Debt - Additional Information (Detail) |
3 Months Ended | 9 Months Ended | ||||||||||||||||||
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Aug. 03, 2020
USD ($)
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Jun. 07, 2019
USD ($)
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Jan. 24, 2019
USD ($)
Property
Extension
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Oct. 11, 2018
CAD ($)
Property
Extension
SpecialPurposeEntity
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Sep. 30, 2020
USD ($)
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Sep. 30, 2019
USD ($)
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Sep. 30, 2020
USD ($)
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Sep. 30, 2019
USD ($)
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Sep. 30, 2020
CAD ($)
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May 08, 2020
USD ($)
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Dec. 31, 2019
USD ($)
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Oct. 29, 2019
USD ($)
|
Jul. 08, 2019
CAD ($)
|
Jan. 29, 2019
USD ($)
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Jan. 25, 2019
CAD ($)
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Oct. 01, 2018
USD ($)
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| Debt Instrument [Line Items] | ||||||||||||||||||||
| Weighted average interest rate on debt | 3.73% | 3.73% | 3.73% | |||||||||||||||||
| Loss on extinguishment of debt | $ 0 | $ 0 | $ 0 | $ (1,487,867) | ||||||||||||||||
| Debt Instrument Carrying Amount | 717,069,469 | $ 717,069,469 | ||||||||||||||||||
| Line of credit facility, number of extension options | Extension | 2 | |||||||||||||||||||
| Line of credit facility, term of extension options | 1 year | |||||||||||||||||||
| Derivative, notional amount | $ 95,000,000 | $ 161,200,000 | $ 90,000,000 | |||||||||||||||||
| Debt instrument face amount | $ 500,178,000 | |||||||||||||||||||
| Minimum | Secured Loan Amendment | ||||||||||||||||||||
| Debt Instrument [Line Items] | ||||||||||||||||||||
| Amendment to secured loan with secured lenders | $ 10,000,000 | |||||||||||||||||||
| Maximum | Secured Loan Amendment | ||||||||||||||||||||
| Debt Instrument [Line Items] | ||||||||||||||||||||
| Amendment to secured loan with secured lenders | $ 15,000,000 | |||||||||||||||||||
| Fixed Rate Secured Debt | ||||||||||||||||||||
| Debt Instrument [Line Items] | ||||||||||||||||||||
| Debt instrument, description of variable rate basis | LIBOR plus 2.5% | |||||||||||||||||||
| Debt instrument, basis spread on variable rate | 2.50% | |||||||||||||||||||
| Derivative, notional amount | $ 89,200,000 | |||||||||||||||||||
| Debt instrument, interest rate | 2.60% | |||||||||||||||||||
| Debt instrument face amount | $ 89,178,000 | |||||||||||||||||||
| Fixed Rate Secured Debt | ||||||||||||||||||||
| Debt Instrument [Line Items] | ||||||||||||||||||||
| Number of wholly owned properties | Property | 16 | |||||||||||||||||||
| Debt Instrument Maturity Date | Jan. 24, 2022 | |||||||||||||||||||
| Line of credit facility, number of extension options | Extension | 1 | |||||||||||||||||||
| Line of credit facility, term of extension options | 1 year | |||||||||||||||||||
| Debt instrument face amount | $ 89,200,000 | |||||||||||||||||||
| LIBOR | Minimum | Secured Loan Amendment | ||||||||||||||||||||
| Debt Instrument [Line Items] | ||||||||||||||||||||
| Debt Instrument, Interest Rate | 0.50% | |||||||||||||||||||
| Interest Rate Cap | ||||||||||||||||||||
| Debt Instrument [Line Items] | ||||||||||||||||||||
| Debt Instrument Maturity Date | Aug. 02, 2021 | |||||||||||||||||||
| Derivative, notional amount | $ 80,000,000 | |||||||||||||||||||
| Debt instrument, interest rate | 0.50% | |||||||||||||||||||
| Interest Rate Cap | LIBOR | ||||||||||||||||||||
| Debt Instrument [Line Items] | ||||||||||||||||||||
| Debt instrument, interest rate | 0.50% | |||||||||||||||||||
| Interest Rate Swap | Fixed Rate Secured Debt | Termination | ||||||||||||||||||||
| Debt Instrument [Line Items] | ||||||||||||||||||||
| Derivative, notional amount | $ 85,500,000 | |||||||||||||||||||
| KeyBank and Citi Real Estate Funding | ||||||||||||||||||||
| Debt Instrument [Line Items] | ||||||||||||||||||||
| Debt Instrument Carrying Amount | 235,000,000 | |||||||||||||||||||
| CMBS SASB Mortgage Loan | ||||||||||||||||||||
| Debt Instrument [Line Items] | ||||||||||||||||||||
| Debt Instrument Carrying Amount | $ 180,000,000 | |||||||||||||||||||
| Number of wholly owned properties | Property | 29 | |||||||||||||||||||
| Debt Instrument Maturity Date | Feb. 09, 2022 | |||||||||||||||||||
| Derivative, notional amount | $ 180,000,000 | |||||||||||||||||||
| Derivative, inception date | Jan. 24, 2019 | |||||||||||||||||||
| CMBS SASB Mortgage Loan | Interest Rate Cap | ||||||||||||||||||||
| Debt Instrument [Line Items] | ||||||||||||||||||||
| Derivative, notional amount | $ 180,000,000 | |||||||||||||||||||
| CMBS SASB Mezzanine Loan | ||||||||||||||||||||
| Debt Instrument [Line Items] | ||||||||||||||||||||
| Debt Instrument Carrying Amount | $ 55,000,000 | |||||||||||||||||||
| Number of special purpose entities | Property | 29 | |||||||||||||||||||
| Debt Instrument Maturity Date | Feb. 09, 2022 | |||||||||||||||||||
| Derivative, notional amount | $ 55,000,000 | |||||||||||||||||||
| Derivative, inception date | Jan. 24, 2019 | |||||||||||||||||||
| CMBS SASB Mezzanine Loan | Interest Rate Cap | ||||||||||||||||||||
| Debt Instrument [Line Items] | ||||||||||||||||||||
| Derivative, notional amount | $ 55,000,000 | |||||||||||||||||||
| CMBS SASB Loan | ||||||||||||||||||||
| Debt Instrument [Line Items] | ||||||||||||||||||||
| Debt instrument, description | (a) the borrower with respect to the CMBS SASB Mortgage Loan has purchased an interest rate cap with a notional amount of $180 million, with an effective date of January 24, 2019, whereby LIBOR is capped at 3% through February 15, 2022 and (b) the borrower with respect to the CMBS SASB Mezzanine Loan has purchased an interest rate cap with a notional amount of $55 million, with an effective date of January 24, 2019, whereby LIBOR is capped at 3% through February 15, 2022. On June 7, 2019, to effectively terminate our $180 million and $55 million existing interest rate caps, we sold an offsetting interest rate cap with a notional amount of $235 million, whereby LIBOR is capped at 3% through February 15, 2022. We simultaneously entered into an interest rate swap with a notional amount of $235 million, whereby LIBOR is fixed at 1.79% through February 15, 2022. None of the CMBS SASB Loan may be prepaid, in whole or in part, without satisfying certain conditions as set forth in the respective CMBS SASB Loan Agreements, such as the payment of a spread maintenance premium if the prepayment is made within the first two years. Thereafter the CMBS SASB Loan may be prepaid in whole or in part at par without penalty | |||||||||||||||||||
| Debt instrument face amount | $ 235,000,000 | |||||||||||||||||||
| CMBS SASB Loan | LIBOR | ||||||||||||||||||||
| Debt Instrument [Line Items] | ||||||||||||||||||||
| Debt instrument, description of variable rate basis | LIBOR plus 3% | |||||||||||||||||||
| Debt instrument, basis spread on variable rate | 3.00% | |||||||||||||||||||
| CMBS SASB Loan | Interest Rate Cap | ||||||||||||||||||||
| Debt Instrument [Line Items] | ||||||||||||||||||||
| Debt Instrument Maturity Date | Feb. 15, 2022 | |||||||||||||||||||
| Derivative, notional amount | $ 235,000,000 | |||||||||||||||||||
| Debt instrument, interest rate | 3.00% | |||||||||||||||||||
| CMBS SASB Loan | Interest Rate Swap | ||||||||||||||||||||
| Debt Instrument [Line Items] | ||||||||||||||||||||
| Debt Instrument Maturity Date | Feb. 15, 2022 | |||||||||||||||||||
