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Segment Disclosures - Summary of Total Assets by Segment (Parenthetical) (Detail) - USD ($)	Sep. 30, 2023	Dec. 31, 2022	Dec. 31, 2021	Mar. 31, 2020
Segment Reporting Asset Reconciling Item [Line Items]
Goodwill	$ 53,643,331	$ 53,643,331	$ 53,643,331
Self Storage
Segment Reporting Asset Reconciling Item [Line Items]
Goodwill	52,200,000	52,200,000	49,800,000
Accumulated impairment charges to goodwill	0	0
Managed REIT Platform
Segment Reporting Asset Reconciling Item [Line Items]
Goodwill	$ 1,400,000	1,400,000	3,900,000
Accumulated impairment charges to goodwill		$ 24,700,000	$ 24,700,000	$ 24,700,000

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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