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Unconsolidated Affiliates and Noncontrolling Interests - Narrative (Details) | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Sep. 30, 2018 USD ($) yr entity | Apr. 30, 2018 USD ($) | Sep. 30, 2018 USD ($) yr holder entity shares | Mar. 31, 2018 shares | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) yr entity shares | Sep. 30, 2017 USD ($) shares | Dec. 31, 2017 USD ($) | Sep. 29, 2018 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Number of equity method investment entities | entity | 19 |  | 19 |  |  | 19 |  |  |
Number of joint ventures | entity | 14 |  | 14 |  |  | 14 |  |  |
Loss on impairment |  |  | $ 14,600,000 |  | $ 24,935,000 | $ 84,644,000 | $ 71,401,000 | $ 67,532,000 |
Gain on investment related to land contributed to joint venture |  | $ 387,000 |  |  |  |  |  |  |
Cash paid upon conversion of common units |  |  | $ 2,246,000 |  |  |  |  |  |
Number of holders of common units | holder |  |  | 2 |  |  |  |  |  |
Issuances of common units (shares) | shares |  |  |  |  |  | 716,290 | 342,008 |  |
Number of variable interest entities | entity |  |  |  |  |  | 19 |  |  |
Ownership in variable interest entity (as a percent) |  |  |  |  |  | 50.00% |  |  |
Minimum |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Equity interest in real estate property (as a percent) | 10.00% |  | 10.00% |  |  | 10.00% |  |  |
Maximum |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Equity interest in real estate property (as a percent) | 65.00% |  | 65.00% |  |  | 65.00% |  |  |
Ownership in variable interest entity (as a percent) |  |  |  |  |  | 95.00% |  |  |
Unconsolidated Properties |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Issuances of common units (shares) | shares |  |  | 526,510 | 915,338 |  |  |  |  |
G&I VIII CBL Triangle LLC |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Loss on impairment | $ 89,826,000 |  |  |  |  | $ 1,022,000 |  |  |
Real estate investment | 0 |  | $ 0 |  |  | 0 |  |  |
Fair value of joint venture | $ 33,600,000 |  | $ 33,600,000 |  |  | $ 33,600,000 |  |  | $ 123,453,000
Expected Term | G&I VIII CBL Triangle LLC |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Fair value measurement input | yr | 10 |  | 10 |  |  | 10 |  |  |
Cap Rate | G&I VIII CBL Triangle LLC |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Fair value measurement input | 0.15 |  | 0.15 |  |  | 0.15 |  |  |
Discount Rate | G&I VIII CBL Triangle LLC |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Fair value measurement input | 0.15 |  | 0.15 |  |  | 0.15 |  |  |

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