 | 0 |  |
Gain (loss) on investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ (6,197,000) | 7,534,000 |  |
G&I VIII CBL Triangle LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on impairment |  | $ 89,826,000 |  |  |  |  |  |  |  |  |  |  |  | $ 1,022,000 |  |  |  |  |
Fair value of real estate joint ventures |  | 33,600,000 |  |  |  |  |  |  |  |  |  |  |  | 33,600,000 |  |  |  | $ 123,453,000 |
Net real estate investments |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |
Renaissance Center |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross sales price |  |  |  |  |  |  |  |  |  |  | $ 129,200,000 |  |  |  |  |  |  |  |
River Ridge Mall JV, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on impairment |  |  |  |  |  | $ 84,000 |  |  |  |  |  | $ 9,510,000 |  |  |  |  | 9,594,000 |  |
Gross sales price |  |  |  |  |  |  | $ 33,500,000 |  |  |  |  |  |  |  |  |  |  |  |
Net sales price |  |  |  |  |  |  | 32,905,000 |  |  |  |  |  |  |  |  |  |  |  |
Reserve for future capital expenditures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,100,000 |  |
River Ridge Mall JV, LLC | Parent Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on sales of real estate assets |  |  |  |  |  |  |  |  | $ (5,843,000) |  |  |  |  |  |  |  |  |  |
Renaissance Center - Phase I | Mortgages |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage debt assumed by buyer of real estate assets |  |  |  |  |  |  |  |  |  |  | 16,000,000 |  |  |  |  |  |  |  |
Defeasance of debt in disposition |  |  |  |  |  |  |  |  |  |  | 31,484,000 |  |  |  |  |  |  |  |
Corporate Joint Venture | River Ridge Mall JV, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash contributed by third party |  |  |  |  |  |  |  |  |  |  |  | 33,500,000 |  |  |  |  |  |  |
Quoted market value |  |  |  |  |  |  | $ 7,000,000 |  |  |  |  | 7,000,000 |  |  |  |  |  |  |
Repayment of long term line of credit |  |  |  |  |  |  |  |  |  |  |  | $ 32,819,000 |  |  |  |  |  |  |
Continental 425 Fund LLC | Parent Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital contribution, land | 6,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash contributed | $ 7,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Membership units owned (as a percent) | 43.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self Storage at Mid Rivers, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Realized investment gains (losses) |  |  | $ 387,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self Storage at Mid Rivers, LLC | Parent Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest in joint venture (as a percent) |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self Storage at Mid Rivers, LLC | Corporate Joint Venture |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest in joint venture (as a percent) |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
River Ridge Mall JV, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest in joint venture (as a percent) |  |  |  |  |  | 25.00% |  | 25.00% |  |  |  |  | 25.00% |  |  |  | 25.00% |  |
Proceeds from sale of joint venture |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,000,000 |  |  |  |  |
Loss on sale of investment |  |  |  |  | $ 354,000 |  |  |  |  |  |  |  |  | $ 5,843,000 |  |  |  |  |
River Ridge Mall JV, LLC | Parent Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest in joint venture (as a percent) |  |  |  |  |  |  | 25.00% |  |  |  |  | 25.00% |  |  |  |  |  |  |
River Ridge Mall JV, LLC | Corporate Joint Venture |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest in joint venture (as a percent) |  |  |  |  |  |  | 75.00% |  |  |  |  | 75.00% |  |  |  |  |  |  |
Shoppes at Eagle Point, LLC | Parent Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest in joint venture (as a percent) |  |  |  |  |  |  |  | 50.00% |  |  |  |  | 50.00% |  |  |  |  |  |
Shoppes at Eagle Point, LLC | Corporate Joint Venture |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest in joint venture (as a percent) |  |  |  |  |  |  |  | 50.00% |  |  |  |  | 50.00% |  |  |  |  |  |
Cash contributed by third party |  |  |  |  |  |  |  | $ 1,031,000 |  |  |  |  |  |  |  |  |  |  |
EastGate Storage, LLC | Parent Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital contribution, land |  |  |  | $ 1,134,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest in joint venture (as a percent) |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
EastGate Storage, LLC | Corporate Joint Venture |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest in joint venture (as a percent) |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
JG Gulf Coast Town Center LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on investments |  |  |  |  |  |  |  |  |  |  | $ 29,267,000 |  |  |  |  |  |  |  |
JG Gulf Coast Town Center LLC | Parent Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest in joint venture (as a percent) |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |
JG Gulf Coast Town Center LLC | Non-Recourse Loans on Operating Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage and other indebtedness, variable-rate debt |  |  |  |  |  |  |  |  |  |  | $ 190,800,000 |  |  |  |  |  |  |  |
JG Gulf Coast Town Center LLC | CBL & Associates Properties, Inc. | Non-Recourse Loans on Operating Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage and other indebtedness, variable-rate debt |  |  |  |  |  |  |  |  |  |  | 95,400,000 |  |  |  |  |  |  |  |
JG Gulf Coast Town Center LLC | Corporate Joint Venture |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on extinguishment of debt |  |  |  |  |  |  |  |  |  |  | 63,294,000 |  |  |  |  |  |  |  |
