Organization - Additional Information (Detail1)						12 Months Ended
	Jul. 18, 2025 USD ($)	Mar. 17, 2022 USD ($) shares	May 28, 2021 USD ($) shares	Feb. 26, 2021 USD ($)	Jan. 15, 2021 USD ($) $ / shares shares	Dec. 31, 2025 USD ($) Employee $ / shares shares	Dec. 31, 2024 $ / shares shares	Dec. 31, 2023 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 | $	$ 75,000,000			$ 20,000,000
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 | Common Stock
Organization And Nature Of Operations [Line Items]
Common stock issued in connection with offering								1,180,172
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 A Common Stock | Pubic Offering | Common Stock
Organization And Nature Of Operations [Line Items]
Common stock issued in connection with offering						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]
Common Stock, shares authorized						30,000,000	30,000,000
Common Stock, par value | $ / shares						$ 0.001	$ 0.001
Gross proceeds from issuance of common stock | $		$ 100,700,000
Class P Common Stock | Common Stock
Organization And Nature Of Operations [Line Items]
Common stock issued in connection with offering						64,865
Class P Common Stock | Pubic Offering
Organization And Nature Of Operations [Line Items]
Common Stock, shares authorized			30,000,000
Class P Common Stock | Private Offering | Common Stock
Organization And Nature Of Operations [Line Items]
Common stock issued in connection with offering		10,600,000
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 | Common Stock
Organization And Nature Of Operations [Line Items]
Common stock issued in connection with offering								1,812,471
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 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						4,800,000
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 | Common Stock
Organization And Nature Of Operations [Line Items]
Common stock issued in connection with offering								418,085
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
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						700,000
Class Y Common Stock
Organization And Nature Of Operations [Line Items]
Common Stock, shares authorized						200,000,000	200,000,000
Common Stock, par value | $ / shares						$ 0.001	$ 0.001
Class Y Common Stock | Common Stock
Organization And Nature Of Operations [Line Items]
Common stock issued in connection with offering						1,259,169	3,604,009	382,653
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						5,200,000
Class Z 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 Z Common Stock | Common Stock
Organization And Nature Of Operations [Line Items]
Common stock issued in connection with offering						222,050	306,593	36,559
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						600,000
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%
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%