Amount of total construction cost expected of the projects.

No definition available.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The increase (decrease) during the period for right-of-use asset for operating lease.

+ References

No definition available.

+ Details

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Namespace Prefix:	cube_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Number of facilities acquired with existing ground leases.

+ References

No definition available.

+ Details

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

- Definition

Number of facilities acquired with existing ground leases, for which the leases were classified as finance leases.

+ References

No definition available.

+ Details

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

- Definition

Number of facilities acquired with existing ground leases, for which the leases were classified as operating leases.

+ References

No definition available.

+ Details

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

- 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:monetaryItemType
Balance Type:	debit
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- Definition

Represents the number of facilities under contract.

+ References

No definition available.

+ Details

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

- Definition

Represents the information pertaining to number of joint ventures.

+ References

No definition available.

+ Details

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

- Definition

Represents the number of real estate properties that were acquired.

+ References

No definition available.

+ Details

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

- Definition

Represents the number of real estate acquired properties of which mortgages were assumed.

+ References

No definition available.

+ Details

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

- Definition

Represents the number of real estate properties that were sold.

+ References

No definition available.

+ Details

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

- Definition

Number of real estate property acquisition tranches.

+ References

No definition available.

+ Details

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Namespace Prefix:	cube_
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Balance Type:	na
Period Type:	duration

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The number of self-storage facilities involved in transaction.

+ References

No definition available.

+ Details

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

- Definition

Present value of lessee's discounted obligation for lease payments from operating lease, derecognized.

+ References

No definition available.

+ Details

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Amount of lessee's right to use underlying asset under operating lease, derecognized.

+ References

No definition available.

+ Details

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Balance Type:	debit
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- Definition

Represents the option to put ownership interest in the venture.

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	duration

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Cash portion of put option paid.

+ References

No definition available.

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Balance Type:	debit
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Put option ownership percentage in joint venture exercised.

+ References

No definition available.

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Data Type:	dtr-types:percentItemType
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Represents the debt assumed on real estate acquisition.

+ References

No definition available.

+ Details

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Represents the premium on debt assumed on real estate acquisition.

+ References

No definition available.

+ Details

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Real estate property acquired, land subject to ground lease.

+ References

No definition available.

+ Details

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Represents the value of the operating units issued during the period.

+ References

No definition available.

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Shares classified as temporary equity issued during the period.

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

+ References

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-SubTopic 30
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-Paragraph 2
-URI https://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274

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Period Type:	duration

- Definition

Percentage of voting equity interests acquired at the acquisition date in the business combination.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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-Paragraph 2
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

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- Definition

Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

+ References

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- Definition

Amount of long-term debt due after one year or the normal operating cycle, if longer, assumed at the acquisition date.

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-SubTopic 20
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-Paragraph 1
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- Definition

Percentage of equity in the acquiree held by the acquirer immediately before the acquisition date in a business combination.

+ References

No definition available.

+ Details

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- Definition

In a business combination achieved in stages, this element represents the amount of net gain (loss) recognized by the entity as a result of remeasuring to fair value the equity interest in the acquiree it held before the business combination.

+ References

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- Definition

The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 11.L)
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-Paragraph 2
-Subparagraph (SX 210.5-03.2(a),(d))
-URI https://asc.fasb.org/extlink&oid=126953954&loc=SL114868664-224227

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Balance Type:	debit
Period Type:	duration

- Definition

The current amount of expenditures for a real estate project that has not yet been completed.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.10)
-URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910

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Balance Type:	debit
Period Type:	instant

- Definition

This element represents the amount of value allocated by a lessor (acquirer) to lease agreements which exist at acquisition of a leased property. Such amount may include the value assigned to existing tenant relationships and excludes the market adjustment component of the value assigned for above or below-market leases acquired.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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Period Type:	instant

- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-Subparagraph (c)
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-SubTopic 10
-Section 45
-Paragraph 5
-URI https://asc.fasb.org/extlink&oid=126905981&loc=d3e2443-110228

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Period Type:	duration

- Definition

Amount of increase (decrease) in obligation for operating lease.

+ References

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-Name Accounting Standards Codification
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-Paragraph 4
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-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585

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Decrease in noncontrolling interest (for example, but not limited to, redeeming or purchasing the interests of noncontrolling shareholders, issuance of shares (interests) by the non-wholly owned subsidiary to the parent entity for other than cash, and a buyback of shares (interest) by the non-wholly owned subsidiary from the noncontrolling interests).

