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REVOLVING CREDIT FACILITY AND UNSECURED TERM LOANS (Details) (USD $) | 12 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended |
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Dec. 31, 2013 | Jun. 18, 2013 | Aug. 05, 2014 | Jun. 20, 2011 | Dec. 31, 2014 | Dec. 17, 2013 | Dec. 09, 2011
SECURED CREDIT FACILITY, UNSECURED CREDIT FACILITY AND SECURED TERM LOANS |  |  |  |  |  |  |
Loan procurement costs capitalized | $ 17,300,000us-gaap_DeferredFinanceCostsGross |  |  |  | 17,000,000us-gaap_DeferredFinanceCostsGross |  |
Loan procurement amortization expense - early repayment of debt | 414,000us-gaap_WriteOffOfDeferredDebtIssuanceCost |  |  |  |  |  |
Unsecured term loan borrowings outstanding | 400,000,000us-gaap_UnsecuredDebt |  |  |  | 400,000,000us-gaap_UnsecuredDebt |  |
Term Loan A |  |  |  |  |  |  |
SECURED CREDIT FACILITY, UNSECURED CREDIT FACILITY AND SECURED TERM LOANS |  |  |  |  |  |  |
Maximum borrowing capacity |  | 100,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_LongtermDebtTypeAxis = cube_TermLoanOneMember |  |  |  |  |
Term Loan B |  |  |  |  |  |  |
SECURED CREDIT FACILITY, UNSECURED CREDIT FACILITY AND SECURED TERM LOANS |  |  |  |  |  |  |
Maximum borrowing capacity |  | 100,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_LongtermDebtTypeAxis = cube_TermLoanTwoMember |  |  |  |  |
Term Loan Facility, Prior to Amendment | Term Loan A | Baa3/BBB |  |  |  |  |  |  |
SECURED CREDIT FACILITY, UNSECURED CREDIT FACILITY AND SECURED TERM LOANS |  |  |  |  |  |  |
Interest rate, basis spread (as a percent) |  | 1.85%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditRatingMoodysAxis = us-gaap_MoodysBaa3RatingMember / us-gaap_DebtInstrumentAxis = cube_TermLoanFacilityPriorToAmendmentMember / us-gaap_LongtermDebtTypeAxis = cube_TermLoanOneMember |  |  |  |  |
Term Loan Facility, Prior to Amendment | Term Loan A | Baa2/BBB |  |  |  |  |  |  |
SECURED CREDIT FACILITY, UNSECURED CREDIT FACILITY AND SECURED TERM LOANS |  |  |  |  |  |  |
Interest rate, basis spread (as a percent) |  | 1.65%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditRatingMoodysAxis = us-gaap_MoodysBaa2RatingMember / us-gaap_DebtInstrumentAxis = cube_TermLoanFacilityPriorToAmendmentMember / us-gaap_LongtermDebtTypeAxis = cube_TermLoanOneMember |  |  |  |  |
Term Loan Facility, Prior to Amendment | Term Loan B | Baa3/BBB |  |  |  |  |  |  |
SECURED CREDIT FACILITY, UNSECURED CREDIT FACILITY AND SECURED TERM LOANS |  |  |  |  |  |  |
Interest rate, basis spread (as a percent) |  | 2.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditRatingMoodysAxis = us-gaap_MoodysBaa3RatingMember / us-gaap_DebtInstrumentAxis = cube_TermLoanFacilityPriorToAmendmentMember / us-gaap_LongtermDebtTypeAxis = cube_TermLoanTwoMember |  |  |  |  |
Term Loan Facility, Prior to Amendment | Term Loan B | Baa2/BBB |  |  |  |  |  |  |
SECURED CREDIT FACILITY, UNSECURED CREDIT FACILITY AND SECURED TERM LOANS |  |  |  |  |  |  |
Interest rate, basis spread (as a percent) |  | 1.80%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditRatingMoodysAxis = us-gaap_MoodysBaa2RatingMember / us-gaap_DebtInstrumentAxis = cube_TermLoanFacilityPriorToAmendmentMember / us-gaap_LongtermDebtTypeAxis = cube_TermLoanTwoMember |  |  |  |  |