Gulf Coast Town Center - Phase III |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest in joint venture (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |
Gulf Coast Town Center - Phase III | Parent Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest in joint venture (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |
CBL-TRS Joint Venture, LLC | Corporate Joint Venture |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of office buildings sold (office building) | office_building |  |  |  |  |  | 4 |  |  |  |  |  |  |  |  |  |  |  |  |
Gross sales price |  |  |  |  |  | $ 26,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales price |  |  |  |  |  | 25,406,000 |  |  |  | $ 14,962,000 |  |  |  |  |  |  |  |  |
Gain (loss) on sales of real estate assets |  |  |  |  |  | 51,000 |  |  |  |  |  |  |  |  |  |  |  |  |
CBL-TRS Joint Venture, LLC | Corporate Joint Venture | Other Ownership Interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales price |  |  |  |  |  | 12,703,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on sales of real estate assets |  |  |  |  |  | 25,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Triangle Town Member LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on sales of real estate assets |  |  |  |  |  | $ 2,820,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Triangle Town Member LLC | Parent Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest in joint venture (as a percent) |  |  |  |  |  | 10.00% | 50.00% |  |  |  |  | 50.00% |  |  |  |  | 10.00% |  |
Gain (loss) on sales of real estate assets |  |  |  |  |  | $ 282,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Triangle Town Member LLC | Mortgages | Parent Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage note payables assumed |  |  |  |  |  |  | $ 17,109,000 |  |  |  |  | $ 17,109,000 |  |  |  |  |  |  |
Triangle Town Member LLC | Corporate Joint Venture |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest in joint venture (as a percent) |  |  |  |  |  | 90.00% | 50.00% |  |  |  |  | 50.00% |  |  |  |  | 90.00% |  |
Gross sales price |  |  |  |  |  | $ 30,250,000 |  |  |  |  |  | $ 174,000,000 |  |  |  |  |  |  |
Net sales price |  |  |  |  |  | 29,802,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on sales of real estate assets |  |  |  |  |  | 2,538,000 |  |  |  |  |  | 80,979,000 |  |  |  |  |  |  |
Mortgage and other indebtedness, variable-rate debt |  |  |  |  |  | $ 29,342,000 |  |  |  |  |  |  |  |  |  |  | $ 29,342,000 |  |
Equity contribution |  |  |  |  |  |  |  |  |  |  |  | 3,060,000 |  |  |  |  |  |  |
Triangle Town Member LLC | Corporate Joint Venture | Mortgages |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage note payables assumed |  |  |  |  |  |  | $ 171,092,000 |  |  |  |  | 171,092,000 |  |  |  |  |  |  |
Triangle Town Member LLC | Corporate Joint Venture | Mortgages | Other Ownership Interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage note payables assumed |  |  |  |  |  |  | $ 85,546,000 |  |  |  |  | $ 85,546,000 |  |  |  |  |  |  |
High Pointe Commons, LP and High Pointe Commons II-HAP, LP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of subsidiaries owned by the company (subsidiary) | subsidiary |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |
High Pointe Commons | Parent Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest in joint venture (as a percent) |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |
High Pointe Commons | Mortgages |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Extinguishment of debt |  |  |  |  |  |  |  |  |  | $ 17,388,000 |  |  |  |  |  |  |  |  |
High Pointe Commons | Corporate Joint Venture |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest in joint venture (as a percent) |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |
Gross sales price |  |  |  |  |  |  |  |  |  | $ 33,800,000 |  |  |  |  |  |  |  |  |
Gain (loss) on sales of real estate assets |  |  |  |  |  |  |  |  |  | 16,649,000 |  |  |  |  |  |  |  |  |
Gain (loss) on extinguishment of debt |  |  |  |  |  |  |  |  |  | (393,000) |  |  |  |  |  |  |  |  |
High Pointe Commons | Corporate Joint Venture | Other Ownership Interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales price |  |  |  |  |  |  |  |  |  | 7,481,000 |  |  |  |  |  |  |  |  |
Gain (loss) on sales of real estate assets |  |  |  |  |  |  |  |  |  | 8,324,000 |  |  |  |  |  |  |  |  |
Gain (loss) on extinguishment of debt |  |  |  |  |  |  |  |  |  | $ (197,000) |  |  |  |  |  |  |  |  |
Renaissance Center | Corporate Joint Venture |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales price |  |  |  |  |  |  |  |  |  |  | 80,324,000 |  |  |  |  |  |  |  |
Gain (loss) on sales of real estate assets |  |  |  |  |  |  |  |  |  |  | 59,977,000 |  |  |  |  |  |  |  |
Renaissance Center | Corporate Joint Venture | Other Ownership Interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales price |  |  |  |  |  |  |  |  |  |  | 40,162,000 |  |  |  |  |  |  |  |
Gain (loss) on sales of real estate assets |  |  |  |  |  |  |  |  |  |  | $ 29,989,000 |  |  |  |  |  |  |  |
Expected Term | G&I VIII CBL Triangle LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Measurement input | yr |  | 10 |  |  |  |  |  |  |  |  |  |  |  | 10 |  |  |  |  |
Cap Rate (as a percent) | G&I VIII CBL Triangle LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Measurement input |  | 0.15 |  |  |  |  |  |  |  |  |  |  |  | 0.15 |  |  |  |  |
Discount Rate (as a percent) | G&I VIII CBL Triangle LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Measurement input |  | 0.15 |  |  |  |  |  |  |  |  |  |  |  | 0.15 |  |  |  |  |

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