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ORGANIZATION AND NATURE OF OPERATIONS (Details) | 12 Months Ended
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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