Organization - Additional Information (Detail)										3 Months Ended			6 Months Ended
	Mar. 20, 2026 $ / shares shares	Dec. 31, 2025 shares	Sep. 04, 2025 USD ($) $ / shares shares	Nov. 01, 2023 $ / shares shares	May 01, 2023 USD ($) shares	Mar. 17, 2022 USD ($) shares	Mar. 10, 2021 USD ($) shares	Feb. 26, 2021 USD ($)	Jan. 15, 2021 USD ($)	Dec. 31, 2025 USD ($) shares	Jun. 30, 2025 shares	Mar. 31, 2025 shares	Jun. 30, 2026 USD ($) ft² OperatingSelfStorageProperty UnconsolidatedRealEstateVenture $ / shares shares	Jun. 30, 2025 USD ($)	Jun. 02, 2026 USD ($)	Sep. 30, 2025 USD ($)	May 30, 2025 $ / shares
Organization And Nature Of Operations [Line Items]
Gross proceeds from issuance of common stock														$ 15,170,192
Number of operating self storage properties owned | OperatingSelfStorageProperty													25
Number of unconsolidated real estate ventures | UnconsolidatedRealEstateVenture													5
Advisor purchased initial investment in operating partnership													$ 202,000
Funding received from sponsor													10,200,000
Sale of Stock, Consideration Received on Transaction					$ 150,000,000
Issuance costs													$ 326,444	$ 1,809,770
Wholly-owned self storage facilities													12
Self storage units													9,215
Net rentable square feet | ft²													981,465
Units converted | shares	0
Purchase Agreement
Organization And Nature Of Operations [Line Items]
Aggregate value of shares committed to purchase					$ 150,000,000
Managing Dealer Agreement
Organization And Nature Of Operations [Line Items]
Percentage of sales commissions																6.00%
Percentage of managing dealer fees																3.50%
Percentage of aggregate shares committed																0.15%
Maximum aggregate value of shares committed to pay																$ 550,000
Sponsor Funding Agreement
Organization And Nature Of Operations [Line Items]
Estimated per share NAV | $ / shares	$ 10
Distribution Reinvestment Plan
Organization And Nature Of Operations [Line Items]
Gross proceeds from issuance of common stock													$ 23,000,000
Distribution reinvestment plan termination notice period													10 days
Class A Common Stock
Organization And Nature Of Operations [Line Items]
One time stock dividend | $ / shares				$ 0.11075
Estimated per share NAV | $ / shares	$ 10
Units converted | shares	0			0
Class A Common Stock | Sponsor Funding Agreement
Organization And Nature Of Operations [Line Items]
Estimated per share NAV | $ / shares				$ 10
Class A Common Stock | Distribution Reinvestment Plan
Organization And Nature Of Operations [Line Items]
Common stock issued in connection with offering | shares													300,000
Price per share | $ / shares				9.3
Class A Common Stock | Pubic Offering | Common Stock
Organization And Nature Of Operations [Line Items]
Common stock issued in connection with offering | shares													2,900,000
Class A Common Stock | Private Offering
Organization And Nature Of Operations [Line Items]
Gross proceeds from issuance of common stock													$ 30,300,000
Class P Common Stock
Organization And Nature Of Operations [Line Items]
Gross proceeds from issuance of common stock						$ 100,700,000
Estimated per share NAV | $ / shares	$ 10
Class P Common Stock | Common Stock
Organization And Nature Of Operations [Line Items]
Common stock issued in connection with offering | shares												64,865
Class P Common Stock | Distribution Reinvestment Plan
Organization And Nature Of Operations [Line Items]
Common stock issued in connection with offering | shares													1,300,000
Class P Common Stock | Private Offering | Common Stock
Organization And Nature Of Operations [Line Items]
Common stock issued in connection with offering | shares						10,600,000
Class T Common Stock
Organization And Nature Of Operations [Line Items]
One time stock dividend | $ / shares				0.07526
Estimated per share NAV | $ / shares	10
Class T Common Stock | Distribution Reinvestment Plan
Organization And Nature Of Operations [Line Items]
Common stock issued in connection with offering | shares													400,000
Price per share | $ / shares				9.3
Class T Common Stock | Private Offering
Organization And Nature Of Operations [Line Items]
Gross proceeds from issuance of common stock													$ 48,100,000
Class T Common Stock | Private Offering | Common Stock
Organization And Nature Of Operations [Line Items]
Common stock issued in connection with offering | shares													4,800,000
Class W Common Stock
Organization And Nature Of Operations [Line Items]
One time stock dividend | $ / shares				0.01075
Estimated per share NAV | $ / shares	10
Class W Common Stock | Distribution Reinvestment Plan
Organization And Nature Of Operations [Line Items]
Common stock issued in connection with offering | shares													100,000
Price per share | $ / shares				9.3
Class W Common Stock | Private Offering
Organization And Nature Of Operations [Line Items]
Gross proceeds from issuance of common stock													$ 6,300,000
Class W Common Stock | Private Offering | Common Stock
Organization And Nature Of Operations [Line Items]
Common stock issued in connection with offering | shares													700,000
Series D Cumulative Redeemable Preferred Units
Organization And Nature Of Operations [Line Items]
Common stock issued in connection with offering | shares		1,400,000
Issuance of preferred units | shares			1,000,000
Preferred units, liquidation preference | $ / shares			$ 25
Capital contribution to operating partnership			$ 25,000,000
Series D Preferred Units
Organization And Nature Of Operations [Line Items]
Issuance of preferred units | shares		400,000								400,000
Aggregate consideration										$ 10,000,000
Series E Preferred Offering
Organization And Nature Of Operations [Line Items]
Gross proceeds from issuance of common stock													$ 1,000,000
Common stock issued in connection with offering | shares													98,000
Series E Preferred Offering | Managing Dealer Agreement
Organization And Nature Of Operations [Line Items]
Percentage of aggregate shares committed															1.60%
Maximum aggregate value of shares committed to pay															$ 550,000
Percentage of annual maintenance fee															0.10%
Series E Preferred Offering | Maximum
Organization And Nature Of Operations [Line Items]
Preferred stock, value authorized																75,000,000
Preferred stock, value authorized expandable																$ 100,000,000
Series B Convertible Preferred Stock
Organization And Nature Of Operations [Line Items]
Common stock issued in connection with offering | shares					150,000,000
Series B Convertible Preferred Stock | Purchase Agreement
Organization And Nature Of Operations [Line Items]
Issuance costs					$ 1,400,000
Class Y Common Stock
Organization And Nature Of Operations [Line Items]
Price per share | $ / shares				9.3
Estimated per share NAV | $ / shares	10
Class Y Common Stock | Common Stock
Organization And Nature Of Operations [Line Items]
Common stock issued in connection with offering | shares											611,712	627,757
Class Y Common Stock | Distribution Reinvestment Plan
Organization And Nature Of Operations [Line Items]
Common stock issued in connection with offering | shares													300,000
Class Y Common Stock | Private Offering
Organization And Nature Of Operations [Line Items]
Gross proceeds from issuance of common stock													$ 50,600,000
Class Y Common Stock | Private Offering | Common Stock
Organization And Nature Of Operations [Line Items]
Common stock issued in connection with offering | shares													5,200,000
Class Z Common Stock
Organization And Nature Of Operations [Line Items]
Price per share | $ / shares				9.3
Estimated per share NAV | $ / shares	$ 10
Class Z Common Stock | Common Stock
Organization And Nature Of Operations [Line Items]
Common stock issued in connection with offering | shares											180,800	41,250
Class Z Common Stock | Distribution Reinvestment Plan
Organization And Nature Of Operations [Line Items]
Common stock issued in connection with offering | shares													17,000
Class Z Common Stock | Private Offering
Organization And Nature Of Operations [Line Items]
Gross proceeds from issuance of common stock													$ 5,500,000
Class Z Common Stock | Private Offering | Common Stock
Organization And Nature Of Operations [Line Items]
Common stock issued in connection with offering | shares													600,000
Class Y Shares and Class Z Shares | Sponsor Funding Agreement
Organization And Nature Of Operations [Line Items]
Price per share | $ / shares				$ 9.3									$ 10				$ 10
Strategic Storage Advisor IV, LLC
Organization And Nature Of Operations [Line Items]
Sale of common shares to advisor									$ 1,000
Advisor purchased initial investment in operating partnership									$ 1,000
Smartstop Storage Advisors LLC.
Organization And Nature Of Operations [Line Items]
Investment by affiliate in exchange for additional limited partnership interests								$ 1,000
Smartstop OP, L.P
Organization And Nature Of Operations [Line Items]
Equity ownership percentage													2.00%
Advisor purchased a limited partnership interest in Operating Partnership, number of partnership units | shares							549,451
Initial capital contribution							$ 5,000,000
Strategic Storage Operating Partnership VI, L.P.
Organization And Nature Of Operations [Line Items]
Equity ownership percentage													98.00%
SmartCentres
Organization And Nature Of Operations [Line Items]
Equity ownership percentage													50.00%
Strategic Storage Growth Trust III, Inc.
Organization And Nature Of Operations [Line Items]
Equity ownership percentage													50.00%