Organization - Additional Information (Detail)															1 Months Ended	12 Months Ended
	Dec. 31, 2025 USD ($) OperatingSelfStorageProperty UnconsolidatedRealEstateVenture $ / shares	Sep. 04, 2025 USD ($) $ / shares shares	Aug. 07, 2025 shares	Jul. 18, 2025 USD ($)	Mar. 31, 2025 shares	Aug. 07, 2024 $ / shares shares	Nov. 01, 2023 $ / shares shares	May 01, 2023 USD ($)	Jan. 30, 2023 USD ($) $ / shares shares	Mar. 17, 2022 USD ($) shares	May 28, 2021 USD ($)	Mar. 10, 2021 USD ($) shares	Feb. 26, 2021 USD ($)	Jan. 15, 2021 USD ($) $ / shares	May 31, 2023 shares	Dec. 31, 2025 USD ($) OperatingSelfStorageProperty UnconsolidatedRealEstateVenture $ / shares shares	Dec. 31, 2024 USD ($) $ / shares shares	Dec. 31, 2023 USD ($) shares	Sep. 30, 2025 USD ($) $ / shares	May 30, 2025 $ / shares	Mar. 31, 2024 $ / shares	May 02, 2023 USD ($)
Organization And Nature Of Operations [Line Items]
Units converted | shares			0		0
Funding received from sponsor | $	$ 10,200,000
Number of operating self storage properties owned | OperatingSelfStorageProperty	24															24
Shares issuable pursuant to distribution reinvestment plan | $				$ 75,000,000									$ 20,000,000
Number of unconsolidated real estate ventures | UnconsolidatedRealEstateVenture	5															5
Advisor purchased initial investment in operating partnership | $																$ 202,000
Aggregate consideration | $																		$ 15,000,000
Preferred Stock, par value	$ 0.001													$ 0.001		$ 0.001	$ 0.001
Sale of Stock, Consideration Received on Transaction | $								$ 150,000,000
Issuance costs | $																$ 2,508,610	$ 3,634,282	$ 4,387,423
Sponsor Funding Agreement
Organization And Nature Of Operations [Line Items]
Estimated per share NAV						$ 10															$ 10
Purchase Agreement
Organization And Nature Of Operations [Line Items]
Aggregate value of shares committed to purchase | $								150,000,000
Managing Dealer Agreement
Organization And Nature Of Operations [Line Items]
Percentage of sales commissions																			6.00%
Percentage of managing dealer fees																			3.50%
Percentage of aggregate shares committed																			0.15%
Maximum aggregate value of shares committed to pay | $																			$ 550,000
Series C Units
Organization And Nature Of Operations [Line Items]
Conversion of units							$ 10
Distribution Reinvestment Plan
Organization And Nature Of Operations [Line Items]
Gross proceeds from issuance of common stock | $																$ 19,700,000
Distribution reinvestment plan termination notice period																10 days
Class A Common Stock
Organization And Nature Of Operations [Line Items]
Estimated per share NAV						$ 10
Units converted | shares						0	0
One time stock dividend							$ 0.11075
Class A Common Stock | Sponsor Funding Agreement
Organization And Nature Of Operations [Line Items]
Estimated per share NAV							10
Class A Common Stock | Common Stock
Organization And Nature Of Operations [Line Items]
Common stock issued in connection with offering | shares																		1,180,172
Class A Common Stock | Series C Units
Organization And Nature Of Operations [Line Items]
Conversion of units							10
Class A Common Stock | Distribution Reinvestment Plan
Organization And Nature Of Operations [Line Items]
Common stock issued in connection with offering | shares																200,000
Price per share							9.3
Class A Common Stock | Pubic Offering
Organization And Nature Of Operations [Line Items]
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 | shares																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]
Gross proceeds from issuance of common stock | $										$ 100,700,000
Estimated per share NAV						$ 10
Class P Common Stock | Common Stock
Organization And Nature Of Operations [Line Items]
Common stock issued in connection with offering | shares																64,865
Class P Common Stock | Series C Units
Organization And Nature Of Operations [Line Items]
Conversion of units							10
Class P Common Stock | Distribution Reinvestment Plan
Organization And Nature Of Operations [Line Items]
Common stock issued in connection with offering | shares																1,100,000
Price per share							9.3
Class P Common Stock | Private Offering | Common Stock
Organization And Nature Of Operations [Line Items]
Common stock issued in connection with offering | shares										10,600,000
Class T Common Stock
Organization And Nature Of Operations [Line Items]
Estimated per share NAV						10
One time stock dividend							0.07526
Class T Common Stock | Common Stock
Organization And Nature Of Operations [Line Items]
Common stock issued in connection with offering | shares																		1,812,471
Class T Common Stock | Series C Units
Organization And Nature Of Operations [Line Items]
Conversion of units							10
Class T Common Stock | Distribution Reinvestment Plan
Organization And Nature Of Operations [Line Items]
Common stock issued in connection with offering | shares																400,000
Price per share							9.3
