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INVESTMENT ACTIVITY - Company's consolidated balance sheets (Details) $ in Thousands	21 Months Ended
	Sep. 30, 2025 USD ($) property segment
INVESTMENT ACTIVITY
Number of joint ventures | segment	3
Port Chester, NY
INVESTMENT ACTIVITY
Number of stores | property	1
CubeSmart Ownership Interest	90.00%
Total Construction Costs | $	$ 18,100
Astoria, NY
INVESTMENT ACTIVITY
Number of stores | property	1
CubeSmart Ownership Interest	70.00%
Total Construction Costs | $	$ 45,900
Clark, NJ
INVESTMENT ACTIVITY
Number of stores | property	1
CubeSmart Ownership Interest	90.00%
Total Construction Costs | $	$ 15,900
NY and NJ
INVESTMENT ACTIVITY
Number of stores | property	3
Total Construction Costs | $	$ 79,900

X

- Definition

The number of self-storage facilities with construction completed and opened for operation during the period.

+ References

No definition available.

+ Details

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Namespace Prefix:	cube_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the number of joint ventures involved in completion of construction and opened for operation of stores.

+ References

No definition available.

+ Details

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Namespace Prefix:	cube_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of real estate investment property construction costs capitalized.

+ References

No definition available.

+ Details

Name:	cube_RealEstateInvestmentPropertyConstructionCostsCapitalized
Namespace Prefix:	cube_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
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X

- Definition

Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 5A
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481203/810-10-50-5A

+ Details

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Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	cube_ScheduleOfRealEstateInvestmentPropertyAxis=cube_StoreFacilityLocatedInAstoriaNewYorkMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	cube_ScheduleOfRealEstateInvestmentPropertyAxis=cube_StoreFacilityLocatedInClarkNewJerseyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	cube_ScheduleOfRealEstateInvestmentPropertyAxis=cube_SelfStorageFacilitiesInNewYorkAndNewJerseyMember
Namespace Prefix:
Data Type:	na
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Period Type: