Debt - Additional Information (Detail) $ in Millions																					1 Months Ended	12 Months Ended
		Mar. 18, 2025 USD ($)	Mar. 04, 2025 USD ($)	Jul. 29, 2024 USD ($)	May 31, 2024	May 24, 2024	May 22, 2024	Jan. 01, 2024	Jun. 15, 2023 CAD ($)	May 19, 2023 CAD ($)	May 04, 2023 CAD ($)	Apr. 13, 2023 USD ($)	Jan. 31, 2023 CAD ($)	Dec. 20, 2022 CAD ($)	Sep. 20, 2022 CAD ($)	May 26, 2022 USD ($)	May 17, 2022 USD ($)	Apr. 26, 2022 USD ($)	Dec. 30, 2021 USD ($)	Nov. 30, 2021 USD ($) SpecialEntity	May 31, 2023 USD ($)	Dec. 31, 2024 USD ($)	Nov. 15, 2024 USD ($)	Nov. 14, 2024	Sep. 25, 2024 USD ($)	Jun. 28, 2024 USD ($)	Mar. 28, 2024 USD ($)	Mar. 04, 2024 USD ($)	Dec. 31, 2023 USD ($)		Sep. 28, 2023 USD ($)	Jun. 15, 2023 USD ($)	Dec. 20, 2022 USD ($)	Dec. 19, 2022 USD ($)	Jul. 08, 2021 USD ($)
Line Of Credit Facility [Line Items]
Weighted average interest rate																						6.70%
SOFR
Line Of Credit Facility [Line Items]
Notional amount																												$ 87,100,000
SmartStop Delayed Draw Mezzanine Loan Agreement
Line Of Credit Facility [Line Items]
Repaid outstanding balance																					$ 50,000,000
Huntington Credit Facility
Line Of Credit Facility [Line Items]
Number of Special Purpose Entities | SpecialEntity																				3
Line of credit facility, maximum borrowing capacity												$ 107,600,000								$ 50,000,000
Term loan maturity date												Nov. 30, 2025										Nov. 30, 2027							Nov. 30, 2027	[1]
Applicable interest rate	[1]																												6.94%
Line of credit facility, amount borrowed												$ 12,500,000						$ 12,900,000	$ 14,700,000	$ 22,400,000
Debt Instrument, Interest Rate, Effective Percentage																						6.94%	5.50%
Percentage of recourse guaranty																							50.00%	25.00%
Huntington Credit Facility | Floor
Line Of Credit Facility [Line Items]
Applicable interest rate																						3.25%
Huntington Credit Facility | Secured Overnight Financing Rate
Line Of Credit Facility [Line Items]
Debt instrument variable interest rate																						2.61%
Interest rate term																						1
Huntington Credit Facility | SOFR
Line Of Credit Facility [Line Items]
Debt Instrument, Interest Rate, Effective Percentage												2.92%										2.89%	2.89%				0.50%
Notional amount	[2]																												$ 47,574,000
Huntington Credit Facility | Second Amendment
Line Of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity																	$ 100,000,000
Line of credit facility, amount borrowed																$ 30,600,000	14,500,000
Line of credit, additional borrowing capacity																	$ 50,000,000
Huntington Credit Facility | Interest Rate Swap Agreement
Line Of Credit Facility [Line Items]
Notional amount																							$ 107,600,000
Huntington Credit Facility | Interest Rate Swap Agreement | Secured Overnight Financing Rate
Line Of Credit Facility [Line Items]
Applicable interest rate												4.01%
Huntington Credit Facility | Interest Rate Cap
Line Of Credit Facility [Line Items]
Notional amount												$ 47,600,000																			$ 47,600,000
Huntington Credit Facility | Interest Rate Cap | Secured Overnight Financing Rate
Line Of Credit Facility [Line Items]
Applicable interest rate												2.60%																			1.10%
Huntington Credit Facility | Interest Rate Swap Agreement One
Line Of Credit Facility [Line Items]
Notional amount												$ 38,000,000													$ 38,000,000		$ 38,000,000
Huntington Credit Facility | Interest Rate Swap Agreement Two
Line Of Credit Facility [Line Items]
Notional amount												$ 22,000,000													$ 22,000,000		$ 22,000,000
Skymar Loan
Line Of Credit Facility [Line Items]
Term loan maturity date																																			Aug. 01, 2024
Applicable interest rate																																			4.125%
Mortgage loan, amount																																			$ 4,800,000
Skymar - Vancouver Loan | Interest Rate Swap Agreement
Line Of Credit Facility [Line Items]
Notional amount																												$ 87,100,000
Loans from SmartStop OP, L.P. | SmartStop Delayed Draw Mezzanine Loan Agreement | Cambridge Property
Line Of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity																																	$ 55,000,000	$ 45,000,000
Loans from SmartStop OP, L.P. | SmartStop Delayed Draw Mezzanine Loan Agreement | Secured Overnight Financing Rate | Cambridge Property
Line Of Credit Facility [Line Items]
Debt instrument, description of variable rate basis														SOFR plus 3%
Loans from SmartStop OP, L.P. | SmartStop Bridge Loan Agreement
Line Of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity																																$ 15,000,000
Commitment fee percentage									1.00%
Applicable interest rate																						8.49%
Line of credit facility, amount borrowed				$ 8,000,000
Debt instrument, maturity date, description																						On December 8, 2023, we exercised the option to extend the maturity date for an additional year, through December 31, 2024.
Line of credit facility, available capacity																						$ 2,000,000
Loans from SmartStop OP, L.P. | SmartStop Bridge Loan Agreement | Secured Overnight Financing Rate
Line Of Credit Facility [Line Items]
Debt instrument, description of variable rate basis								SOFR plus 4.00%	SOFR plus 3.00%
Debt instrument variable interest rate								4.00%	3.00%
Loans from SmartStop OP, L.P. | Minimum | SmartStop Bridge Loan Agreement
Line Of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity																										$ 15,000,000
Loans from SmartStop OP, L.P. | Maximum | SmartStop Delayed Draw Mezzanine Loan Agreement | Bradenton Property and Apopka Property
Line Of Credit Facility [Line Items]
Loan in connection with acquisition of Bradenton Property and Apopka Property																			$ 45,000,000
Loans from SmartStop OP, L.P. | Maximum | SmartStop Bridge Loan Agreement
Line Of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity																										$ 25,000,000
National Bank of Canada Loan | Acquisition of North York Property
Line Of Credit Facility [Line Items]
Debt instrument carrying amount													$ 25.0
National Bank of Canada Loan | CDOR | Acquisition of North York Property
Line Of Credit Facility [Line Items]
Debt instrument variable interest rate													2.40%
Interest rate term													one month
National Bank of Canada Loan | Interest Rate Swap Agreement | Acquisition of North York Property
Line Of Credit Facility [Line Items]
Notional amount													$ 25.0
Debt instrument maturity date													Jan. 31, 2025
Debt instrument, frequency of payment													monthly
Debt instrument amortization period													25 years
National Bank of Canada Loan | Interest Rate Swap Agreement | CDOR | Acquisition of North York Property
Line Of Credit Facility [Line Items]
Applicable interest rate													3.79%
National Bank of Canada | Burlington Property
Line Of Credit Facility [Line Items]
Term loan															$ 16.5
National Bank of Canada | Cambridge Property
Line Of Credit Facility [Line Items]
Term loan														$ 15.5
National Bank of Canada | CDOR | Burlington Property
Line Of Credit Facility [Line Items]
Debt instrument variable interest rate															2.25%
Interest rate term															one month
National Bank of Canada | CDOR | Cambridge Property
Line Of Credit Facility [Line Items]
Debt instrument variable interest rate														2.25%
Interest rate term														one month
National Bank of Canada | CORRA | Burlington Property
Line Of Credit Facility [Line Items]
Debt instrument variable interest rate							2.25%
National Bank of Canada | CORRA | Cambridge Property
Line Of Credit Facility [Line Items]
Debt instrument variable interest rate							2.25%
National Bank of Canada | CORRA | Acquisition of North York Property
Line Of Credit Facility [Line Items]
Debt instrument variable interest rate							2.40%
National Bank of Canada | Interest Rate Swap Agreement | Burlington Property
Line Of Credit Facility [Line Items]
Notional amount															$ 16.5
Debt instrument maturity date															Sep. 20, 2025
Debt instrument, frequency of payment															monthly
Debt instrument amortization period															25 years
National Bank of Canada | Interest Rate Swap Agreement | Cambridge Property
Line Of Credit Facility [Line Items]
Notional amount														$ 15.5
Debt instrument maturity date														Dec. 20, 2025
Debt instrument, frequency of payment														monthly
Debt instrument amortization period														25 years
National Bank of Canada | Interest Rate Swap Agreement | CDOR | Burlington Property
Line Of Credit Facility [Line Items]
Applicable interest rate															4.02%
National Bank of Canada | Interest Rate Swap Agreement | CDOR | Cambridge Property
Line Of Credit Facility [Line Items]
Applicable interest rate														3.83%																			3.83%
National Bank of Canada | Interest Rate Swap Agreement | CORRA | Burlington Property
Line Of Credit Facility [Line Items]
Applicable interest rate							0.30%
National Bank of Canada | Interest Rate Swap Agreement | CORRA | Cambridge Property
Line Of Credit Facility [Line Items]
Applicable interest rate							0.30%
National Bank of Canada | Interest Rate Swap Agreement | CORRA | Acquisition of North York Property
