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v3.23.1

Related Party Transactions - Additional Information (Detail) |  |  |  |  |  |  |  | 3 Months Ended |  |  |  |  |
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Jan. 30, 2023 USD ($) shares | Dec. 20, 2022 USD ($) | Oct. 25, 2022 | Aug. 09, 2022 USD ($) | Jun. 01, 2022 USD ($) StorageFacility StorageProperty | Mar. 01, 2022 | Dec. 30, 2021 StorageFacility | Mar. 31, 2023 USD ($) StorageFacility shares | Jun. 30, 2022 USD ($) | Mar. 31, 2022 USD ($) shares | Dec. 31, 2022 USD ($) | Aug. 29, 2022 USD ($) | May 01, 2022 USD ($) | Dec. 31, 2021 USD ($) | Mar. 10, 2021 USD ($)
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum dealer manager commission fee percentage of proceeds from Primary Offering |  |  |  |  |  |  |  | 3.00% |  |  |  |  |  |  |
Change in deferred tax liability |  |  |  |  |  |  |  | $ 120,287 |  | $ 241,588 |  |  |  |  |
Number of self storage facilities | StorageFacility |  |  |  |  |  |  | 2 | 153 |  |  |  |  |  |  |
Managed REIT Platform Expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reimbursements payable to SAM under the Administrative Services Agreement |  |  |  |  |  |  |  | $ 65,000 |  | 16,000 |  |  |  |  |
Managed REIT Platform Revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of revenue from tenant protection programs |  |  |  |  |  |  |  | 0.10% |  |  |  |  |  |  |
Receivables due from related parties |  |  |  |  |  |  |  | $ 6,000,000.0 |  |  | $ 2,000,000.0 |  |  |  |
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 |  |  |  |  |  |  |  |  |  |
Number of self storage facilities | StorageFacility |  |  |  |  | 10 |  |  |  |  |  |  |  |  |  |
Number of operating self storage property | StorageProperty |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |
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% |  |  |  |  |  |  |
Managed REIT |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage |  |  |  |  |  |  |  | 0.10% |  |  |  |  |  |  |
TRS subsidiary | Managed REIT Platform Revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of revenue from tenant protection programs |  |  |  |  |  |  |  | 99.90% |  |  |  |  |  |  |
TRS subsidiary | Managed REIT |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage |  |  |  |  |  |  |  | 99.90% |  |  |  |  |  |  |
Pacific Oak Holding Group |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable interest entity non-voting ownership percentage |  |  |  |  |  | 10.00% |  |  |  |  |  |  |  |  |
SmartStop Asset Management | Strategic Transfer Agent Services, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of membership interest |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |
Transfer Agent Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Transfer agent agreement term |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |  |
Transfer agent renewal agreement term |  |  |  |  |  |  |  | 1 year |  |  |  |  |  |  |
Transfer agent agreement termination description |  |  |  |  |  |  |  | The initial term of the transfer agent agreement was three years, which term is automatically renewed for one year successive terms, but either party may terminate the transfer agent agreement upon 90 days’ prior written notice. In the event that we terminate the transfer agent agreement, other than for cause, we will pay our transfer agent all amounts that would have otherwise accrued during the remaining term of the transfer agent agreement; provided, however, that when calculating the remaining months in the term for such purposes, such term is deemed to be a 12 month period starting from the date of the most recent annual anniversary date. |  |  |  |  |  |  |
SSGT II Advisor |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Monthly asset management fee |  |  |  |  |  |  |  | 0.1042% |  |  |  |  |  |  |
Monthly asset management fee one twelfth of less than one percentage of average invested assets |  |  |  |  |  |  |  | one-twelfth of 1.25% |  |  |  |  |  |  |
SST VI Advisory Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rate of acquisition fees of purchase price of contract |  |  |  |  |  |  |  | 1.00% |  |  |  |  |  |  |
Monthly asset management fee |  |  |  |  |  |  |  | 0.0625% |  |  |  |  |  |  |
Reimbursable Costs |  |  |  |  |  |  |  | $ 31,000 |  | $ 0 |  |  |  |  |
Monthly asset management fee one twelfth of less than one percentage of average invested assets |  |  |  |  |  |  |  | one-twelfth of 0.75% |  |  |  |  |  |  |
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 | shares |  |  |  |  |  |  |  | 23,000 |  | 0 |  |  |  |  |
SST VI Advisory Agreement | Pacific Oak Holding Group |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable interest entity non-voting ownership percentage |  |  |  |  |  | 10.00% |  |  |  |  |  |  |  |  |
SSGT III Advisory Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rate of acquisition fees of purchase price of contract |  |  |  |  |  |  |  | 1.00% |  |  |  |  |  |  |
Monthly asset management fee |  |  |  |  |  |  |  | 0.0625% |  |  |  |  |  |  |
Monthly asset management fee one twelfth of less than one percentage of average invested assets |  |  |  |  |  |  |  | one-twelfth of 0.75 |  |  |  |  |  |  |
SSGT III Advisory Agreement | Disposition Fee |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rate of disposition fee of contract sales price |  |  |  |  |  |  |  | 1.50% |  |  |  |  |  |  |
SSGT III Advisory Agreement | Disposition Fee | Pacific Oak Holding Group |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rate of disposition fee of contract sales price |  |  |  |  |  |  |  | 10.00% |  |  |  |  |  |  |
Administrative Services Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Receivables due from related parties |  |  |  |  |  |  |  | $ 15,000 |  |  | 15,000 |  |  |  |
Administrative Services Agreement | Managed REIT Platform Expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Administrative service fees |  |  |  |  |  |  |  | 40,000 |  | $ 140,000 |  |  |  |  |
SST VI OP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase units of limited partnership interest | shares | 600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase commitment amount | $ 15,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of investment fee due upon closing | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description of preferred investor distributions | SmartStop, through its subsidiary, will receive distributions, payable monthly in arrears, at a rate of 7.0% per annum from the date of issuance until the second anniversary of the date of issuance, 8.0% per annum commencing thereafter until the third anniversary of the date of issuance, 9.0% per annum commencing thereafter until the fourth anniversary of the date of issuance, and 10% per annum thereafter, payable monthly and calculated on an actual/360 basis. The proceeds of the Preferred Investment may be used by SST VI OP to finance self-storage storage acquisition, development, and improvement activities, and working capital or other general partnership purposes. |  |  |  |  |  |  |  |  |  |  |  |  |  |
SST VI OP | Other Income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss related to equity interest |  |  |  |  |  |  |  | 200,000 |  |  |  |  |  |  |
Dividend distribution received |  |  |  |  |  |  |  | $ 84,000 |  |  |  |  |  |  |
SST VI OP | Up to Second Anniversary |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rate of distributions payable monthly in arrears | 7.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
SST VI OP | Up to Third Anniversary |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rate of distributions payable monthly in arrears | 8.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
SST VI OP | Up to Fourth Anniversary |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rate of distributions payable monthly in arrears | 9.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
SST VI OP | Investment Thereafter |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rate of distributions payable monthly in arrears | 10.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property Management Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Write-off of carrying value related to intangible asset |  |  |  |  | $ 600,000 |  |  |  |  |  |  |  |  |  |
Percentage of fee of former external property managers |  |  |  |  |  |  |  | 6.00% |  |  |  |  |  |  |
Construction management fee |  |  |  |  |  |  |  | 5.00% |  |  |  |  |  |  |
Cost of construction or capital improvement work |  |  |  |  |  |  |  | $ 10,000 |  |  |  |  |  |  |
One time fee for former external property managers |  |  |  |  |  |  |  | 3,750 |  |  |  |  |  |  |
Property Management Agreement | Other Income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Change in deferred tax liability |  |  |  |  |  |  |  |  | $ 200,000 |  |  |  |  |  |
Property Management Agreement | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Our former external property management fee |  |  |  |  |  |  |  | 3,000 |  |  |  |  |  |  |
SmartStop OP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment of preferred investor |  |  |  |  |  |  |  |  |  |  |  | $ 5,000,000.0 |  |  |
Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,000,000.0
SSGT III OP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding amount |  |  |  |  |  |  |  | 0 |  |  | 17,500,000 |  |  |  |
SSGT III OP | Other Income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss related to equity interest |  |  |  |  |  |  |  | 200,000 |  |  |  |  |  |  |
Dividend distribution received |  |  |  |  |  |  |  | $ 54,000 |  |  |  |  |  |  |
SST VI Mezzanine Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of operating self storage property | StorageFacility |  |  |  |  |  |  |  | 17 |  |  |  |  |  |  |
Commitment Fee Percentage |  |  |  |  |  |  | 1.00% |  |  |  |  |  |  |  |
Debt instrument, description of variable rate basis |  |  |  |  |  |  | LIBOR plus 3.0% |  |  |  |  |  |  |  |
SST VI Mezzanine Loan | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increased the principal borrowing amount |  | $ 45,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
SST VI Mezzanine Loan | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issued |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 45,000,000 |
Increased the principal borrowing amount |  | $ 55,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
SST VI Mezzanine Loan | Pacific Oak Holding Group |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, description of variable rate basis |  | SOFR plus 3.0% |  |  |  |  |  |  |  |  |  |  |  |  |
SST VI Mezzanine Loan | SST VI OP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding amount |  |  |  |  |  |  |  | $ 50,000,000.0 |  |  | $ 35,000,000.0 |  |  |  |
SSGT III Mezzanine Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of operating self storage property | StorageFacility |  |  |  |  |  |  |  | 4 |  |  |  |  |  |  |
Debt issued |  |  |  | $ 50,000,000.0 |  |  |  |  |  |  |  |  |  |  |
Commitment Fee Percentage |  |  |  | 1.00% |  |  |  |  |  |  |  |  |  |  |
Debt instrument, description of variable rate basis |  | SOFR plus 3.0% |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, current borrowing capacity |  |  |  | $ 42,000,000.0 |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |
Upon Achievement Of Certain Financial Conditions | SSGT III Mezzanine Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, description of variable rate basis |  | SOFR plus 4.0% |  |  |  |  |  |  |  |  |  |  |  |  |

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