Term Loan Facility, As Amended | Term Loan A | Baa3/BBB |  |  |  |  |  |  |
SECURED CREDIT FACILITY, UNSECURED CREDIT FACILITY AND SECURED TERM LOANS |  |  |  |  |  |  |
Interest rate, basis spread (as a percent) |  |  | 1.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditRatingMoodysAxis = us-gaap_MoodysBaa3RatingMember / us-gaap_DebtInstrumentAxis = cube_TermLoanFacilityAmendedMember / us-gaap_LongtermDebtTypeAxis = cube_TermLoanOneMember |  |  |  |
Term Loan Facility, As Amended | Term Loan B | Baa3/BBB |  |  |  |  |  |  |
SECURED CREDIT FACILITY, UNSECURED CREDIT FACILITY AND SECURED TERM LOANS |  |  |  |  |  |  |
Interest rate, basis spread (as a percent) |  |  | 1.40%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditRatingMoodysAxis = us-gaap_MoodysBaa3RatingMember / us-gaap_DebtInstrumentAxis = cube_TermLoanFacilityAmendedMember / us-gaap_LongtermDebtTypeAxis = cube_TermLoanTwoMember |  |  |  |
Term Loan Facility |  |  |  |  |  |  |
SECURED CREDIT FACILITY, UNSECURED CREDIT FACILITY AND SECURED TERM LOANS |  |  |  |  |  |  |
Loan procurement costs capitalized |  | 2,100,000us-gaap_DeferredFinanceCostsGross / us-gaap_DebtInstrumentAxis = cube_TermLoanFacilityMember | 200,000us-gaap_DeferredFinanceCostsGross / us-gaap_DebtInstrumentAxis = cube_TermLoanFacilityMember |  |  |  |
Effective weighted average interest rate (as a percent) | 3.22%us-gaap_DebtWeightedAverageInterestRate / us-gaap_DebtInstrumentAxis = cube_TermLoanFacilityMember |  |  |  |  |  |
Net proceeds from equity issuances added to minimum tangible net worth (as a percent) | 75.00%cube_DebtInstrumentCovenantPercentageOfProceedsFromEquityIssuancesAddedToTangibleNetWorth / us-gaap_DebtInstrumentAxis = cube_TermLoanFacilityMember |  |  |  |  |  |
Term Loan Facility | Interest rate swap |  |  |  |  |  |  |
SECURED CREDIT FACILITY, UNSECURED CREDIT FACILITY AND SECURED TERM LOANS |  |  |  |  |  |  |
Derivative, variable interest rate base | Thirty day LIBOR |  |  |  |  |  |
Term Loan Facility | Minimum |  |  |  |  |  |  |
SECURED CREDIT FACILITY, UNSECURED CREDIT FACILITY AND SECURED TERM LOANS |  |  |  |  |  |  |
Fixed charge coverage ratio | 1.5cube_DebtInstrumentCovenantFixedChargeCoverageRatio / us-gaap_DebtInstrumentAxis = cube_TermLoanFacilityMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |  |  |
Tangible net worth | 821,211,200cube_DebtInstrumentCovenantTangibleNetWorth / us-gaap_DebtInstrumentAxis = cube_TermLoanFacilityMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |  |  |
Term Loan Facility | Maximum |  |  |  |  |  |  |
SECURED CREDIT FACILITY, UNSECURED CREDIT FACILITY AND SECURED TERM LOANS |  |  |  |  |  |  |
Total indebtedness to total asset value ratio (as a percent) | 60.00%cube_DebtInstrumentCovenantTotalIndebtednessToTotalAssetValueRatio / us-gaap_DebtInstrumentAxis = cube_TermLoanFacilityMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |  |  |
