Organization - Additional Information (Detail)						3 Months Ended
	Jan. 30, 2023 USD ($) $ / shares shares	May 28, 2021 USD ($)	Mar. 10, 2021 USD ($) shares	Feb. 26, 2021 USD ($)	Jan. 15, 2021 USD ($) $ / shares shares	Mar. 31, 2023 USD ($) UnconsolidatedRealEstateVenture OperatingSelfStorageProperty Employee $ / shares shares	Mar. 31, 2022 shares	Dec. 31, 2022 $ / 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
Number of operating self storage properties owned | OperatingSelfStorageProperty						17
Percentage of non-voting economic interest owned by affiliates						10.00%
Number of unconsolidated real estate ventures | UnconsolidatedRealEstateVenture						3
Advisor purchased initial investment in operating partnership | $						$ 202,000
Distribution Reinvestment Plan
Organization And Nature Of Operations [Line Items]
Gross proceeds from issuance of common stock | $						$ 3,800,000
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						300,000,000		300,000,000
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						294,558
Class A Common Stock | Distribution Reinvestment Plan
Organization And Nature Of Operations [Line Items]
Common stock issued in connection with offering						20,300
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
Gross proceeds from issuance of common stock | $						$ 21,100,000
Common stock issued in connection with offering						2,000,000.0
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 | Common Stock
Organization And Nature Of Operations [Line Items]
Common stock issued in connection with offering							5,430,060
Class P Common Stock | Distribution Reinvestment Plan
Organization And Nature Of Operations [Line Items]
Common stock issued in connection with offering						300,000
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
Organization And Nature Of Operations [Line Items]
Gross proceeds from issuance of common stock | $						$ 100,700,000
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						300,000,000		300,000,000
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						673,565
Class T Common Stock | Distribution Reinvestment Plan
Organization And Nature Of Operations [Line Items]
Common stock issued in connection with offering						33,900
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
Gross proceeds from issuance of common stock | $						$ 36,700,000
Common stock issued in connection with offering						3,700,000
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						140,638
Class W Common Stock | Distribution Reinvestment Plan
Organization And Nature Of Operations [Line Items]
Common stock issued in connection with offering						4,100
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
Gross proceeds from issuance of common stock | $						$ 3,600,000
Common stock issued in connection with offering						400,000
Series A Cumulative Redeemable Preferred Units
Organization And Nature Of Operations [Line Items]
Issuance of preferred units	600,000
Series A Cumulative Redeemable Preferred Units | Preferred Unit Purchase Agreement
Organization And Nature Of Operations [Line Items]
Issuance of preferred units	600,000
Preferred units, liquidation preference | $ / shares	$ 25.00
Capital contribution to operating partnership | $	$ 15,000,000
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
Advisor purchased initial investment in operating partnership | $					$ 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 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 [Member]
Organization And Nature Of Operations [Line Items]
Equity ownership percentage						3.10%
Advisor purchased a limited partnership interest in Operating Partnership, number of partnership units			549,451
Initial capital contribution | $			$ 5,000,000.0
Strategic Storage Operating Partnership VI, L.P.
Organization And Nature Of Operations [Line Items]
Equity ownership percentage						96.90%
SmartCentres
Organization And Nature Of Operations [Line Items]
Equity ownership percentage						50.00%
SmartStop REIT Advisors, LLC | Strategic Storage Advisor IV, LLC
Organization And Nature Of Operations [Line Items]
Percentage of economic interests owned by sponsor						90.00%
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%