Contingencies - Guarantees (Details) - USD ($)	9 Months Ended
Sep. 30, 2021	Dec. 31, 2020
Guarantor Obligations [Line Items]
Obligation Recorded to Reflect Guaranty	$ 899,000	$ 923,000
Shoppes at Eagle Point, LLC
Guarantor Obligations [Line Items]
Maximum Guaranteed Amount	$ 12,740,000
Ambassador Infrastructure, LLC
Guarantor Obligations [Line Items]
Company's Ownership Interest (as a percent)	65.00%
Outstanding Balance	$ 8,250,000
Percentage Guaranteed by the Operating Partnership (as a percent)	100.00%
Maximum Guaranteed Amount	$ 8,250,000
Obligation Recorded to Reflect Guaranty	$ 83,000	94,000
Hamilton Place Self Storage, LLC
Guarantor Obligations [Line Items]
Company's Ownership Interest (as a percent)	54.00%
Outstanding Balance	$ 6,863,000
Percentage Guaranteed by the Operating Partnership (as a percent)	50.00%
Maximum Guaranteed Amount	$ 3,501,000
Obligation Recorded to Reflect Guaranty	$ 35,000	35,000
West Melbourne I, LLC - Phase I
Guarantor Obligations [Line Items]
Company's Ownership Interest (as a percent)	50.00%
Outstanding Balance	$ 39,326,000
Percentage Guaranteed by the Operating Partnership (as a percent)	50.00%
Maximum Guaranteed Amount	$ 19,663,000
Obligation Recorded to Reflect Guaranty	$ 197,000	201,000
West Melbourne I, LLC - Phase II
Guarantor Obligations [Line Items]
Company's Ownership Interest (as a percent)	50.00%
Outstanding Balance	$ 14,034,000
Percentage Guaranteed by the Operating Partnership (as a percent)	50.00%
Maximum Guaranteed Amount	$ 7,017,000
Obligation Recorded to Reflect Guaranty	$ 70,000	72,000
Port Orange I, LLC
Guarantor Obligations [Line Items]
Company's Ownership Interest (as a percent)	50.00%
Outstanding Balance	$ 51,998,000
Percentage Guaranteed by the Operating Partnership (as a percent)	50.00%
Maximum Guaranteed Amount	$ 25,999,000
Obligation Recorded to Reflect Guaranty	$ 260,000	266,000
Shoppes at Eagle Point, LLC
Guarantor Obligations [Line Items]
Company's Ownership Interest (as a percent)	50.00%
Outstanding Balance	$ 34,135,000
Percentage Guaranteed by the Operating Partnership (as a percent)	35.00%
Maximum Guaranteed Amount	$ 12,740,000
Obligation Recorded to Reflect Guaranty	$ 127,000	127,000
Option extension term of debt instrument	1 year
EastGate Storage, LLC
Guarantor Obligations [Line Items]
Company's Ownership Interest (as a percent)	50.00%
Outstanding Balance	$ 6,460,000
Percentage Guaranteed by the Operating Partnership (as a percent)	50.00%
Maximum Guaranteed Amount	$ 3,230,000
Obligation Recorded to Reflect Guaranty	$ 32,000	33,000
Reduction of guarantor obligations once certain debt and operational metrics are met (as a percent)	25.00%
Self Storage at Mid Rivers, LLC
Guarantor Obligations [Line Items]
Company's Ownership Interest (as a percent)	50.00%
Outstanding Balance	$ 5,941,000
Percentage Guaranteed by the Operating Partnership (as a percent)	50.00%
Maximum Guaranteed Amount	$ 2,971,000
Obligation Recorded to Reflect Guaranty	$ 30,000	30,000
Parkdale Self Storage LLC
Guarantor Obligations [Line Items]
Company's Ownership Interest (as a percent)	50.00%
Outstanding Balance	$ 6,462,000
Percentage Guaranteed by the Operating Partnership (as a percent)	100.00%
Maximum Guaranteed Amount	$ 6,500,000
Obligation Recorded to Reflect Guaranty	$ 65,000	$ 65,000
Increased guarantee as result of filed chapter 11 case	100.00%
Atlanta Outlet Outparcels, LLC
Guarantor Obligations [Line Items]
Company's Ownership Interest (as a percent)	50.00%
Outstanding Balance	$ 4,504,000
Percentage Guaranteed by the Operating Partnership (as a percent)	100.00%
Maximum Guaranteed Amount	$ 4,504,000
Louisville Outlet Shoppes, LLC
Guarantor Obligations [Line Items]
Company's Ownership Interest (as a percent)	50.00%
Outstanding Balance	$ 8,512,000
Percentage Guaranteed by the Operating Partnership (as a percent)	100.00%
Maximum Guaranteed Amount	$ 8,512,000
West Melbourne I LLC Phase I, West Melbourne I LLC Phase II and Port Orange I, LLC
Guarantor Obligations [Line Items]
Option extension term of debt instrument	1 year
York Town Center Lp
Guarantor Obligations [Line Items]
Company's Ownership Interest (as a percent)	50.00%
Undiscounted maximum exposure	$ 10,000,000
Guarantor obligations recoverable (as a percent)	50.00%

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Guarantor Obligations, Guaranty Reduction Percentage, Once Certain Debt and Operational Metrics Are Met

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Guarantor obligations increased guarantee as result of filed chapter eleven case.

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- Definition

Percentage of third party construction loan guaranteed by the company.

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Represents amount recoverable by guarantor from third parties for amounts paid under the guaranty.

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

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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.

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-Publisher FASB
-Name Accounting Standards Codification
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Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

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- Definition

Fair value portion of guarantee, including, but not limited to, financial standby letter of credit, fair value guarantee, guarantee of collection of scheduled contractual cash flows from financial assets, and contracts that contingently require the guarantor to make payments or perform services.

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- Definition

This element represents the current and noncurrent portions of a long-term real estate loan with an initial maturity beyond one year or beyond the normal operating cycle, if longer, to finance building costs. The funds are disbursed as needed or in accordance with a prearranged plan; generally, a portion of the funds is disbursed at inception and the remainder as construction progresses. The money is repaid on completion of the project (generally one to seven years), usually from the proceeds of a mortgage loan. The rate is normally higher than the prime rate, and there is usually an origination fee. The effective yield on these loans tends to be high, and the lender has a security interest in the real property.

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- Definition

The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

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