| Derivative, notional amount | $ 235,000,000 | |||||||||||||||||||
| Debt instrument, interest rate | 1.79% | |||||||||||||||||||
| KeyBank CMBS Loan | ||||||||||||||||||||
| Debt Instrument [Line Items] | ||||||||||||||||||||
| Debt Instrument Carrying Amount | $ 104,000,000 | |||||||||||||||||||
| Number of wholly owned properties | Property | 10 | |||||||||||||||||||
| Debt Instrument Maturity Date | Feb. 01, 2029 | |||||||||||||||||||
| Debt instrument, interest rate | 5.00% | |||||||||||||||||||
| Minimum Number of Years to Defease the Loan | 2 years | |||||||||||||||||||
| Secured Loan | ||||||||||||||||||||
| Debt Instrument [Line Items] | ||||||||||||||||||||
| Debt Instrument Carrying Amount | [1],[2] | $ 85,512,000 | $ 85,512,000 | $ 85,512,000 | ||||||||||||||||
| Debt Instrument Maturity Date | [1],[2] | Jan. 24, 2022 | ||||||||||||||||||
| Debt Instrument, Interest Rate | [1],[2] | 3.00% | 3.00% | 3.00% | ||||||||||||||||
| Number of properties encumbered | 16 | 16 | ||||||||||||||||||
| Secured Loan | Fixed Rate Secured Debt | ||||||||||||||||||||
| Debt Instrument [Line Items] | ||||||||||||||||||||
| Outstanding balance on credit facility | $ 85,500,000 | $ 85,500,000 | $ 85,500,000 | |||||||||||||||||
| Secured Loan | Interest Rate Cap | LIBOR | ||||||||||||||||||||
| Debt Instrument [Line Items] | ||||||||||||||||||||
| Debt instrument, interest rate | 2.60% | |||||||||||||||||||
| Secured Loan | Interest Rate Swap | ||||||||||||||||||||
| Debt Instrument [Line Items] | ||||||||||||||||||||
| Derivative, notional amount | $ 85,500,000 | |||||||||||||||||||
| Canadian CitiBank | Canadian Debt Refinancing | ||||||||||||||||||||
| Debt Instrument [Line Items] | ||||||||||||||||||||
| Number of special purpose entities | SpecialPurposeEntity | 10 | |||||||||||||||||||
| Line of credit facility, number of extension options | Extension | 3 | |||||||||||||||||||
| Line of credit facility, term of extension options | 1 year | 1 year | ||||||||||||||||||
| Derivative, notional amount | $ 112,000,000 | $ 111,300,000 | ||||||||||||||||||
| Debt instrument, interest rate | 3.00% | |||||||||||||||||||
| Debt instrument, interest rate | 0.25% | |||||||||||||||||||
| Number of properties encumbered | Property | 10 | |||||||||||||||||||
| Maximum borrowings under credit facility | $ 112,000,000 | |||||||||||||||||||
| Proceeds from line of credit | $ 99,300,000 | |||||||||||||||||||
| Line of credit facility, description | The CitiBank Loan Agreement is a term loan, the original maturity date was October 9, 2020. The loan may, in certain circumstances, be extended at our option for three consecutive terms of one year each. We exercised the first one year extension option, extending the maturity date to October 9, 2021. Monthly payments due under the CitiBank Loan Agreement are interest-only, with the full principal amount becoming due and payable on the maturity date. | |||||||||||||||||||
| Line of credit facility, maturity date | Oct. 09, 2020 | |||||||||||||||||||
| Line of credit facility extended expiration date | Oct. 09, 2021 | |||||||||||||||||||
| Line of credit, interest rate description | The amounts outstanding under the CitiBank Loan Agreement bear interest at a rate equal to the sum of the “CDOR” (as defined in the CitiBank Loan Agreement) and 2.25%. | |||||||||||||||||||
| Canadian CitiBank | Maximum | Canadian Debt Refinancing | ||||||||||||||||||||
| Debt Instrument [Line Items] | ||||||||||||||||||||
| Line of credit facility, Additional borrowing capacity | $ 700,000 | |||||||||||||||||||
| Strategic Storage Growth Trust, Inc | ||||||||||||||||||||
| Debt Instrument [Line Items] | ||||||||||||||||||||
| Loss on extinguishment of debt | $ 1,500,000 | |||||||||||||||||||
| Debt Instrument Carrying Amount | $ 19,000,000 | |||||||||||||||||||
| Debt instrument face amount | $ 500,000,000 | |||||||||||||||||||
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