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INVESTMENT ACTIVITY (Details) | 12 Months Ended | 0 Months Ended | 1 Months Ended | 12 Months Ended | 0 Months Ended |  | 0 Months Ended | 12 Months Ended |  |  |  | 12 Months Ended | 3 Months Ended | 12 Months Ended | 0 Months Ended |  | 12 Months Ended | 0 Months Ended | 12 Months Ended |  | 12 Months Ended
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Dec. 31, 2014 USD ($) property | Dec. 31, 2013 USD ($) | Dec. 31, 2012 USD ($) | Jun. 30, 2014 USIFB, LLP | Jun. 30, 2014 USIFB, LLP facility | Dec. 31, 2014 USIFB, LLP | Dec. 31, 2008 USIFB, LLP | Sep. 28, 2012 HSRE Venture USD ($) | Sep. 26, 2011 HSRE Venture property | Sep. 28, 2012 HSRE Venture | Nov. 03, 2014 HSRE USD ($) facility | Aug. 25, 2014 HSRE property | Dec. 31, 2014 HSRE USD ($) | Nov. 03, 2014 HSRE USD ($) | Aug. 25, 2014 HSRE USD ($) | Dec. 31, 2014 5 Old Lancaster Road located in Malvern, PA USD ($) | Dec. 31, 2014 Bronx, NY USD ($) | Dec. 31, 2014 Self-storage facilities located in New York and Virginia USD ($) facility | Dec. 31, 2014 Self-storage facilities located in New York USD ($) facility | Dec. 31, 2014 Self-storage facilities located in New York USD ($) facility | Dec. 31, 2014 Self-storage facility located in Virginia facility | Jun. 30, 2014 Asset in London, England USIFB, LLP USD ($) property | Jun. 30, 2014 Asset in London, England USIFB, LLP USD ($) | Jun. 30, 2014 Asset in London, England USIFB, LLP GBP (£) | Dec. 31, 2014 Real Estate Acquisition Expected by 2016 USD ($) | Dec. 31, 2014 Self-storage facilities USD ($) property | Dec. 31, 2013 Self-storage facilities USD ($) property | Dec. 31, 2012 Self-storage facilities USD ($) property | Dec. 31, 2014 Self-storage facilities 2014 Acquisitions USD ($) property | Dec. 31, 2014 Self-storage facilities 2013 Acquisitions USD ($) | Dec. 31, 2013 Self-storage facilities 2013 Acquisitions USD ($) property | Dec. 31, 2013 Self-storage facilities 2012 Self-storage facilities acquisitions USD ($) | Dec. 31, 2012 Self-storage facilities 2012 Self-storage facilities acquisitions USD ($) property | Sep. 28, 2012 Self-storage facilities 2012 Self-storage facilities acquisitions HSRE Venture USD ($) property | Dec. 31, 2013 Self-storage facilities 2012 Self-storage facilities acquisitions HSRE Venture USD ($) | Dec. 31, 2012 Self-storage facilities 2012 Self-storage facilities acquisitions HSRE Venture USD ($) | Sep. 28, 2012 Self-storage facilities 2012 Self-storage facilities acquisitions HSRE Venture USD ($) | Dec. 31, 2013 Self-storage facilities 2012 Self-storage facilities acquisitions Storage Deluxe assets USD ($) | Dec. 31, 2012 Self-storage facilities 2012 Self-storage facilities acquisitions Storage Deluxe assets USD ($) property facility
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Development costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 25,100,000us-gaap_DevelopmentInProcess / cube_ScheduleOfRealEstateInvestmentPropertyAxis = cube_Old5LancasterRoadMalvernPAMember | $ 17,200,000us-gaap_DevelopmentInProcess / cube_ScheduleOfRealEstateInvestmentPropertyAxis = cube_BronxNYMember | $ 35,400,000us-gaap_DevelopmentInProcess / cube_ScheduleOfRealEstateInvestmentPropertyAxis = cube_SelfStorageFacilitiesInNewYorkAndVirginiaMember | $ 400,000us-gaap_DevelopmentInProcess / cube_ScheduleOfRealEstateInvestmentPropertyAxis = cube_SelfStorageFacilitiesInNewYorkMember | $ 400,000us-gaap_DevelopmentInProcess / cube_ScheduleOfRealEstateInvestmentPropertyAxis = cube_SelfStorageFacilitiesInNewYorkMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of Storage Deluxe transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 560,000,000cube_AmountOfStorageDeluxeTransaction / cube_ScheduleOfRealEstateInvestmentPropertyAxis = cube_StorageDeluxeAssetsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cube_RealEstateAcquisition2012Member / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember
Number of self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4cube_NumberOfSelfStorageFacilities / cube_ScheduleOfRealEstateInvestmentPropertyAxis = cube_SelfStorageFacilitiesInNewYorkAndVirginiaMember | 1cube_NumberOfSelfStorageFacilities / cube_ScheduleOfRealEstateInvestmentPropertyAxis = cube_SelfStorageFacilitiesInNewYorkMember | 3cube_NumberOfSelfStorageFacilities / cube_ScheduleOfRealEstateInvestmentPropertyAxis = cube_SelfStorageFacilitiesInNewYorkMember | 1cube_NumberOfSelfStorageFacilities / cube_ScheduleOfRealEstateInvestmentPropertyAxis = cube_SelfStorageFacilityInVirginiaMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 22cube_NumberOfSelfStorageFacilities / cube_ScheduleOfRealEstateInvestmentPropertyAxis = cube_StorageDeluxeAssetsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cube_RealEstateAcquisition2012Member / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember
Number of self-storage facilities acquired (in properties) |  |  |  |  |  |  |  |  | 9cube_NumberOfRealEstatePropertiesAcquired / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cube_HSREVentureMember |  |  | 26cube_NumberOfRealEstatePropertiesAcquired / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cube_HSREMember |  |  |  |  |  |  |  |  |  |  |  |  |  | 53cube_NumberOfRealEstatePropertiesAcquired / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember |  |  | 31cube_NumberOfRealEstatePropertiesAcquired / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cube_RealEstateAcquisition2014Member / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember |  | 20cube_NumberOfRealEstatePropertiesAcquired / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cube_RealEstateAcquisition2013Member / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember |  | 22cube_NumberOfRealEstatePropertiesAcquired / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cube_RealEstateAcquisition2012Member / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember | 9cube_NumberOfRealEstatePropertiesAcquired / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cube_HSREVentureMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cube_RealEstateAcquisition2012Member / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember |  |  |  |  | 6cube_NumberOfRealEstatePropertiesAcquired / cube_ScheduleOfRealEstateInvestmentPropertyAxis = cube_StorageDeluxeAssetsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cube_RealEstateAcquisition2012Member / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember
