Summary of Significant Accounting Policies - Additional Information (Detail)				3 Months Ended			9 Months Ended		12 Months Ended
	Jul. 04, 2025	Aug. 07, 2024 $ / shares shares	Nov. 01, 2023 $ / shares shares	Sep. 30, 2025 USD ($) Contract $ / shares	Jun. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($) Segment Contract $ / shares	Sep. 30, 2024 USD ($)	Dec. 31, 2024 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Number of contracts deemed to be in VIEs | Contract				0			0
Payments to acquire intangible assets							$ 0	$ 0
Property acquisitions							0	0
Business acquisition, transaction costs				$ 82,536		$ 197,752	352,146	615,647
Impairment losses recognized							0	0
Advertising costs				700,000		600,000	$ 2,300,000	1,800,000
Estimated average rental period							18 months
Gross amounts of lease intangibles				9,700,000			$ 9,700,000		$ 9,500,000
Accumulated amortization of lease intangibles				9,700,000			9,700,000		9,500,000
Debt issuance cost amortization expense				200,000		300,000	900,000	800,000
Accumulated amortization of debt issuance costs				600,000			$ 600,000		1,100,000
Maximum period for reimbursement of offering cost							60 days
Maximum offering cost rate							15.00%
Unpaid dealer manager servicing fees							$ 0
Dealer manager servicing fee payable					$ 950,000
Minimum percentage of ordinary taxable income to be distributed to stockholders							90.00%
Allowance for doubtful accounts				40,000			$ 40,000		55,000
Uncertain tax benefits/positions				0			$ 0		0
Number of reportable segments | Segment							1
Assets				530,196,090			$ 530,196,090		529,129,280
Revenues				7,917,819		7,284,002	22,937,817	20,897,301
Units converted | shares		0
Current tax provision							0		0
Income tax penalties and interest expense							$ 0		0
Open tax year							2021 2022 2023 2024
Recent tax legislation	Effective July 4, 2025, the One Big Beautiful Bill Act (“OBBBA”) was signed into law. Certain provisions of OBBBA modified U.S. tax law and impact us and our shareholders. Among other changes, this legislation (i) permanently extended the 20% deduction for “qualified REIT dividends” for individuals and other non-corporate taxpayers under Section 199A of the Code, (ii) permanently reinstated 100% bonus depreciation for certain property acquired after January 19, 2025, (iii) increased the percentage limit under the REIT asset test applicable to taxable REIT subsidiaries from 20% to 25% for taxable years beginning after December 31, 2025, and (iv) increases the base on which the 30% interest deduction limit under Section 163(j) of the Code applies by excluding depreciation, amortization and depletion from the definition of “adjusted taxable income” for taxable years beginning after December 31, 2024. We are currently evaluating the provisions of OBBBA, but do not expect it to have a material impact on our Consolidated Financial Statements.
Sponsor Funding Agreement
Summary Of Significant Accounting Policies [Line Items]
Net asset value per share | $ / shares		$ 10
Canada | Self Storage
Summary Of Significant Accounting Policies [Line Items]
Assets				289,400,000			$ 289,400,000		278,200,000
Revenues				4,400,000		4,000,000	$ 12,700,000	11,400,000
Rental Income | Geographic Concentration Risk | Arizona
Summary Of Significant Accounting Policies [Line Items]
Concentration risk percentage							15.00%
Rental Income | Geographic Concentration Risk | Florida
Summary Of Significant Accounting Policies [Line Items]
Concentration risk percentage							12.00%
Rental Income | Geographic Concentration Risk | Canada
Summary Of Significant Accounting Policies [Line Items]
Concentration risk percentage							49.00%
Distribution
Summary Of Significant Accounting Policies [Line Items]
Redemption total				$ 3,700,000		$ 1,700,000	$ 3,700,000	1,700,000
Redemption fulfilled							3,500,000	1,200,000
Redemption payable							$ 200,000	$ 500,000
Private Offering Dealer Manager Agreement
Summary Of Significant Accounting Policies [Line Items]
Maximum sale commission fees percentage of proceed from private offering							6.00%
Maximum dealer manager commission fees percentage of proceed from private offering							3.00%
Underwriting compensation							10.00%
Maximum percentage other non-accountable expenses							3.00%
Class W Common Stock
Summary Of Significant Accounting Policies [Line Items]
Percentage of offering cost without reimbursement							1.00%
Net asset value per share | $ / shares		10
Class W Common Stock | Dealer Manager
Summary Of Significant Accounting Policies [Line Items]
Maximum sale commission fees percentage of proceed from Primary Offering							1.50%
Percentage of gross proceeds from sale of shares							10.00%
Maximum dealer manager servicing fee percentage of proceeds from Primary Offering							9.00%
Class W Common Stock | Dealer Manager Servicing Fees
Summary Of Significant Accounting Policies [Line Items]
Monthly servicing fee accrual description							accrued daily in an amount equal to 1/365th of 0.5% of the purchase price per share
Class A Common Stock
Summary Of Significant Accounting Policies [Line Items]
Net asset value per share | $ / shares		$ 10
Units converted | shares		0	0
Class A Common Stock | Sponsor Funding Agreement
Summary Of Significant Accounting Policies [Line Items]
Net asset value per share | $ / shares			$ 10
Class A Common Stock | Dealer Manager
Summary Of Significant Accounting Policies [Line Items]
Maximum sale commission fees percentage of proceed from Primary Offering							6.00%
Maximum dealer manager commission fee percentage of proceeds from Primary Offering							3.00%
Percentage of gross proceeds from sale of shares							10.00%
Class T Common Stock
Summary Of Significant Accounting Policies [Line Items]
Net asset value per share | $ / shares		$ 10
Class T Common Stock | Dealer Manager
Summary Of Significant Accounting Policies [Line Items]
Maximum sale commission fees percentage of proceed from Primary Offering							3.00%
Maximum dealer manager commission fee percentage of proceeds from Primary Offering							3.00%
Percentage of gross proceeds from sale of shares							10.00%
Class T Common Stock | Stockholder Servicing Fees
Summary Of Significant Accounting Policies [Line Items]
Monthly servicing fee accrual description							accrued daily in an amount equal to 1/365th of 1% of the purchase price per share
Class Z Common Stock
Summary Of Significant Accounting Policies [Line Items]
Price per share | $ / shares			9.3
Net asset value per share | $ / shares		10
Class Z Common Stock | Dealer Manager
Summary Of Significant Accounting Policies [Line Items]
Maximum sale commission fees percentage of proceed from Primary Offering							1.50%
Percentage of gross proceeds from sale of shares							10.00%
Maximum dealer manager servicing fee percentage of proceeds from Primary Offering							9.00%
Class Z Common Stock | Dealer Manager Servicing Fees
Summary Of Significant Accounting Policies [Line Items]
Monthly servicing fee accrual description							accrued daily in an amount equal to 1/365th of 0.5% of the purchase price per share
Class Y Common Stock
Summary Of Significant Accounting Policies [Line Items]
Price per share | $ / shares			$ 9.3
Net asset value per share | $ / shares		$ 10
Class Y Common Stock | Sponsor Funding Agreement
Summary Of Significant Accounting Policies [Line Items]
Percentage of upfront sales commission			3.00%
Percentage of upfront dealer manager fee			3.00%
Class Y Common Stock | Dealer Manager
Summary Of Significant Accounting Policies [Line Items]
Maximum sale commission fees percentage of proceed from Primary Offering							3.00%
Maximum dealer manager commission fee percentage of proceeds from Primary Offering							3.00%
Percentage of gross proceeds from sale of shares							10.00%
Class Y Common Stock | Stockholder Servicing Fees
Summary Of Significant Accounting Policies [Line Items]
Monthly servicing fee accrual description							accrued daily in an amount equal to 1/365th of 1% of the purchase price per share
Class Y Shares and Class Z Shares | Sponsor Funding Agreement
Summary Of Significant Accounting Policies [Line Items]
Percentage of organization and offering expenses			1.00%
Price per share | $ / shares			$ 9.3	$ 10			$ 10
Series E Preferred Stock
Summary Of Significant Accounting Policies [Line Items]
Percentage of offering cost without reimbursement							1.00%
Minimum
Summary Of Significant Accounting Policies [Line Items]
Estimated useful life							3 years
Maximum
Summary Of Significant Accounting Policies [Line Items]
Estimated useful life							5 years
Maximum offering cost rate							15.00%
Carry Forward of Non-capital Losses
Summary Of Significant Accounting Policies [Line Items]
Uncertain tax benefits/positions				$ 9,000,000			$ 9,000,000		$ 6,700,000