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RELATED PARTY TRANSACTIONS (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
RELATED PARTY TRANSACTIONS |  |  |
Area of corporate office (in acres) | 50cube_AcreageOfRealEstateProperty |  |
Lease agreements with related parties | CubeSmart, L.P. and Subsidiaries | Office space subject to lease |  |  |
RELATED PARTY TRANSACTIONS |  |  |
Aggregate amount of lease payments incurred | $ 500,000cube_PaymentsForLeaseRentToRelatedParty / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = us-gaap_PropertySubjectToOperatingLeaseMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = cube_RelatedPartyMember | $ 500,000cube_PaymentsForLeaseRentToRelatedParty / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = us-gaap_PropertySubjectToOperatingLeaseMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = cube_RelatedPartyMember | $ 500,000cube_PaymentsForLeaseRentToRelatedParty / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = us-gaap_PropertySubjectToOperatingLeaseMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = cube_RelatedPartyMember
Lease agreements with related parties | CubeSmart, L.P. and Subsidiaries | The Parkview Building 6745 Engle Road; and 6751 Engle Road |  |  |
RELATED PARTY TRANSACTIONS |  |  |
Approximate Square Footage | 21,900cube_SquareFootageOfRealEstatePropertyLeased / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = cube_ParkviewBuilding6745EngleRoadAnd6751EngleRoadMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = cube_RelatedPartyMember |  |
Lease agreements with related parties | CubeSmart, L.P. and Subsidiaries | The Parkview Building 6745 Engle Road; and 6751 Engle Road | Minimum |  |  |
RELATED PARTY TRANSACTIONS |  |  |
Fixed rent per month | 25,673cube_RelatedPartyTransactionOperatingLeaseFixedRentDuePerMonth / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = cube_ParkviewBuilding6745EngleRoadAnd6751EngleRoadMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = cube_RelatedPartyMember |  |
Lease agreements with related parties | CubeSmart, L.P. and Subsidiaries | The Parkview Building 6745 Engle Road; and 6751 Engle Road | Maximum |  |  |
RELATED PARTY TRANSACTIONS |  |  |
Fixed rent per month | 31,205cube_RelatedPartyTransactionOperatingLeaseFixedRentDuePerMonth / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = cube_ParkviewBuilding6745EngleRoadAnd6751EngleRoadMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = cube_RelatedPartyMember |  |
Lease agreements with related parties | CubeSmart, L.P. and Subsidiaries | 6745 Engle Road Suite 100 |  |  |
RELATED PARTY TRANSACTIONS |  |  |
Approximate Square Footage | 2,212cube_SquareFootageOfRealEstatePropertyLeased / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = cube_EngleRoad6745Suite100Member / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = cube_RelatedPartyMember |  |
Lease agreements with related parties | CubeSmart, L.P. and Subsidiaries | 6745 Engle Road Suite 100 | Minimum |  |  |
RELATED PARTY TRANSACTIONS |  |  |
Fixed rent per month | 3,051cube_RelatedPartyTransactionOperatingLeaseFixedRentDuePerMonth / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = cube_EngleRoad6745Suite100Member / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = cube_RelatedPartyMember |  |
Lease agreements with related parties | CubeSmart, L.P. and Subsidiaries | 6745 Engle Road Suite 100 | Maximum |  |  |
RELATED PARTY TRANSACTIONS |  |  |
Fixed rent per month | 3,709cube_RelatedPartyTransactionOperatingLeaseFixedRentDuePerMonth / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = cube_EngleRoad6745Suite100Member / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = cube_RelatedPartyMember |  |
Lease agreements with related parties | CubeSmart, L.P. and Subsidiaries | 6745 Engle Road Suite 110 |  |  |
RELATED PARTY TRANSACTIONS |  |  |
Approximate Square Footage | 1,731cube_SquareFootageOfRealEstatePropertyLeased / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = cube_EngleRoad6745Suite110Member / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = cube_RelatedPartyMember |  |
Lease agreements with related parties | CubeSmart, L.P. and Subsidiaries | 6745 Engle Road Suite 110 | Minimum |  |  |
RELATED PARTY TRANSACTIONS |  |  |
Fixed rent per month | 2,387cube_RelatedPartyTransactionOperatingLeaseFixedRentDuePerMonth / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = cube_EngleRoad6745Suite110Member / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = cube_RelatedPartyMember |  |
Lease agreements with related parties | CubeSmart, L.P. and Subsidiaries | 6745 Engle Road Suite 110 | Maximum |  |  |
RELATED PARTY TRANSACTIONS |  |  |
Fixed rent per month | 2,901cube_RelatedPartyTransactionOperatingLeaseFixedRentDuePerMonth / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = cube_EngleRoad6745Suite110Member / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = cube_RelatedPartyMember |  |
Lease agreements with related parties | CubeSmart, L.P. and Subsidiaries | 6751 Engle Road Suites C and D |  |  |
RELATED PARTY TRANSACTIONS |  |  |
Approximate Square Footage | 3,000cube_SquareFootageOfRealEstatePropertyLeased / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = cube_EngleRoad6751SuitesCAndDMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = cube_RelatedPartyMember |  |
Lease agreements with related parties | CubeSmart, L.P. and Subsidiaries | 6751 Engle Road Suites C and D | Minimum |  |  |
RELATED PARTY TRANSACTIONS |  |  |
Fixed rent per month | 3,137cube_RelatedPartyTransactionOperatingLeaseFixedRentDuePerMonth / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = cube_EngleRoad6751SuitesCAndDMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = cube_RelatedPartyMember |  |
Lease agreements with related parties | CubeSmart, L.P. and Subsidiaries | 6751 Engle Road Suites C and D | Maximum |  |  |
RELATED PARTY TRANSACTIONS |  |  |
Fixed rent per month | 3,771cube_RelatedPartyTransactionOperatingLeaseFixedRentDuePerMonth / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = cube_EngleRoad6751SuitesCAndDMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = cube_RelatedPartyMember |  |
Joint ventures related to affiliated real estate investments |  |  |
RELATED PARTY TRANSACTIONS |  |  |
Management fee | 900,000us-gaap_ManagementFeeExpense / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = cube_RealEstateInvestmentsRelatedJointVenturesMember | 100,000us-gaap_ManagementFeeExpense / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = cube_RealEstateInvestmentsRelatedJointVenturesMember | 200,000us-gaap_ManagementFeeExpense / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = cube_RealEstateInvestmentsRelatedJointVenturesMember
Amount due to the entity from joint venture | 1,600,000us-gaap_DueFromJointVentures / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = cube_RealEstateInvestmentsRelatedJointVenturesMember | 2,100,000us-gaap_DueFromJointVentures / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = cube_RealEstateInvestmentsRelatedJointVenturesMember |
Mortgage loans receivable from consolidated joint ventures | $ 10,800,000us-gaap_DueFromJointVenturesNoncurrent / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = cube_RealEstateInvestmentsRelatedJointVenturesMember | $ 15,800,000us-gaap_DueFromJointVenturesNoncurrent / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = cube_RealEstateInvestmentsRelatedJointVenturesMember |
Joint ventures related to affiliated real estate investments | Minimum |  |  |
RELATED PARTY TRANSACTIONS |  |  |
Management fee (as a percent) | 5.00%us-gaap_PropertyManagementFeePercentFee / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = cube_RealEstateInvestmentsRelatedJointVenturesMember |  |
Joint ventures related to affiliated real estate investments | Maximum |  |  |
RELATED PARTY TRANSACTIONS |  |  |
Management fee (as a percent) | 6.00%us-gaap_PropertyManagementFeePercentFee / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = cube_RealEstateInvestmentsRelatedJointVenturesMember |  |

X
- Definition Represents the number of acres of the real estate property. + References No definition available. + Details
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Namespace Prefix: | cube_
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Balance Type: | na
Period Type: | duration

X
- Definition Payments of cash for lease rent to the related party. + References No definition available. + Details
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Balance Type: | credit
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- Definition Represents the operating lease fixed rent due per month to the related party. + References No definition available. + Details
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X
- Definition Represents the area of the real estate property subject to an operating lease. + References No definition available. + Details
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Balance Type: | na
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- Definition For an unclassified balance sheet, amounts due from an entity in which the reporting entity shares joint control with another party or group. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(k)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph k -Subparagraph 1 -Article 4 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 3 -Article 7 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39599-107864 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.3) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39622-107864 + Details
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- Definition Amounts due from an entity in which the reporting entity shares joint control with another party or group, due after 1 year (or 1 business cycle). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(k)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3 -Subparagraph a -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph k -Subparagraph 1 -Article 4 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.11) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39599-107864 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39622-107864 + Details
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- Definition Amount of expenses related to the managing member or general partner for management of the day-to-day business functions of the limited liability company (LLC) or limited partnership (LP). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 + Details
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