+ References

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-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI https://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770

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Period Type:	duration

- Definition

The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of lessee's right to use underlying asset under operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977

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Balance Type:	debit
Period Type:	instant

- Definition

The number of units redeemed during the year of each class of partners' capital account. Units represent shares of ownership of the general, limited, and preferred partners.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Paragraph 5
-Subparagraph (SAB Topic 4.F)
-URI https://asc.fasb.org/extlink&oid=120397183&loc=d3e187171-122770

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Balance Type:	na
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- Definition

The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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-Subparagraph (b)(1)
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-Paragraph 13
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3213-108585

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Period Type:	duration

- Definition

The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

+ References

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-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3213-108585

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- Definition

The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Subparagraph (c)
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- 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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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Balance Type:	credit
Period Type:	duration

- Definition

Value of new stock classified as temporary equity issued during the period.

+ References

No definition available.

+ Details

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Balance Type:	credit
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- Definition

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

+ References

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- Details

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INVESTMENT ACTIVITY (Details)								1 Months Ended	3 Months Ended	12 Months Ended			24 Months Ended	36 Months Ended
INVESTMENT ACTIVITY (Details)	Apr. 28, 2022 USD ($)	Feb. 02, 2022 USD ($)	Dec. 14, 2021 USD ($)	Dec. 09, 2021 facility item	Jun. 29, 2021 USD ($)	Dec. 22, 2020 USD ($)	Sep. 29, 2020 USD ($) shares	Jul. 31, 2020 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2022 USD ($) facility shares	Dec. 31, 2021 USD ($) facility shares	Dec. 31, 2020 USD ($) facility item shares	Dec. 31, 2021 USD ($) item	Dec. 31, 2022 USD ($) facility
Self-storage facilities
Gains from sales of real estate, net											$ 32,698,000	$ 6,710,000
Number of facilities, construction completed and opened														$ 7
Total Construction Costs														202,600,000
Acquisition of noncontrolling interest											$ 3,397,000
OP units redeemed \| shares										475,046	5,519,233	100,000
Right-of-use assets - operating leases									$ 54,741,000	$ 49,491,000	$ 54,741,000		$ 54,741,000	$ 49,491,000
LAACO
Self-storage facilities
Gains from sales of real estate, net										0
New York
Self-storage facilities
Cash paid for acquisition							$ 1,000,000.0
Units issued (in shares) \| shares							276,497
Units issued							$ 9,000,000.0
LAACO.
Self-storage facilities
Gains from sales of real estate, net										$ 0
Self storage under construction
Self-storage facilities
Number of self-storage facilities \| facility										2				2
Development costs										$ 27,600,000				$ 27,600,000
Expected construction cost										$ 64,000,000.0				$ 64,000,000.0
Self storage under construction \| New York
Self-storage facilities
Number of self-storage facilities \| facility										1				1
Self storage under construction \| New Jersey
Self-storage facilities
Number of self-storage facilities \| facility										1				1
Self Storage Facility in Valley Stream, NY
Self-storage facilities
Number of facilities, construction completed and opened														$ 1
Ownership interest held by the entity (as a percent)														51.00%
Total Construction Costs														$ 39,000,000
Self Storage Facility in Vienna, VA
Self-storage facilities
Number of facilities, construction completed and opened														$ 1
Ownership interest held by the entity (as a percent)														80.00%
Total Construction Costs														$ 21,800,000
Self Storage Facility in Newton, MA
Self-storage facilities
Number of facilities, construction completed and opened														$ 1
Ownership interest held by the entity (as a percent)														100.00%
Total Construction Costs														$ 20,800,000
Self-storage facility in East Meadow, NY
Self-storage facilities
Number of facilities, construction completed and opened														$ 1
