Organization - Additional Information (Detail)									3 Months Ended						9 Months Ended
	Nov. 06, 2023 shares	Nov. 01, 2023 $ / shares shares	May 01, 2023 USD ($)	Jan. 30, 2023 USD ($) $ / shares shares	May 28, 2021 USD ($)	Mar. 10, 2021 USD ($) shares	Feb. 26, 2021 USD ($)	Jan. 15, 2021 USD ($) $ / shares shares	Sep. 30, 2023 Employee OperatingSelfStorageProperty UnconsolidatedRealEstateVenture $ / shares shares	Jun. 30, 2023 shares	Mar. 31, 2023 shares	Sep. 30, 2022 shares	Jun. 30, 2022 shares	Mar. 31, 2022 shares	Sep. 30, 2023 USD ($) Employee OperatingSelfStorageProperty UnconsolidatedRealEstateVenture $ / shares shares	Sep. 30, 2022 USD ($)	May 02, 2023 USD ($)	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						0
Preferred Stock, shares authorized								200,000,000	200,000,000						200,000,000			200,000,000
Preferred Stock, par value | $ / shares								$ 0.001	$ 0.001						$ 0.001			$ 0.001
Shares issuable pursuant to distribution reinvestment plan | $							$ 20,000,000
Number of operating self storage properties owned | OperatingSelfStorageProperty									24						24
Percentage of non-voting economic interest owned by affiliates															10.00%
Number of unconsolidated real estate ventures | UnconsolidatedRealEstateVenture									3						3
Advisor purchased initial investment in operating partnership | $															$ 202,000
Sale of Stock, Consideration Received on Transaction | $			$ 150,000,000
Issuance costs | $															$ 2,989,811	$ 7,986,801
Purchase Agreement
Organization And Nature Of Operations [Line Items]
Aggregate value of shares committed to purchase | $			150,000,000
Distribution Reinvestment Plan
Organization And Nature Of Operations [Line Items]
Percentage of current offering price of shares in primary offering as purchase price per share															95.00%
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			300,000,000
Common Stock, par value | $ / shares									$ 0.001						$ 0.001			$ 0.001
One time stock dividend | $ / shares		$ 0.11075
Class A Common Stock | Common Stock
Organization And Nature Of Operations [Line Items]
Common stock issued in connection with offering									179,988	270,715	294,558	637,805	572,182
Class A Common Stock | Distribution Reinvestment Plan
Organization And Nature Of Operations [Line Items]
Common stock issued in connection with offering															47,000
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
Common stock issued in connection with offering															2,500,000
Class A Common Stock | Private Offering
Organization And Nature Of Operations [Line Items]
Gross proceeds from issuance of common stock | $															$ 25,800,000
Class P Common Stock
Organization And Nature Of Operations [Line Items]
Common Stock, shares authorized									30,000,000						30,000,000			30,000,000
Common Stock, par value | $ / shares									$ 0.001						$ 0.001			$ 0.001
Class P Common Stock | Common Stock
Organization And Nature Of Operations [Line Items]
Common stock issued in connection with offering													109,890	5,430,060
Class P Common Stock | Distribution Reinvestment Plan
Organization And Nature Of Operations [Line Items]
Common stock issued in connection with offering															500,000
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			300,000,000
Common Stock, par value | $ / shares									$ 0.001						$ 0.001			$ 0.001
One time stock dividend | $ / shares		0.07526
Class T Common Stock | Common Stock
Organization And Nature Of Operations [Line Items]
Common stock issued in connection with offering									442,210	481,581	673,565	1,521,783	668,360
Class T Common Stock | Distribution Reinvestment Plan
Organization And Nature Of Operations [Line Items]
Common stock issued in connection with offering															83,000
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
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 | $															$ 46,000,000
Class T Common Stock | Private Offering | Common Stock
Organization And Nature Of Operations [Line Items]
Common stock issued in connection with offering															4,600,000
Class W Common Stock
Organization And Nature Of Operations [Line Items]
Common Stock, shares authorized									70,000,000						70,000,000			70,000,000
Common Stock, par value | $ / shares									$ 0.001						$ 0.001			$ 0.001
One time stock dividend | $ / shares		0.01075
Class W Common Stock | Common Stock
Organization And Nature Of Operations [Line Items]
Common stock issued in connection with offering									59,574	126,596	140,638	78,617	86,436
Class W Common Stock | Distribution Reinvestment Plan
Organization And Nature Of Operations [Line Items]
Gross proceeds from issuance of common stock | $															$ 6,100,000
Common stock issued in connection with offering															11,000
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
Class W Common Stock | Private Offering
Organization And Nature Of Operations [Line Items]
Gross proceeds from issuance of common stock | $															$ 5,400,000
Class W Common Stock | Private Offering | Common Stock
Organization And Nature Of Operations [Line Items]
Common stock issued in connection with offering															600,000
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
Capital contribution to operating partnership | $				$ 15,000,000
Preferred stock redemption amount | $																	$ 15,000,000
Series B Convertible Preferred Stock | Purchase Agreement
Organization And Nature Of Operations [Line Items]
Issuance costs | $			$ 1,400,000
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
Organization And Nature Of Operations [Line Items]
Equity ownership percentage									3.00%						3.00%
Advisor purchased a limited partnership interest in Operating Partnership, number of partnership units						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									97.00%						97.00%
SmartCentres
Organization And Nature Of Operations [Line Items]
Equity ownership percentage									50.00%						50.00%
Subsequent Event | Class A Common Stock
Organization And Nature Of Operations [Line Items]
Common stock issued in connection with offering	2,800,000
Price per share | $ / shares		9.3
Net asset value per share | $ / shares		10
Subsequent Event | Class P Common Stock
Organization And Nature Of Operations [Line Items]
Common stock issued in connection with offering	11,100,000
Price per share | $ / shares		9.3
Net asset value per share | $ / shares		10
Subsequent Event | Class T Common Stock
Organization And Nature Of Operations [Line Items]
Common stock issued in connection with offering	4,800,000
Price per share | $ / shares		9.3
Net asset value per share | $ / shares		10
Subsequent Event | Class W Common Stock
Organization And Nature Of Operations [Line Items]
Common stock issued in connection with offering	600,000
Price per share | $ / shares		9.3
Net asset value per share | $ / shares		$ 10
Subsequent Event | Class Y Common Stock
Organization And Nature Of Operations [Line Items]
Common stock issued in connection with offering	0
Reclassification of shares		200,000,000
Price per share | $ / shares		$ 9.3
Net asset value per share | $ / shares		$ 10
Subsequent Event | Class Y Common Stock | Sponsor Funding Agreement
Organization And Nature Of Operations [Line Items]
Percentage of upfront sales commission		3.00%
Percentage of upfront dealer manager fee		3.00%
Subsequent Event | Class Z Common Stock
Organization And Nature Of Operations [Line Items]
Common stock issued in connection with offering	0
Reclassification of shares		70,000,000
Price per share | $ / shares		$ 9.3
Net asset value per share | $ / shares		$ 10
Subsequent Event | Class Y Shares and Class Z Shares | Sponsor Funding Agreement
Organization And Nature Of Operations [Line Items]
Percentage of current offering price of shares in primary offering as purchase price per share		9.30%
Price per share | $ / shares		$ 9.3
Percentage of organization and offering expenses		1.00%
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%						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%