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ORGANIZATION AND NATURE OF OPERATIONS (Details)	12 Months Ended
	Dec. 31, 2014 segment state
ORGANIZATION AND NATURE OF OPERATIONS
Number of states in which self-storage facilities are located	22us-gaap_NumberOfStatesInWhichEntityOperates
Number of reportable segments	1us-gaap_NumberOfReportableSegments
Percentage of the entity's partnership interest in Operating Partnership	98.60%us-gaap_MinorityInterestOwnershipPercentageByParent
Common stock, conversion ratio	1cube_CommonStockConversionRatio

X

- Definition

The shares of common stock into which another convertible security can be converted, or shares of common stock into which another class of common stock can be converted.

+ References

No definition available.

+ Details

Name:	cube_CommonStockConversionRatio
Namespace Prefix:	cube_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	cube_OrganizationAndNatureOfOperationsDisclosureAbstract
Namespace Prefix:	cube_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

+ References

No definition available.

+ Details

Name:	us-gaap_MinorityInterestOwnershipPercentageByParent
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfReportableSegments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The number of states the entity operates in as of the balance sheet date.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfStatesInWhichEntityOperates
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant