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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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