Ownership interest held by the entity (as a percent)														100.00%
Total Construction Costs														$ 25,900,000
Self-storage facility in King of Prussia, PA
Self-storage facilities
Number of facilities, construction completed and opened														$ 1
Ownership interest held by the entity (as a percent)														70.00%
Total Construction Costs														$ 22,800,000
Self-storage Facility in Arlington, VA
Self-storage facilities
Number of facilities, construction completed and opened														$ 1
Ownership interest held by the entity (as a percent)														90.00%
Total Construction Costs														$ 26,400,000
Self Storage Facility in Brooklyn, NY I
Self-storage facilities
Number of facilities, construction completed and opened														$ 1
Ownership interest held by the entity (as a percent)														100.00%
Total Construction Costs														$ 45,900,000
2021 Acquisitions
Self-storage facilities
Number of self-storage facilities acquired \| facility											66
Aggregate purchase price											$ 1,801,251,000
2021 Acquisitions \| LAACO
Self-storage facilities
Number of self-storage facilities acquired \| facility				57
Intangible value of the in-place leases										$ 109,700,000				109,700,000
Estimated life										12 months
Amortization expense										$ 100,600,000	$ 9,100,000
Number of facilities under contract \| facility				1
Number of joint ventures \| item				2
2021 Acquisitions \| Acquisitions \| LAACO
Self-storage facilities
Ownership interest held by the entity (as a percent)				50.00%
2021 Acquisitions \| LAACO
Self-storage facilities
Percentage of interest acquired				50.00%
2021 Acquisitions \| Texas \| LAACO
Self-storage facilities
Number of self-storage facilities acquired \| facility				7
2021 Acquisitions \| Nevada \| LAACO
Self-storage facilities
Number of self-storage facilities acquired \| facility				13
2021 Acquisitions \| California \| LAACO
Self-storage facilities
Number of self-storage facilities acquired \| facility				20
2021 Acquisitions \| Arizona \| LAACO
Self-storage facilities
Number of self-storage facilities acquired \| facility				17
2021 Acquisitions \| Self-storage facilities located in US
Self-storage facilities
Number of self-storage facilities acquired \| facility											8
Aggregate purchase price											$ 140,800,000
Intangible value of the in-place leases									11,900,000		$ 11,900,000		11,900,000
Estimated life											12 months
Amortization expense										$ 8,300,000	$ 3,600,000
2021 Acquisitions \| Self-storage facilities located in US \| Florida
Self-storage facilities
Number of self-storage facilities acquired \| facility											1
2021 Acquisitions \| Self-storage facilities located in US \| Maryland
Self-storage facilities
Number of self-storage facilities acquired \| facility											1
2021 Acquisitions \| Self-storage facilities located in US \| Nevada
Self-storage facilities
Number of self-storage facilities acquired \| facility											1
2021 Acquisitions \| Self-storage facilities located in US \| Pennsylvania
Self-storage facilities
Number of self-storage facilities acquired \| facility											2
2021 Acquisitions \| Self-storage facilities located in US \| New Jersey
Self-storage facilities
Number of self-storage facilities acquired \| facility											1
2021 Acquisitions \| Self-storage facilities located in US \| Illinois
Self-storage facilities
Number of self-storage facilities acquired \| facility											1
2021 Acquisitions \| Self-storage facilities located in US \| Georgia
Self-storage facilities
Number of self-storage facilities acquired \| facility											1
2021 Acquisitions \| Self-storage facility in Anoka, MN
Self-storage facilities
Aggregate purchase price											$ 12,000,000.0
Ownership interest held by the entity (as a percent)											50.00%
2022 Acquisitions
Self-storage facilities
Number of self-storage facilities acquired \| facility										3
Aggregate purchase price										$ 75,700,000
Intangible value of the in-place leases										$ 3,400,000				3,400,000
Estimated life										12 months
2022 Acquisitions \| Leases, Acquired-in-Place
Self-storage facilities
Amortization expense										$ 2,300,000
2022 Acquisitions \| Texas
Self-storage facilities
Number of self-storage facilities acquired \| facility										1
2022 Acquisitions \| Maryland
Self-storage facilities
Number of self-storage facilities acquired \| facility										1
2022 Acquisitions \| Georgia
Self-storage facilities
Number of self-storage facilities acquired \| facility										1
2022 Acquisitions \| Self-storage Facility in Bronx, NY
Self-storage facilities
Aggregate purchase price		$ 7,500,000
Lease liability derecognized		5,000,000.0
Right of use Assets derecognized		$ 4,100,000
2021 Dispositions
Self-storage facilities
Number of self-storage facilities sold \| facility											5
Aggregate sale price											$ 43,800,000
Gains from sales of real estate, net											$ 32,700,000
2021 Dispositions \| Texas
Self-storage facilities
Number of self-storage facilities sold \| facility											1
2021 Dispositions \| Colorado
Self-storage facilities
Number of self-storage facilities sold \| facility											1
2021 Dispositions \| Nevada
Self-storage facilities
Number of self-storage facilities sold \| facility											1
2021 Dispositions \| North Carolina
Self-storage facilities
Number of self-storage facilities sold \| facility											2
2022 Dispositions \| LAACO
Self-storage facilities
Aggregate sale price										$ 44,000,000.0
2020 Acquisitions
Self-storage facilities
Number of self-storage facilities acquired \| facility												21
Aggregate purchase price												$ 735,875,000
2020 Acquisitions \| Texas
Self-storage facilities
Number of self-storage facilities acquired \| facility												3
2020 Acquisitions \| Florida
Self-storage facilities
Number of self-storage facilities acquired \| facility												5
2020 Acquisitions \| New York
Self-storage facilities
Number of self-storage facilities acquired \| facility												1
2020 Acquisitions \| Maryland
Self-storage facilities
Number of self-storage facilities acquired \| facility												1
2020 Acquisitions \| Nevada
Self-storage facilities
Number of self-storage facilities acquired \| facility												1
2020 Acquisitions \| Virginia
Self-storage facilities
Number of self-storage facilities acquired \| facility												1
2020 Acquisitions \| New Jersey
Self-storage facilities
Number of self-storage facilities acquired \| facility												1
2020 Acquisitions \| Self-storage facilities located in US
Self-storage facilities
Number of self-storage facilities acquired \| facility												13
Aggregate purchase price												$ 195,900,000
2020 Acquisitions \| Self-storage facilities located in US \| Leases, Acquired-in-Place
Self-storage facilities
Intangible value of the in-place leases												11,400,000
Estimated life											12 months
Amortization expense										0	$ 9,300,000	$ 2,100,000
2020 Acquisitions \| Self-storage Facility in Bronx, NY I
Self-storage facilities
Real estate property acquired, land subject to ground lease								$ 9,500,000
Decrease in right-of-use asset								5,100,000
Decrease in Operating Lease Liability								$ 5,000,000.0
2020 Acquisitions \| Self-storage facilities located in New York
Self-storage facilities
Number of self-storage facilities acquired \| facility												8
Number of real estate property acquisition tranches \| item												2
Aggregate purchase price												$ 540,000,000.0
Cash paid for acquisition												210,500,000
Issuance of OP Shares												175,100,000
Repayments of debt												33,200,000
Units issued												$ 5,272,023
Number of properties, assumed mortgage \| item												6
Assumed mortgage debt, at fair value									$ 169,200,000		$ 169,200,000		$ 169,200,000
Outstanding principal balance of mortgage debt assumed on acquisitions										$ 154,400,000				$ 154,400,000
Premium on debt assumed on acquisitions												$ 14,800,000
2020 Acquisitions \| Self-storage facilities located in New York \| Leases, Acquired-in-Place
Self-storage facilities
Intangible value of the in-place leases												$ 48,600,000
Estimated life											12 months
Amortization expense											$ 48,600,000
Number of assumed ground leases \| item												3
Number of facilities acquired with existing ground leases, for which the leases were classified as finance leases \| item												2
Number of facilities acquired with existing ground leases, for which the leases were classified as operating leases \| item												1
2020 Dispositions
Self-storage facilities
Aggregate sale price												$ 12,750,000
2020 Dispositions \| Self-storage facilities located in New York
Self-storage facilities
Aggregate sale price						$ 12,800,000
Gains from sales of real estate, net						$ 6,700,000
Joint Venture \| Acquisitions
Self-storage facilities
Real estate property acquired, land subject to ground lease	$ 6,100,000
Percentage of interest acquired	20.00%
Joint Venture \| Self Storage Facility in Newton, MA
Self-storage facilities
Total consideration			$ 3,400,000
Acquisition, gain (loss) recognized			$ 0
Ownership interest held by the entity (as a percent)									90.00%
Minority ownership interest (as a percent)			0.00%
Acquisition of noncontrolling interest			$ 2,700,000
Repayments of debt			$ 13,200,000
Joint Venture \| Self Storage Facility in Newton, MA \| Joint Venture
Self-storage facilities
Acquisition of remaining interest in real estate ventures (as a percent)			10.00%
Joint Venture \| Self-storage facility in East Meadow, NY
Self-storage facilities
Put option ownership percentage in joint venture exercised (as a percent)					49.00%
Option to put ownership interest in the venture					$ 6,600,000
Joint Venture \| Self-storage Facility in Brooklyn, NY
Self-storage facilities
Issuance of OP Shares							$ 9,000,000.0
Ownership interest held by the entity (as a percent)													51.00%
Number of joint ventures \| item													2
Put option ownership percentage in joint venture exercised (as a percent)							49.00%
Option to put ownership interest in the venture							$ 10,000,000.0
Cash portion of put option paid							$ 1,000,000.0
Units issued (in shares) \| shares							276,497