Aggregate purchase or sale price |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 223,000,000us-gaap_SignificantAcquisitionsAndDisposalsAcquisitionCostsOrSaleProceeds / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cube_HSREMember |  |  |  |  |  |  |  | 7,000,000us-gaap_SignificantAcquisitionsAndDisposalsAcquisitionCostsOrSaleProceeds / cube_ScheduleOfRealEstateInvestmentPropertyAxis = cube_AssetInLondonEnglandMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = cube_USIFBLLPJointVentureMember | 4,100,000us-gaap_SignificantAcquisitionsAndDisposalsAcquisitionCostsOrSaleProceeds / cube_ScheduleOfRealEstateInvestmentPropertyAxis = cube_AssetInLondonEnglandMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = cube_USIFBLLPJointVentureMember |  | 568,200,000us-gaap_SignificantAcquisitionsAndDisposalsAcquisitionCostsOrSaleProceeds / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember | 126,400,000us-gaap_SignificantAcquisitionsAndDisposalsAcquisitionCostsOrSaleProceeds / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember | 60,000,000us-gaap_SignificantAcquisitionsAndDisposalsAcquisitionCostsOrSaleProceeds / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember | 372,700,000us-gaap_SignificantAcquisitionsAndDisposalsAcquisitionCostsOrSaleProceeds / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cube_RealEstateAcquisition2014Member / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember |  | 189,800,000us-gaap_SignificantAcquisitionsAndDisposalsAcquisitionCostsOrSaleProceeds / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cube_RealEstateAcquisition2013Member / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember |  | 128,400,000us-gaap_SignificantAcquisitionsAndDisposalsAcquisitionCostsOrSaleProceeds / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cube_RealEstateAcquisition2012Member / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember |  |  |  |  |  | 201,900,000us-gaap_SignificantAcquisitionsAndDisposalsAcquisitionCostsOrSaleProceeds / cube_ScheduleOfRealEstateInvestmentPropertyAxis = cube_StorageDeluxeAssetsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cube_RealEstateAcquisition2012Member / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember
Intangible value of the in-place leases |  |  |  |  |  |  |  |  |  |  |  |  |  | 14,500,000cube_RealEstatePropertiesAcquiredIntangibleLeaseAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cube_HSREMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 23,800,000cube_RealEstatePropertiesAcquiredIntangibleLeaseAssets / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cube_RealEstateAcquisition2014Member / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember |  | 13,500,000cube_RealEstatePropertiesAcquiredIntangibleLeaseAssets / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cube_RealEstateAcquisition2013Member / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember |  | 13,200,000cube_RealEstatePropertiesAcquiredIntangibleLeaseAssets / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cube_RealEstateAcquisition2012Member / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember |  |  |  | 8,300,000cube_RealEstatePropertiesAcquiredIntangibleLeaseAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cube_HSREVentureMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cube_RealEstateAcquisition2012Member / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember |  | 12,300,000cube_RealEstatePropertiesAcquiredIntangibleLeaseAssets / cube_ScheduleOfRealEstateInvestmentPropertyAxis = cube_StorageDeluxeAssetsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cube_RealEstateAcquisition2012Member / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember
Estimated life |  |  |  |  |  |  |  |  |  |  | 12 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 months |  | 12 months |  | 12 months | 12 months |  |  |  |  | 12 months
Amortization expense |  |  |  |  |  |  |  |  |  |  |  |  | 2,400,000us-gaap_AmortizationOfIntangibleAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cube_HSREMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13,400,000us-gaap_AmortizationOfIntangibleAssets / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cube_RealEstateAcquisition2014Member / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember | 8,200,000us-gaap_AmortizationOfIntangibleAssets / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cube_RealEstateAcquisition2013Member / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember | 5,300,000us-gaap_AmortizationOfIntangibleAssets / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cube_RealEstateAcquisition2013Member / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember | 8,400,000us-gaap_AmortizationOfIntangibleAssets / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cube_RealEstateAcquisition2012Member / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember | 4,800,000us-gaap_AmortizationOfIntangibleAssets / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cube_RealEstateAcquisition2012Member / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember |  | 6,200,000us-gaap_AmortizationOfIntangibleAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cube_HSREVentureMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cube_RealEstateAcquisition2012Member / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember | 2,100,000us-gaap_AmortizationOfIntangibleAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cube_HSREVentureMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cube_RealEstateAcquisition2012Member / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember |  | 4,400,000us-gaap_AmortizationOfIntangibleAssets / cube_ScheduleOfRealEstateInvestmentPropertyAxis = cube_StorageDeluxeAssetsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cube_RealEstateAcquisition2012Member / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember | 7,900,000us-gaap_AmortizationOfIntangibleAssets / cube_ScheduleOfRealEstateInvestmentPropertyAxis = cube_StorageDeluxeAssetsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cube_RealEstateAcquisition2012Member / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember
Number of properties, assumed mortgage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4cube_NumberOfRealEstatePropertiesAcquiredMortgagesAssumed / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cube_RealEstateAcquisition2014Member / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember |  | 1cube_NumberOfRealEstatePropertiesAcquiredMortgagesAssumed / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cube_RealEstateAcquisition2013Member / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember |  | 2cube_NumberOfRealEstatePropertiesAcquiredMortgagesAssumed / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cube_RealEstateAcquisition2012Member / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember |  |  |  |  |  |
Assumed mortgage debt, at fair value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 27,500,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cube_RealEstateAcquisition2014Member / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember |  | 8,900,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cube_RealEstateAcquisition2013Member / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember |  | 13,900,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cube_RealEstateAcquisition2012Member / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember |  |  |  |  |  | 93,100,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt / cube_ScheduleOfRealEstateInvestmentPropertyAxis = cube_StorageDeluxeAssetsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cube_RealEstateAcquisition2012Member / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember
Outstanding principal balance of mortgage debt assumed on acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 26,000,000cube_RealEstatePropertiesDebtAssumedOnAcquisition / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cube_RealEstateAcquisition2014Member / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember |  | 8,500,000cube_RealEstatePropertiesDebtAssumedOnAcquisition / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cube_RealEstateAcquisition2013Member / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember |  | 13,400,000cube_RealEstatePropertiesDebtAssumedOnAcquisition / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cube_RealEstateAcquisition2012Member / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember |  |  |  |  |  | 88,900,000cube_RealEstatePropertiesDebtAssumedOnAcquisition / cube_ScheduleOfRealEstateInvestmentPropertyAxis = cube_StorageDeluxeAssetsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cube_RealEstateAcquisition2012Member / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember
Premium on debt assumed on acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,500,000cube_RealEstatePropertiesPremiumOnDebtAssumed / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cube_RealEstateAcquisition2014Member / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember |  | 400,000cube_RealEstatePropertiesPremiumOnDebtAssumed / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cube_RealEstateAcquisition2013Member / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember |  | 500,000cube_RealEstatePropertiesPremiumOnDebtAssumed / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cube_RealEstateAcquisition2012Member / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember |  |  |  |  |  | 4,200,000cube_RealEstatePropertiesPremiumOnDebtAssumed / cube_ScheduleOfRealEstateInvestmentPropertyAxis = cube_StorageDeluxeAssetsMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cube_RealEstateAcquisition2012Member / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember
Number of facilities closed |  |  |  |  |  |  |  |  |  |  | 22cube_NumberOfFacilitiesClosed / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cube_HSREMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate purchase price of facilities closed |  |  |  |  |  |  |  |  |  |  | 195,500,000cube_SignificantAcquisitionsAndDisposalsAggregatePurchasePriceOfClosedFacilities / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cube_HSREMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of facilities not yet closed |  |  |  |  |  |  |  |  |  |  | 4cube_NumberOfFacilitiesNotYetClosed / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cube_HSREMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deposit |  |  |  |  |  |  |  |  |  |  |  |  | 5,000,000us-gaap_DepositAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cube_HSREMember |  |  |  |  |  |  |  |  |  |  |  | 5,200,000us-gaap_DepositAssets / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cube_RealEstateAcquisitionExpectedIn2016Member |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of facilities under contract |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4cube_NumberOfFacilitiesUnderContract / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cube_RealEstateAcquisitionExpectedIn2016Member |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of assets sold | 1cube_NumberOfRealEstatePropertiesSold |  |  |  | 1cube_NumberOfRealEstatePropertiesSold / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = cube_USIFBLLPJointVentureMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1cube_NumberOfRealEstatePropertiesSold / cube_ScheduleOfRealEstateInvestmentPropertyAxis = cube_AssetInLondonEnglandMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = cube_USIFBLLPJointVentureMember |  |  |  |  | 35cube_NumberOfRealEstatePropertiesSold / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember | 26cube_NumberOfRealEstatePropertiesSold / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember |  |  |  |  |  |  |  |  |  |  |
Ownership interest held by the entity (as a percent) |  |  |  | 97.00%us-gaap_VariableInterestEntityOwnershipPercentage / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = cube_USIFBLLPJointVentureMember |  | 97.00%us-gaap_VariableInterestEntityOwnershipPercentage / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = cube_USIFBLLPJointVentureMember | 97.00%us-gaap_VariableInterestEntityOwnershipPercentage / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = cube_USIFBLLPJointVentureMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from sale of assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,000,000us-gaap_ProceedsFromSaleOfRealEstate / cube_ScheduleOfRealEstateInvestmentPropertyAxis = cube_AssetInLondonEnglandMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = cube_USIFBLLPJointVentureMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain from sale of real estate | 475,000us-gaap_GainLossOnSaleOfProperties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 500,000us-gaap_GainLossOnSaleOfProperties / cube_ScheduleOfRealEstateInvestmentPropertyAxis = cube_AssetInLondonEnglandMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = cube_USIFBLLPJointVentureMember |  |  |  |  | 27,400,000us-gaap_GainLossOnSaleOfProperties / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember | 9,800,000us-gaap_GainLossOnSaleOfProperties / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember |  |  |  |  |  |  |  |  |  |  |
Expected aggregate purchase or sales price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 85,200,000cube_SignificantAcquisitionsAndDisposalsExpectedAcquisitionCostsOrSaleProceeds / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cube_RealEstateAcquisitionExpectedIn2016Member |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition of remaining interest in real estate ventures (as a percent) |  |  |  |  |  |  |  |  |  | 50.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cube_HSREVentureMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cube_HSREVentureMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cube_RealEstateAcquisition2012Member / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember |  |
Cash paid for acquisition of remaining interest in real estate ventures |  |  |  |  |  |  |  | 21,700,000us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cube_HSREVentureMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 21,700,000us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cube_HSREVentureMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cube_RealEstateAcquisition2012Member / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember |  |  |  |  |
Repayments of debt |  |  |  |  |  |  |  | 59,300,000us-gaap_RepaymentsOfDebt / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cube_HSREVentureMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 59,300,000us-gaap_RepaymentsOfDebt / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cube_HSREVentureMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cube_RealEstateAcquisition2012Member / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember |  |  |  |  |
Fair value of storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 102,000,000us-gaap_PropertyPlantAndEquipmentFairValueDisclosure / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cube_HSREVentureMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = cube_RealEstateAcquisition2012Member / cube_SignificantAcquisitionsAndDisposalsByTypeAxis = us-gaap_RealEstateMember |  |
Summary of the amounts of revenue and earnings of the 2014 and 2013 acquisitions since the acquisition dates |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue | 21,156,000us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual | 7,048,000us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual | 19,028,000us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss | $ (12,350,000)us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual | $ (4,228,000)us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual | $ (11,464,000)us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

X
- Definition Represents the transaction amount involving Class A self-storage facilities. + References No definition available. + Details
Name: | cube_AmountOfStorageDeluxeTransaction
Namespace Prefix: | cube_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | cube_BusinessAcquisitionProFormaInformationOfAcquireeSinceAcquisitionDateActualAbstract
Namespace Prefix: | cube_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of facilities closed. + References No definition available. + Details
Name: | cube_NumberOfFacilitiesClosed
Namespace Prefix: | cube_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of facilities not yet closed. + References No definition available. + Details
Name: | cube_NumberOfFacilitiesNotYetClosed
Namespace Prefix: | cube_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the number of facilities under contract. + References No definition available. + Details
Name: | cube_NumberOfFacilitiesUnderContract
Namespace Prefix: | cube_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the number of real estate properties that were acquired. + References No definition available. + Details
Name: | cube_NumberOfRealEstatePropertiesAcquired
Namespace Prefix: | cube_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of real estate acquired properties of which mortgages were assumed. + References No definition available. + Details
Name: | cube_NumberOfRealEstatePropertiesAcquiredMortgagesAssumed
Namespace Prefix: | cube_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of real estate properties that were sold. + References No definition available. + Details
Name: | cube_NumberOfRealEstatePropertiesSold
Namespace Prefix: | cube_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of self-storage facilities involved in transaction. + References No definition available. + Details
Name: | cube_NumberOfSelfStorageFacilities
Namespace Prefix: | cube_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the intangible lease assets recorded as part of the real estate acquisition. + References No definition available. + Details
Name: | cube_RealEstatePropertiesAcquiredIntangibleLeaseAssets
Namespace Prefix: | cube_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the debt assumed on real estate acquisition. + References No definition available. + Details
Name: | cube_RealEstatePropertiesDebtAssumedOnAcquisition
Namespace Prefix: | cube_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the premium on debt assumed on real estate acquisition. + References No definition available. + Details
Name: | cube_RealEstatePropertiesPremiumOnDebtAssumed
Namespace Prefix: | cube_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the amount of aggregate purchase price of facilities closed. + References No definition available. + Details
Name: | cube_SignificantAcquisitionsAndDisposalsAggregatePurchasePriceOfClosedFacilities
Namespace Prefix: | cube_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The expected value of all consideration given or received by the Entity in the significant acquisition or disposal. + References No definition available. + Details
Name: | cube_SignificantAcquisitionsAndDisposalsExpectedAcquisitionCostsOrSaleProceeds
Namespace Prefix: | cube_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
Name: | us-gaap_AmortizationOfIntangibleAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
Name: | us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition This element represents the amount of earnings or loss of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
Name: | us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
Name: | us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of long-term debt due after one year or the normal operating cycle, if longer, assumed at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 + Details
Name: | us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The carrying amount of the asset transferred to a third party to serve as a deposit, which typically serves as security against failure by the transferor to perform under terms of an agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 17 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 8 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.8,17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_DepositAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The current amount of expenditures for a real estate project that has not yet been completed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.10) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
Name: | us-gaap_DevelopmentInProcess
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- 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
Name: | us-gaap_FiniteLivedIntangibleAssetUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- 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/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
Name: | us-gaap_GainLossOnSaleOfProperties
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- 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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
Name: | us-gaap_PaymentsToAcquireBusinessesGross
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Cash received for the sale of real estate that is not part of an investing activity during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
Name: | us-gaap_ProceedsFromSaleOfRealEstate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Fair value portion of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19190-110258 + Details
Name: | us-gaap_PropertyPlantAndEquipmentFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- 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 No definition available. + Details
Name: | us-gaap_RepaymentsOfDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The value of all consideration given or received by the Entity in the significant acquisition or disposal. + References No definition available. + Details
Name: | us-gaap_SignificantAcquisitionsAndDisposalsAcquisitionCostsOrSaleProceeds
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_SignificantAcquisitionsAndDisposalsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 5A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=28200181&loc=SL6759159-111685 + Details
Name: | us-gaap_VariableInterestEntityOwnershipPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration