Organization - Additional Information (Detail)								3 Months Ended						9 Months Ended
	Aug. 07, 2024 $ / 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 ($) $ / shares	Sep. 30, 2025 USD ($) UnconsolidatedRealEstateVenture OperatingSelfStorageProperty $ / shares shares	Jun. 30, 2025 shares	Mar. 31, 2025 shares	Sep. 30, 2024 shares	Jun. 30, 2024 shares	Mar. 31, 2024 shares	Sep. 30, 2025 USD ($) UnconsolidatedRealEstateVenture OperatingSelfStorageProperty $ / shares shares	Sep. 30, 2024 USD ($)	Sep. 04, 2025 $ / shares	Dec. 31, 2024 $ / shares
Organization And Nature Of Operations [Line Items]
Number of operating self storage properties owned | OperatingSelfStorageProperty								24						24
Number of unconsolidated real estate ventures | UnconsolidatedRealEstateVenture								5						5
Advisor purchased initial investment in operating partnership | $														$ 202,000
Sale of Stock, Consideration Received on Transaction | $			$ 150,000,000
Issuance costs | $														$ 2,075,386	$ 2,699,312
Units converted | shares	0
Preferred Stock, par value							$ 0.001	$ 0.001						$ 0.001			$ 0.001
Purchase Agreement
Organization And Nature Of Operations [Line Items]
Aggregate value of shares committed to purchase | $			$ 150,000,000
Sponsor Funding Agreement
Organization And Nature Of Operations [Line Items]
Estimated per share NAV	$ 10
Managing Dealer Agreement
Organization And Nature Of Operations [Line Items]
Percentage of sales commissions								6.00%						6.00%
Percentage of managing dealer fees								3.50%						3.50%
Percentage of aggregate shares committed								0.15%						0.15%
Maximum aggregate value of shares committed to pay | $								$ 550,000						$ 550,000
Distribution Reinvestment Plan
Organization And Nature Of Operations [Line Items]
Gross proceeds from issuance of common stock | $														$ 18,000,000
Distribution reinvestment plan termination notice period														10 days
Class A Common Stock
Organization And Nature Of Operations [Line Items]
One time stock dividend		$ 0.11075
Estimated per share NAV	$ 10
Units converted | shares	0	0
Class A Common Stock | Sponsor Funding Agreement
Organization And Nature Of Operations [Line Items]
Estimated per share NAV		$ 10
Class A Common Stock | Distribution Reinvestment Plan
Organization And Nature Of Operations [Line Items]
Common stock issued in connection with offering | shares														200,000
Price per share		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	$ 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														1,100,000
Price per share		9.3
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		0.07526
Estimated per share NAV	10
Class T 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		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		0.01075
Estimated per share NAV	10
Class W Common Stock | Distribution Reinvestment Plan
Organization And Nature Of Operations [Line Items]
Common stock issued in connection with offering | shares														51,000
Price per share		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														1,000,000
Issuance of preferred units | shares								1,000,000						1,000,000
Preferred units, liquidation preference								$ 25						$ 25
Capital contribution to operating partnership | $														$ 25,000,000
Preferred Stock, par value																$ 25
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		9.3
Estimated per share NAV	10
Class Y Common Stock | Common Stock
Organization And Nature Of Operations [Line Items]
Common stock issued in connection with offering | shares								19,700	611,712	627,757	837,836	856,277	1,054,322
Class Y Common Stock | Distribution Reinvestment Plan
Organization And Nature Of Operations [Line Items]
Common stock issued in connection with offering | shares														200,000
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		9.3
Estimated per share NAV	$ 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	86,933	35,806	83,978
Class Z Common Stock | Distribution Reinvestment Plan
Organization And Nature Of Operations [Line Items]
Common stock issued in connection with offering | shares														9,000
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		$ 9.3						$ 10						$ 10
Series E Preferred Offering [Member]
Organization And Nature Of Operations [Line Items]
Preferred Stock, par value								0.001						0.001
Preferred Stock Offering Price								$ 10						$ 10
Series E Preferred Offering [Member] | Maximum
Organization And Nature Of Operations [Line Items]
Preferred stock, value authorized | $								$ 75,000,000						$ 75,000,000
Preferred stock, value authorized expandable | $								$ 100,000,000						$ 100,000,000
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%						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%						98.00%
SmartCentres
Organization And Nature Of Operations [Line Items]
Equity ownership percentage								50.00%						50.00%