Unconsolidated Affiliates and Noncontrolling Interests - Variable Interest Entities (Details) - USD ($)	6 Months Ended
Jun. 30, 2019	Sep. 30, 2018
Ambassador Infrastructure, LLC
Noncontrolling Interest [Line Items]
Investment in Real Estate Joint Ventures and Partnerships	$ 0
Maximum Risk of Loss	$ 10,050,000
Debt guaranteed (as a percent)	100.00%
Bullseye, LLC
Noncontrolling Interest [Line Items]
Investment in Real Estate Joint Ventures and Partnerships	$ 5,000
Maximum Risk of Loss	5,000
EastGate Storage, LLC
Noncontrolling Interest [Line Items]
Investment in Real Estate Joint Ventures and Partnerships	939,000
Maximum Risk of Loss	$ 3,000,000
Debt guaranteed (as a percent)	50.00%
G&I VIII CBL Triangle LLC
Noncontrolling Interest [Line Items]
Investment in Real Estate Joint Ventures and Partnerships	$ 0
Maximum Risk of Loss	0
Equity interest in real estate property (as a percent)		90.00%
Parkdale Self Storage, LLC
Noncontrolling Interest [Line Items]
Investment in Real Estate Joint Ventures and Partnerships	1,125,000
Maximum Risk of Loss	$ 6,500,000
Debt guaranteed (as a percent)	100.00%
Equity interest in real estate property (as a percent)	50.00%
Self-Storage at Mid Rivers, LLC
Noncontrolling Interest [Line Items]
Investment in Real Estate Joint Ventures and Partnerships	$ 912,000
Maximum Risk of Loss	2,717,000
Shoppes at Eagle Point, LLC
Noncontrolling Interest [Line Items]
Investment in Real Estate Joint Ventures and Partnerships	16,344,000
Maximum Risk of Loss	16,344,000
Maximum Guaranteed Amount	$ 12,740,000

Debt Instrument, Percentage Guaranteed

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- Definition

Company's maximum guaranteed amount after loans were partially paid down.

+ References

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- Definition

Real Estate Investment, Maximum Loss

+ References

No definition available.

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571

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- 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

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- Definition

The book value of investments in real estate joint ventures including direct and indirect investments.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.1(d))
-URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910

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