Class T Common Stock | Pubic Offering
Organization And Nature Of Operations [Line Items]
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 | shares																4,800,000
Class W Common Stock
Organization And Nature Of Operations [Line Items]
Estimated per share NAV						10
One time stock dividend							0.01075
Class W Common Stock | Common Stock
Organization And Nature Of Operations [Line Items]
Common stock issued in connection with offering | shares																		418,085
Class W Common Stock | Series C Units
Organization And Nature Of Operations [Line Items]
Conversion of units							10
Class W Common Stock | Distribution Reinvestment Plan
Organization And Nature Of Operations [Line Items]
Common stock issued in connection with offering | shares																57,000
Price per share							$ 9.3
Class W Common Stock | Pubic Offering
Organization And Nature Of Operations [Line Items]
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 | shares																700,000
Series A Cumulative Redeemable Preferred Units
Organization And Nature Of Operations [Line Items]
Issuance of preferred units | shares									600,000
Series A Cumulative Redeemable Preferred Units | Preferred Unit Purchase Agreement
Organization And Nature Of Operations [Line Items]
Issuance of preferred units | shares									600,000
Preferred units, liquidation preference									$ 25
Capital contribution to operating partnership | $									$ 15,000,000
Preferred stock redemption amount | $																						$ 15,000,000
Series B Convertible Preferred Stock
Organization And Nature Of Operations [Line Items]
Common stock issued in connection with offering | shares															150,000,000
Series B Convertible Preferred Stock | Purchase Agreement
Organization And Nature Of Operations [Line Items]
Issuance costs | $								$ 1,400,000
Class Y Common Stock
Organization And Nature Of Operations [Line Items]
Estimated per share NAV						10
Reclassification of shares | shares							200,000,000
Price per share							$ 9.3
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%
Class Y Common Stock | Common Stock
Organization And Nature Of Operations [Line Items]
Common stock issued in connection with offering | shares																1,259,169	3,604,009	382,653
Class Y Common Stock | Series C Units
Organization And Nature Of Operations [Line Items]
Conversion of units							$ 10
Class Y Common Stock | Distribution Reinvestment Plan
Organization And Nature Of Operations [Line Items]
Common stock issued in connection with offering | shares																200,000
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 | shares																5,200,000
Class Z Common Stock
Organization And Nature Of Operations [Line Items]
Estimated per share NAV						$ 10
Reclassification of shares | shares							70,000,000
Price per share							$ 9.3
Class Z Common Stock | Common Stock
Organization And Nature Of Operations [Line Items]
Common stock issued in connection with offering | shares																222,050	306,593	36,559
Class Z Common Stock | Series C Units
Organization And Nature Of Operations [Line Items]
Conversion of units							10
Class Z Common Stock | Distribution Reinvestment Plan
Organization And Nature Of Operations [Line Items]
Common stock issued in connection with offering | shares																12,000
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 | shares																600,000
Series D Preferred units
Organization And Nature Of Operations [Line Items]
Issuance of preferred units | shares		400,000
Aggregate consideration | $		$ 10,000,000
Series E Preferred Offering
Organization And Nature Of Operations [Line Items]
Preferred Stock, par value																			$ 0.001
Preferred stock offering price																			$ 10
Series E Preferred Offering | Maximum
Organization And Nature Of Operations [Line Items]
Preferred stock, value authorized | $																			$ 75,000,000
Preferred stock, value authorized expandable | $																			$ 100,000,000
Series D Cumulative Redeemable Preferred Units
Organization And Nature Of Operations [Line Items]
Common stock issued in connection with offering | shares																1,400,000
Issuance of preferred units | shares		1,000,000
Preferred Stock, par value		$ 25
Preferred units, liquidation preference		$ 25
Capital contribution to operating partnership | $		$ 25,000,000
Class Y Shares and Class Z Shares | Sponsor Funding Agreement
Organization And Nature Of Operations [Line Items]
Price per share	$ 10						$ 9.3									$ 10	$ 10			$ 10
Percentage of organization and offering expenses							1.00%
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
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	2.00%															2.00%
Advisor purchased a limited partnership interest in Operating Partnership, number of partnership units | shares												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	98.00%															98.00%
SmartCentres
Organization And Nature Of Operations [Line Items]
Equity ownership percentage	50.00%															50.00%