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Subsequent Events - Additional Information (Details) $ / shares in Units, $ in Millions, $ in Millions |  |  | 1 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Nov. 03, 2023 CAD ($) | Jan. 30, 2023 USD ($) $ / shares shares | Feb. 28, 2023 shares | Feb. 28, 2022 | Sep. 30, 2023 shares | Dec. 31, 2022 shares | Dec. 31, 2021 shares | Nov. 01, 2023 USD ($) $ / shares
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Percentage of investment fee due upon closing |  | 1.00% |  |  |  |  |  |
Performance Based Awards | LTIPs |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Issuance of equity awards |  |  |  |  | 271,199 | 113,429 | 148,387 |
Percentage of established target performance criteria |  |  |  |  | 200.00% | 200.00% |  |
Performance Based Awards | LTIPs | Maximum |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Percentage of established target performance criteria |  |  |  |  | 200.00% | 200.00% |  |
Time Based Awards | LTIPs |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Issuance of equity awards |  |  |  |  | 315,915 | 181,664 | 222,581 |
Executive Officers | Performance Based Awards | LTIPs |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Issuance of equity awards |  |  | 271,199 |  |  |  |  |
Executive Officers | Time Based Awards | LTIPs |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Issuance of equity awards |  |  | 275,308 |  |  |  |  |
Vesting period |  |  |  | 4 years |  |  |  |
S S T V I O P [Member] |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Purchase units of limited partnership interest |  | 600,000 |  |  |  |  |  |
Purchase commitment amount | $ |  | $ 15 |  |  |  |  |  |
Description of preferred investor distributions |  |  |  |  | SmartStop, through its subsidiary, received 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. |  |  |
Up to second anniversary | S S T V I O P [Member] |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Rate of distributions payable monthly in arrears |  | 7.00% |  |  |  |  |  |
Up to third anniversary | S S T V I O P [Member] |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Rate of distributions payable monthly in arrears |  | 8.00% |  |  |  |  |  |
Up to fourth anniversary | S S T V I O P [Member] |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Rate of distributions payable monthly in arrears |  | 9.00% |  |  |  |  |  |
Investment Thereafter | S S T V I O P [Member] |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Rate of distributions payable monthly in arrears |  | 10.00% |  |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Upfront Sales Commission |  |  |  |  |  |  |  | 3.00%
Upfront Dealer Manager |  |  |  |  |  |  |  | 3.00%
Organization and Offering Expense |  |  |  |  |  |  |  | 1.00%
Subsequent Event | Executive Officers | Performance Based Awards | LTIPs |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Issuance of equity awards |  |  | 271,199 |  |  |  |  |
Percentage of established target performance criteria |  |  | 200.00% |  |  |  |  |
Vesting period |  |  | 3 years |  |  |  |  |
Subsequent Event | Executive Officers | Performance Based Awards | LTIPs | Maximum |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Percentage of established target performance criteria |  |  | 200.00% |  |  |  |  |
Subsequent Event | Executive Officers | Performance Based Awards | LTIPs | Minimum |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Percentage of established target performance criteria |  |  | 0.00% |  |  |  |  |
Subsequent Event | Executive Officers | Time Based Awards | LTIPs |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Issuance of equity awards |  |  | 275,308 |  |  |  |  |
Vesting period |  |  | 4 years |  |  |  |  |
Subsequent Event | S S T V I O P [Member] |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Percentage of investment fee due upon closing |  | 1.00% |  |  |  |  |  |
Purchase units of limited partnership interest |  | 600,000 |  |  |  |  |  |
Purchase commitment amount | $ |  | $ 15 |  |  |  |  |  |
Description of preferred investor distributions |  | The Preferred Investor 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 storage acquisition, development, and improvement activities, and working capital or other general partnership purposes. Each Preferred Unit has a liquidation preference of $25.00, plus all accumulated and unpaid distributions. |  |  |  |  |  |
Preferred stock, liquidation preference per unit | $ / shares |  | $ 25 |  |  |  |  |  |
Subsequent Event | SST VI |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Offering price | $ / shares |  |  |  |  |  |  |  | $ 9.3
Maximum Offering | $ |  |  |  |  |  |  |  | $ 1,000
Maximum Commitment | $ |  |  |  |  |  |  |  | $ 70
Interest Rate |  |  |  |  |  |  |  | 7.00%
Subsequent Event | SST VI | Class A units |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Offering price | $ / shares |  |  |  |  |  |  |  | $ 10
Subsequent Event | RBC JV Term Loan |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Term loan | $ | $ 70.0 |  |  |  |  |  |  |
Loan amount | $ | $ 68.7 |  |  |  |  |  |  |
Fixed annual rate | 6.21% |  |  |  |  |  |  |
Percentage of joint venture property owned | 50.00% |  |  |  |  |  |  |
Percentage of secured obligation | 50.00% |  |  |  |  |  |  |
Maturity date | Nov. 02, 2025 |  |  |  |  |  |  |

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