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Related Party Transactions - Additional Information (Detail2)			12 Months Ended
	Dec. 20, 2022 USD ($)	Aug. 09, 2022 USD ($)	Dec. 31, 2023 USD ($) StorageFacility	Dec. 31, 2022 USD ($)	Aug. 29, 2022 USD ($)
SSGT III Mezzanine Loan
Related Party Transaction [Line Items]
Debt issued		$ 50,000,000
Line of credit facility, current borrowing capacity		$ 42,000,000
Commitment fee percentage		1.00%
Debt instrument, description of variable rate basis	SOFR plus 3.0%
Number of operating self storage property | StorageFacility			7
SSGT III Mezzanine Loan | Upon Achievement Of Certain Financial Conditions
Related Party Transaction [Line Items]
Debt instrument, description of variable rate basis	SOFR plus 4.0%
SSGT III Mezzanine Loan | Minimum
Related Party Transaction [Line Items]
Increased the principal borrowing amount	$ 50,000,000
SSGT III Mezzanine Loan | Maximum
Related Party Transaction [Line Items]
Increased the principal borrowing amount	$ 77,000,000
Other Income
Related Party Transaction [Line Items]
Dividend distribution received			$ 341,000	$ 315,000
SmartStop OP
Related Party Transaction [Line Items]
Investment of preferred investor					$ 5,000,000
SSGT III OP
Related Party Transaction [Line Items]
Outstanding amount			4,000,000	17,500,000
SSGT III OP | Other Income
Related Party Transaction [Line Items]
Loss related to equity interest			700,000	300,000
Dividend distribution received			$ 257,000	$ 55,000

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Loss related to equity interest.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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