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Related Party Transactions - Additional Information (Detail1) - USD ($) |  |  |  |  |  |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 01, 2024 | Nov. 01, 2023 | Oct. 17, 2023 | Oct. 25, 2022 | Jun. 01, 2022 | Mar. 01, 2022 | Mar. 17, 2021 | Dec. 31, 2023 | Dec. 31, 2022 | May 02, 2023 | May 01, 2022
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain resulting from acquisition of unconsolidated affiliates |  |  |  |  |  |  |  |  | $ 16,101,237 |  |
Managed REIT Platform Expenses |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Reimbursements payable to SAM under the Administrative Services Agreement |  |  |  |  |  |  |  | $ 500,000 | 300,000 |  |
Managed REIT Platform Revenue |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of revenue from tenant protection programs |  |  |  |  |  |  |  | 0.10% |  |  |
SSGT II Merger Agreement |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Subordinated distribution value |  |  |  |  |  |  |  |  |  |  | $ 16,100,000
Gain resulting from acquisition of unconsolidated affiliates |  |  |  |  | $ 16,100,000 |  |  |  |  |  |
Write-off of carrying value related to intangible asset |  |  |  |  | 1,400,000 |  |  |  |  |  |
Change in deferred tax liability |  |  |  |  | 300,000 |  |  |  |  |  |
TRS Subsidiary | Managed REIT Platform Revenue |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of revenue from tenant protection programs |  |  |  |  |  |  |  | 99.90% |  |  |
Pacific Oak Holding Group |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Variable interest entity non-voting ownership percentage |  |  |  |  |  |  |  | 10.00% |  |  |
Managed REIT |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage |  |  |  |  |  |  |  | 0.10% |  |  |
Managed REIT | TRS Subsidiary |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage |  |  |  |  |  |  |  | 99.90% |  |  |
Class A Common stock |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sale commission fees percentage of proceed from Primary Offering |  |  |  |  |  |  |  | 7.00% |  |  |
Class T Common stock |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sale commission fees percentage of proceed from Primary Offering |  |  |  |  |  |  |  | 2.00% |  |  |
Related Party | Managed REIT Platform Revenue |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Receivables due from related parties |  |  |  |  |  |  |  | $ 6,500,000 | $ 2,000,000 |  |
SmartStop Asset Management | Strategic Transfer Agent Services, LLC |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of membership interest |  |  |  |  |  |  |  | 100.00% |  |  |
SST IV Advisor |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Write-off of carrying value related to intangible asset |  |  |  |  |  |  | $ 5,300,000 |  |  |  |
SST VI |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Public offering extended expiry date |  | Sep. 12, 2025 |  |  |  |  |  |  |  |  |
Offering price |  | $ 9.3 |  |  |  |  |  |  |  |  |
SST VI | Subsequent Event |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Public offering extended expiry date | Mar. 17, 2025 |  |  |  |  |  |  |  |  |  |
SST VI | Class A Common stock |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Offering price |  | $ 10 |  |  |  |  |  |  |  |  |
SST VI Advisory Agreement | Pacific Oak Holding Group |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Variable interest entity non-voting ownership percentage |  |  |  |  |  | 10.00% |  |  |  |  |
SST VI Advisory Agreement | Class W |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of offering cost without reimbursement |  |  |  | 1.50% |  |  |  | 1.00% |  |  |
Shares sold in public offering |  |  |  |  |  |  |  | 59,000 | 11,000 |  |
SST VI Advisory Agreement | Class Z |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of offering cost without reimbursement |  |  | 1.50% |  |  |  |  |  |  |  |
Shares sold in public offering |  |  |  |  |  |  |  | 5,000 |  |  |
Administrative Services Agreement |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Receivables due from related parties |  |  |  |  |  |  |  |  | $ 15,000 |  |
Administrative Services Agreement | Managed REIT Platform Expenses |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Administrative service fees |  |  |  |  |  |  |  | $ 700,000 | $ 700,000 |  |
SST VI OP | Series A Convertible Preferred Stock |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Preferred stock shares redeemed |  |  |  |  |  |  |  |  |  | 600,000 |
Interest payable |  |  |  |  |  |  |  |  |  | $ 15,100,000 |
Property Management Agreement |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Write-off of carrying value related to intangible asset |  |  |  |  | $ 600,000 |  | $ 1,900,000 |  |  |  |

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