Organization - Additional Information (Detail)							12 Months Ended
	Mar. 17, 2023 shares	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	Dec. 31, 2022 USD ($) OperatingSelfStorageProperty UnconsolidatedRealEstateVenture Employee $ / shares shares	Dec. 31, 2021 $ / 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							15
Percentage of non-voting economic interest owned by affiliates							10.00%
Number of unconsolidated real estate ventures | UnconsolidatedRealEstateVenture							2
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 | $							$ 2,900,000
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 | Subsequent Event
Organization And Nature Of Operations [Line Items]
Common stock issued in connection with offering	2,000,000.0
Class A Common Stock | Common Stock
Organization And Nature Of Operations [Line Items]
Common stock issued in connection with offering							1,755,190
Class A Common Stock | Distribution Reinvestment Plan
Organization And Nature Of Operations [Line Items]
Common stock issued in connection with offering							10,000
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 | $							$ 18,100,000
Common stock issued in connection with offering							1,800,000
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 | Subsequent Event
Organization And Nature Of Operations [Line Items]
Common stock issued in connection with offering	10,900,000
Class P Common Stock | Common Stock
Organization And Nature Of Operations [Line Items]
Common stock issued in connection with offering							5,539,950	5,026,902
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 | Subsequent Event
Organization And Nature Of Operations [Line Items]
Common stock issued in connection with offering	3,600,000
Class T Common Stock | Common Stock
Organization And Nature Of Operations [Line Items]
Common stock issued in connection with offering							2,998,808
Class T Common Stock | Distribution Reinvestment Plan
Organization And Nature Of Operations [Line Items]
Common stock issued in connection with offering							17,000
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
Gross proceeds from issuance of common stock | $							$ 30,000,000.0
Common stock issued in connection with offering							3,000,000.0
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 | Subsequent Event
Organization And Nature Of Operations [Line Items]
Common stock issued in connection with offering	400,000
Class W Common Stock | Common Stock
Organization And Nature Of Operations [Line Items]
Common stock issued in connection with offering							246,436
Class W Common Stock | Distribution Reinvestment Plan
Organization And Nature Of Operations [Line Items]
Common stock issued in connection with offering							2,000
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 | $							$ 2,300,000
Common stock issued in connection with offering							200,000
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
Preferred Investor | Series A Cumulative Redeemable Preferred Units | Subsequent Event
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
Smartstop OP L P [Member]
Organization And Nature Of Operations [Line Items]
Equity ownership percentage							3.30%
Advisor purchased a limited partnership interest in Operating Partnership, number of partnership units				549,451
Initial capital contribution | $				$ 5.0
Strategic Storage Operating Partnership VI, L.P.
Organization And Nature Of Operations [Line Items]
Equity ownership percentage							96.70%
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%