Line Of Credit Facility [Line Items]
Applicable interest rate							0.30%
Bank of Montreal Loan
Line Of Credit Facility [Line Items]
Debt instrument, initial term											2 years
Debt instrument carrying amount											$ 21.6
Debt instrument maturity date											May 04, 2025
Extension option period											1 year
Bank of Montreal Loan | CDOR
Line Of Credit Facility [Line Items]
Debt instrument variable interest rate											2.50%
Interest rate term											one-month
Bank of Montreal Loan | CORRA
Line Of Credit Facility [Line Items]
Debt instrument variable interest rate						2.50%
Bank of Montreal Loan | Interest Rate Swap Agreement
Line Of Credit Facility [Line Items]
Notional amount											$ 21.6
Bank of Montreal Loan | Interest Rate Swap Agreement | CDOR
Line Of Credit Facility [Line Items]
Applicable interest rate											4.47%
Bank of Montreal Loan | Interest Rate Swap Agreement | CORRA
Line Of Credit Facility [Line Items]
Applicable interest rate						0.30%
First National Loan
Line Of Credit Facility [Line Items]
Term loan maturity date	[3]																												Jun. 01, 2025
Applicable interest rate																													8.60%
Debt instrument, initial term										2 years
Debt instrument carrying amount										$ 8.8
Debt instrument maturity date										Jun. 01, 2025
First National Loan | Royal Bank of Canada Prime Rate
Line Of Credit Facility [Line Items]
Debt instrument variable interest rate										1.90%
National Bank of Canada - Ontario Loan
Line Of Credit Facility [Line Items]
Debt instrument carrying amount									$ 127.2
Debt instrument maturity date									Jun. 15, 2025
Debt instrument, frequency of payment									monthly
Debt instrument amortization period									25 years
National Bank of Canada - Ontario Loan | CDOR
Line Of Credit Facility [Line Items]
Debt instrument variable interest rate									2.60%
Interest rate term									one month
National Bank of Canada - Ontario Loan | CORRA
Line Of Credit Facility [Line Items]
Debt instrument variable interest rate					2.60%
National Bank of Canada - Ontario Loan | Interest Rate Swap Agreement
Line Of Credit Facility [Line Items]
Notional amount									$ 127.2
National Bank of Canada - Ontario Loan | Interest Rate Swap Agreement | CDOR
Line Of Credit Facility [Line Items]
Applicable interest rate									4.73%																							4.73%
National Bank of Canada - Ontario Loan | Interest Rate Swap Agreement | CORRA
Line Of Credit Facility [Line Items]
Applicable interest rate					0.30%
Extended Maturity | Huntington Credit Facility
Line Of Credit Facility [Line Items]
Term loan maturity date																							Nov. 30, 2027
Extended Maturity | Loans from SmartStop OP, L.P. | SmartStop Delayed Draw Mezzanine Loan Agreement | Cambridge Property
Line Of Credit Facility [Line Items]
Debt instrument maturity date														Dec. 30, 2023
Extended Maturity | Loans from SmartStop OP, L.P. | SmartStop Bridge Loan Agreement
Line Of Credit Facility [Line Items]
Term loan maturity date																										Dec. 31, 2025
Subsequent Event | Skymar - Vancouver Loan
Line Of Credit Facility [Line Items]
Applicable interest rate			7.55%
Mortgage loan, amount			$ 13,000,000
Debt instrument maturity date			Apr. 01, 2030
Subsequent Event | Skymar - Bradenton Loan
Line Of Credit Facility [Line Items]
Applicable interest rate		7.50%
Mortgage loan, amount		$ 9,100,000
Debt instrument maturity date		Apr. 01, 2030
Debt instrument, frequency of payment		monthly

[1] This variable rate loan encumbers 13 properties (Phoenix I, Las Vegas, Phoenix II, Surprise, Bradenton, Apopka, Vancouver WA, Portland, Newark, Levittown, Chandler, St. Johns and Oxford). We entered into interest rate swap agreement that fixes SOFR at 2.89% until the maturity of the loan.

[2] Notional amount is denominated in USD and we have elected not to apply hedge accounting.

[3] This variable rate loan encumbers our Edmonton, AB property and the amount shown above is in USD based on the foreign exchange rate in effect as of December 31, 2024 and 2023, respectively. On January 8, 2025, in connection with entering into the National Bank of Canada - Four Property Loan, the First National Loan was repaid in full and terminated in accordance with the loan agreement without fees or penalties. See Note 13 - Subsequent events.