Organization - Additional Information (Detail1)					6 Months Ended
	Jul. 18, 2025 USD ($)	May 28, 2021 USD ($) shares	Feb. 26, 2021 USD ($)	Jan. 15, 2021 USD ($) $ / shares shares	Jun. 30, 2025 Employee $ / shares shares	Dec. 31, 2024 $ / shares shares
Organization And Nature Of Operations [Line Items]
Date of formation of company					Oct. 14, 2020
Number of employees | Employee					0
Preferred Stock, shares authorized				200,000,000	200,000,000	200,000,000
Preferred Stock, par value | $ / shares				$ 0.001	$ 0.001	$ 0.001
Shares issuable pursuant to distribution reinvestment plan | $			$ 20,000,000
Subsequent Event
Organization And Nature Of Operations [Line Items]
Shares issuable pursuant to distribution reinvestment plan | $	$ 75,000,000
Maximum
Organization And Nature Of Operations [Line Items]
Common stock, value authorized | $			$ 200,000,000
Class A Common Stock
Organization And Nature Of Operations [Line Items]
Common Stock, shares authorized					230,000,000	230,000,000
Common Stock, par value | $ / shares					$ 0.001	$ 0.001
Class A Common Stock | Primary Offering | Maximum
Organization And Nature Of Operations [Line Items]
Common stock, value authorized | $		$ 1,000,000,000
Class A Common Stock | Pubic Offering
Organization And Nature Of Operations [Line Items]
Common Stock, shares authorized		300,000,000
Shares issuable pursuant to distribution reinvestment plan | $		$ 95,000,000
Class P Common Stock
Organization And Nature Of Operations [Line Items]
Common Stock, shares authorized					30,000,000	30,000,000
Common Stock, par value | $ / shares					$ 0.001	$ 0.001
Class P Common Stock | Pubic Offering
Organization And Nature Of Operations [Line Items]
Common Stock, shares authorized		30,000,000
Class T Common Stock
Organization And Nature Of Operations [Line Items]
Common Stock, shares authorized					100,000,000	100,000,000
Common Stock, par value | $ / shares					$ 0.001	$ 0.001
Class T Common Stock | Primary Offering | Maximum
Organization And Nature Of Operations [Line Items]
Common stock, value authorized | $		$ 1,000,000,000
Class T Common Stock | Pubic Offering
Organization And Nature Of Operations [Line Items]
Common Stock, shares authorized		300,000,000
Shares issuable pursuant to distribution reinvestment plan | $		$ 95,000,000
Class W Common Stock
Organization And Nature Of Operations [Line Items]
Common Stock, shares authorized					70,000,000	70,000,000
Common Stock, par value | $ / shares					$ 0.001	$ 0.001
Class W Common Stock | Primary Offering | Maximum
Organization And Nature Of Operations [Line Items]
Common stock, value authorized | $		$ 1,000,000,000
Class W Common Stock | Pubic Offering
Organization And Nature Of Operations [Line Items]
Common Stock, shares authorized		70,000,000
Shares issuable pursuant to distribution reinvestment plan | $		$ 95,000,000
Articles of Incorporation
Organization And Nature Of Operations [Line Items]
Common Stock, shares authorized				30,000
Common Stock, par value | $ / shares				$ 0.001
Articles of Amendment and Restatement
Organization And Nature Of Operations [Line Items]
Common Stock, shares authorized				700,000,000
Common Stock, par value | $ / shares				$ 0.001
Strategic Storage Advisor IV, LLC
Organization And Nature Of Operations [Line Items]
Sale of common shares to advisor | $				$ 1,000
Strategic Storage Advisor IV, LLC | Class A Common Stock
Organization And Nature Of Operations [Line Items]
Number of shares sold to advisor				110
SmartStop REIT Advisors, LLC | Strategic Storage Advisor IV, LLC
Organization And Nature Of Operations [Line Items]
Percentage of economic interests owned by sponsor					100.00%
Percentage of voting membership interests owned by sponsor					100.00%
SmartStop REIT Advisors, LLC | Strategic Storage Property Management VI, LLC
Organization And Nature Of Operations [Line Items]
Percentage of Property Management owned by sponsor					100.00%