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NONCONTROLLING INTERESTS (Details 2) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Operating Partnership Ownership
Increase to OP units owned by third parties and a corresponding decrease to capital	$ 14,761us-gaap_MinorityInterestChangeInRedemptionValue	$ 3,292us-gaap_MinorityInterestChangeInRedemptionValue	$ 19,520us-gaap_MinorityInterestChangeInRedemptionValue
CubeSmart, L.P. and Subsidiaries
Operating Partnership Ownership
OP Units outstanding which are not owned by the general partner (as a percent)	1.40%cube_PercentageOfOwnershipInterestOfOperatingPartnershipNotOwnedByGeneralPartner / dei_LegalEntityAxis = us-gaap_SubsidiariesMember	1.60%cube_PercentageOfOwnershipInterestOfOperatingPartnershipNotOwnedByGeneralPartner / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Number of trading days used to determine average of the closing prices of the common shares	10 days
OP units outstanding (in shares)	2,257,486us-gaap_UnitsOfPartnershipInterestAmount / dei_LegalEntityAxis = us-gaap_SubsidiariesMember	2,275,730us-gaap_UnitsOfPartnershipInterestAmount / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Increase to OP units owned by third parties and a corresponding decrease to capital	$ 14,761us-gaap_MinorityInterestChangeInRedemptionValue / dei_LegalEntityAxis = us-gaap_SubsidiariesMember	$ 3,292us-gaap_MinorityInterestChangeInRedemptionValue / dei_LegalEntityAxis = us-gaap_SubsidiariesMember	$ 19,520us-gaap_MinorityInterestChangeInRedemptionValue / dei_LegalEntityAxis = us-gaap_SubsidiariesMember

X

- Definition

Represents the percentage of ownership in operating partnership not owned by the general partner.

+ References

No definition available.

+ Details

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X

- Definition

Represents the number of trading days used to determine average of the closing prices of the common shares for evaluation of the cash redemption amount.

+ References

No definition available.

+ Details

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X

- Definition

Change in noncontrolling interest during the period as a result of a change in the redemption value of redeemable noncontrolling interest.

+ References

No definition available.

+ Details

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- Details

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X

- Definition

The number of units or equivalent units outstanding for all classes.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 272

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 5

-Subparagraph (SAB TOPIC 4.F)

-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187171-122770

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