Percentage of funds from operations that can be distributed on common shares | 95.00%cube_DebtInstrumentDistributionOnCommonSharesAsPercentageOfFundsFromOperationsCovenantCompliance / us-gaap_DebtInstrumentAxis = cube_TermLoanFacilityMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |  |  |
Term Loan Facility | Term Loan A |  |  |  |  |  |  |
SECURED CREDIT FACILITY, UNSECURED CREDIT FACILITY AND SECURED TERM LOANS |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  | 100,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = cube_TermLoanFacilityMember / us-gaap_LongtermDebtTypeAxis = cube_TermLoanOneMember |  |  |
Term of debt instrument |  |  |  | 5 years |  |  |
Term Loan Facility | Term Loan A | Baa3/BBB |  |  |  |  |  |  |
SECURED CREDIT FACILITY, UNSECURED CREDIT FACILITY AND SECURED TERM LOANS |  |  |  |  |  |  |
Interest rate, basis spread (as a percent) |  |  |  |  | 1.30%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditRatingMoodysAxis = us-gaap_MoodysBaa3RatingMember / us-gaap_DebtInstrumentAxis = cube_TermLoanFacilityMember / us-gaap_LongtermDebtTypeAxis = cube_TermLoanOneMember |  |
Variable interest rate basis |  |  |  |  | LIBOR |  |
Variable interest rate floor (as a percent) |  |  |  |  | 0.00%cube_DebtInstrumentVariableRateBasisFloor / us-gaap_CreditRatingMoodysAxis = us-gaap_MoodysBaa3RatingMember / us-gaap_DebtInstrumentAxis = cube_TermLoanFacilityMember / us-gaap_LongtermDebtTypeAxis = cube_TermLoanOneMember |  |
Term Loan Facility | Term Loan B |  |  |  |  |  |  |
SECURED CREDIT FACILITY, UNSECURED CREDIT FACILITY AND SECURED TERM LOANS |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  | 100,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = cube_TermLoanFacilityMember / us-gaap_LongtermDebtTypeAxis = cube_TermLoanTwoMember |  |  |
Term of debt instrument |  |  |  | 7 years |  |  |
Term Loan Facility | Term Loan B | Baa3/BBB |  |  |  |  |  |  |
SECURED CREDIT FACILITY, UNSECURED CREDIT FACILITY AND SECURED TERM LOANS |  |  |  |  |  |  |
Interest rate, basis spread (as a percent) |  |  |  |  | 1.15%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditRatingMoodysAxis = us-gaap_MoodysBaa3RatingMember / us-gaap_DebtInstrumentAxis = cube_TermLoanFacilityMember / us-gaap_LongtermDebtTypeAxis = cube_TermLoanTwoMember |  |
Variable interest rate basis |  |  |  |  | LIBOR |  |
Variable interest rate floor (as a percent) |  |  |  |  | 0.00%cube_DebtInstrumentVariableRateBasisFloor / us-gaap_CreditRatingMoodysAxis = us-gaap_MoodysBaa3RatingMember / us-gaap_DebtInstrumentAxis = cube_TermLoanFacilityMember / us-gaap_LongtermDebtTypeAxis = cube_TermLoanTwoMember |  |
Term Loan Facility | Term Loan C |  |  |  |  |  |  |
SECURED CREDIT FACILITY, UNSECURED CREDIT FACILITY AND SECURED TERM LOANS |  |  |  |  |  |  |
Loan procurement amortization expense - early repayment of debt | 400,000us-gaap_WriteOffOfDeferredDebtIssuanceCost / us-gaap_DebtInstrumentAxis = cube_TermLoanFacilityMember / us-gaap_LongtermDebtTypeAxis = cube_UnsecuredTermLoanMaturityDecember2014Member |  |  |  |  |  |
Term Loan Facility | Unsecured term loan |  |  |  |  |  |  |
SECURED CREDIT FACILITY, UNSECURED CREDIT FACILITY AND SECURED TERM LOANS |  |  |  |  |  |  |
Unsecured term loan borrowings outstanding | 200,000,000us-gaap_UnsecuredDebt / us-gaap_DebtInstrumentAxis = cube_TermLoanFacilityMember / us-gaap_LongtermDebtTypeAxis = cube_UnsecuredTermLoanMember |  |  |  |  |  |
Credit Facility, Prior to Amendment | Revolver | Baa3/BBB |  |  |  |  |  |  |
SECURED CREDIT FACILITY, UNSECURED CREDIT FACILITY AND SECURED TERM LOANS |  |  |  |  |  |  |
Interest rate, basis spread (as a percent) |  | 1.80%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditRatingMoodysAxis = us-gaap_MoodysBaa3RatingMember / us-gaap_DebtInstrumentAxis = cube_PriorCreditFacilityMember / us-gaap_LongtermDebtTypeAxis = cube_UnsecuredRevolvingCreditFacilityMaturityDecember2015Member |  |  |  |  |
Credit Facility, Prior to Amendment | Revolver | Baa2/BBB |  |  |  |  |  |  |
SECURED CREDIT FACILITY, UNSECURED CREDIT FACILITY AND SECURED TERM LOANS |  |  |  |  |  |  |
Interest rate, basis spread (as a percent) |  | 1.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditRatingMoodysAxis = us-gaap_MoodysBaa2RatingMember / us-gaap_DebtInstrumentAxis = cube_PriorCreditFacilityMember / us-gaap_LongtermDebtTypeAxis = cube_UnsecuredRevolvingCreditFacilityMaturityDecember2015Member |  |  |  |  |
Credit Facility, Prior to Amendment | Term Loan C | Baa3/BBB |  |  |  |  |  |  |
SECURED CREDIT FACILITY, UNSECURED CREDIT FACILITY AND SECURED TERM LOANS |  |  |  |  |  |  |
Interest rate, basis spread (as a percent) |  | 1.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditRatingMoodysAxis = us-gaap_MoodysBaa3RatingMember / us-gaap_DebtInstrumentAxis = cube_PriorCreditFacilityMember / us-gaap_LongtermDebtTypeAxis = cube_UnsecuredTermLoanMaturityDecember2014Member |  |  |  |  |
Credit Facility, Prior to Amendment | Term Loan C | Baa2/BBB |  |  |  |  |  |  |
SECURED CREDIT FACILITY, UNSECURED CREDIT FACILITY AND SECURED TERM LOANS |  |  |  |  |  |  |
Interest rate, basis spread (as a percent) |  | 1.45%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditRatingMoodysAxis = us-gaap_MoodysBaa2RatingMember / us-gaap_DebtInstrumentAxis = cube_PriorCreditFacilityMember / us-gaap_LongtermDebtTypeAxis = cube_UnsecuredTermLoanMaturityDecember2014Member |  |  |  |  |
Credit Facility, Prior to Amendment | Term Loan D | Baa3/BBB |  |  |  |  |  |  |
SECURED CREDIT FACILITY, UNSECURED CREDIT FACILITY AND SECURED TERM LOANS |  |  |  |  |  |  |
Interest rate, basis spread (as a percent) |  | 1.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditRatingMoodysAxis = us-gaap_MoodysBaa3RatingMember / us-gaap_DebtInstrumentAxis = cube_PriorCreditFacilityMember / us-gaap_LongtermDebtTypeAxis = cube_UnsecuredTermLoanMaturityMarch2017Member |  |  |  |  |
Credit Facility, Prior to Amendment | Term Loan D | Baa2/BBB |  |  |  |  |  |  |
SECURED CREDIT FACILITY, UNSECURED CREDIT FACILITY AND SECURED TERM LOANS |  |  |  |  |  |  |
Interest rate, basis spread (as a percent) |  | 1.45%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditRatingMoodysAxis = us-gaap_MoodysBaa2RatingMember / us-gaap_DebtInstrumentAxis = cube_PriorCreditFacilityMember / us-gaap_LongtermDebtTypeAxis = cube_UnsecuredTermLoanMaturityMarch2017Member |  |  |  |  |
Credit Facility, As Amended | Revolver | Baa3/BBB |  |  |  |  |  |  |
SECURED CREDIT FACILITY, UNSECURED CREDIT FACILITY AND SECURED TERM LOANS |  |  |  |  |  |  |
Interest rate, basis spread (as a percent) |  |  | 1.60%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditRatingMoodysAxis = us-gaap_MoodysBaa3RatingMember / us-gaap_DebtInstrumentAxis = cube_CreditFacilityAmendedMember / us-gaap_LongtermDebtTypeAxis = cube_UnsecuredRevolvingCreditFacilityMaturityDecember2015Member |  |  |  |
Credit Facility, As Amended | Revolver | Baa2/BBB |  |  |  |  |  |  |
SECURED CREDIT FACILITY, UNSECURED CREDIT FACILITY AND SECURED TERM LOANS |  |  |  |  |  |  |
Interest rate, basis spread (as a percent) |  |  | 1.30%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditRatingMoodysAxis = us-gaap_MoodysBaa2RatingMember / us-gaap_DebtInstrumentAxis = cube_CreditFacilityAmendedMember / us-gaap_LongtermDebtTypeAxis = cube_UnsecuredRevolvingCreditFacilityMaturityDecember2015Member |  |  |  |
Credit Facility, As Amended | Term Loan C | Baa3/BBB |  |  |  |  |  |  |
SECURED CREDIT FACILITY, UNSECURED CREDIT FACILITY AND SECURED TERM LOANS |  |  |  |  |  |  |
Interest rate, basis spread (as a percent) |  |  | 1.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditRatingMoodysAxis = us-gaap_MoodysBaa3RatingMember / us-gaap_DebtInstrumentAxis = cube_CreditFacilityAmendedMember / us-gaap_LongtermDebtTypeAxis = cube_UnsecuredTermLoanMaturityDecember2014Member |  |  |  |
Credit Facility, As Amended | Term Loan C | Baa2/BBB |  |  |  |  |  |  |
SECURED CREDIT FACILITY, UNSECURED CREDIT FACILITY AND SECURED TERM LOANS |  |  |  |  |  |  |
Interest rate, basis spread (as a percent) |  |  | 1.30%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditRatingMoodysAxis = us-gaap_MoodysBaa2RatingMember / us-gaap_DebtInstrumentAxis = cube_CreditFacilityAmendedMember / us-gaap_LongtermDebtTypeAxis = cube_UnsecuredTermLoanMaturityDecember2014Member |  |  |  |
Credit Facility, As Amended | Term Loan D | Baa3/BBB |  |  |  |  |  |  |
SECURED CREDIT FACILITY, UNSECURED CREDIT FACILITY AND SECURED TERM LOANS |  |  |  |  |  |  |
Interest rate, basis spread (as a percent) |  |  | 1.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditRatingMoodysAxis = us-gaap_MoodysBaa3RatingMember / us-gaap_DebtInstrumentAxis = cube_CreditFacilityAmendedMember / us-gaap_LongtermDebtTypeAxis = cube_UnsecuredTermLoanMaturityMarch2017Member |  |  |  |
Credit Facility, As Amended | Term Loan D | Baa2/BBB |  |  |  |  |  |  |
SECURED CREDIT FACILITY, UNSECURED CREDIT FACILITY AND SECURED TERM LOANS |  |  |  |  |  |  |
Interest rate, basis spread (as a percent) |  |  | 1.30%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditRatingMoodysAxis = us-gaap_MoodysBaa2RatingMember / us-gaap_DebtInstrumentAxis = cube_CreditFacilityAmendedMember / us-gaap_LongtermDebtTypeAxis = cube_UnsecuredTermLoanMaturityMarch2017Member |  |  |  |
Credit Facility |  |  |  |  |  |  |
SECURED CREDIT FACILITY, UNSECURED CREDIT FACILITY AND SECURED TERM LOANS |  |  |  |  |  |  |
Remaining borrowing capacity | 261,200,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_DebtInstrumentAxis = cube_CreditFacilityMember |  |  |  |  |  |
Effective weighted average interest rate (as a percent) |  |  |  |  | 2.95%us-gaap_DebtWeightedAverageInterestRate / us-gaap_DebtInstrumentAxis = cube_CreditFacilityMember |  |
Net proceeds from equity issuances added to minimum tangible net worth (as a percent) | 75.00%cube_DebtInstrumentCovenantPercentageOfProceedsFromEquityIssuancesAddedToTangibleNetWorth / us-gaap_DebtInstrumentAxis = cube_CreditFacilityMember |  |  |  |  |  |
Credit Facility | Minimum |  |  |  |  |  |  |
SECURED CREDIT FACILITY, UNSECURED CREDIT FACILITY AND SECURED TERM LOANS |  |  |  |  |  |  |
Fixed charge coverage ratio | 1.5cube_DebtInstrumentCovenantFixedChargeCoverageRatio / us-gaap_DebtInstrumentAxis = cube_CreditFacilityMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |  |  |
Tangible net worth | 821,211,200cube_DebtInstrumentCovenantTangibleNetWorth / us-gaap_DebtInstrumentAxis = cube_CreditFacilityMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |  |  |
Credit Facility | Maximum |  |  |  |  |  |  |
SECURED CREDIT FACILITY, UNSECURED CREDIT FACILITY AND SECURED TERM LOANS |  |  |  |  |  |  |
Total indebtedness to total asset value ratio (as a percent) | 60.00%cube_DebtInstrumentCovenantTotalIndebtednessToTotalAssetValueRatio / us-gaap_DebtInstrumentAxis = cube_CreditFacilityMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |  |  |
Percentage of funds from operations that can be distributed on common shares | 95.00%cube_DebtInstrumentDistributionOnCommonSharesAsPercentageOfFundsFromOperationsCovenantCompliance / us-gaap_DebtInstrumentAxis = cube_CreditFacilityMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |  |  |
Credit Facility | Revolver |  |  |  |  |  |  |
SECURED CREDIT FACILITY, UNSECURED CREDIT FACILITY AND SECURED TERM LOANS |  |  |  |  |  |  |
Maximum borrowing capacity |  | 300,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = cube_CreditFacilityMember / us-gaap_LongtermDebtTypeAxis = cube_UnsecuredRevolvingCreditFacilityMaturityDecember2015Member |  |  |  |  | 300,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = cube_CreditFacilityMember / us-gaap_LongtermDebtTypeAxis = cube_UnsecuredRevolvingCreditFacilityMaturityDecember2015Member
Outstanding letter of credit | 30,000,000us-gaap_LettersOfCreditOutstandingAmount / us-gaap_DebtInstrumentAxis = cube_CreditFacilityMember / us-gaap_LongtermDebtTypeAxis = cube_UnsecuredRevolvingCreditFacilityMaturityDecember2015Member |  |  |  |  |  |
Credit Facility | Revolver | Baa3/BBB |  |  |  |  |  |  |
SECURED CREDIT FACILITY, UNSECURED CREDIT FACILITY AND SECURED TERM LOANS |  |  |  |  |  |  |
Interest rate, basis spread (as a percent) |  |  |  |  | 1.30%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditRatingMoodysAxis = us-gaap_MoodysBaa3RatingMember / us-gaap_DebtInstrumentAxis = cube_CreditFacilityMember / us-gaap_LongtermDebtTypeAxis = cube_UnsecuredRevolvingCreditFacilityMaturityDecember2015Member |  |
Variable interest rate basis |  |  |  |  | LIBOR |  |
Variable interest rate floor (as a percent) |  |  |  |  | 0.00%cube_DebtInstrumentVariableRateBasisFloor / us-gaap_CreditRatingMoodysAxis = us-gaap_MoodysBaa3RatingMember / us-gaap_DebtInstrumentAxis = cube_CreditFacilityMember / us-gaap_LongtermDebtTypeAxis = cube_UnsecuredRevolvingCreditFacilityMaturityDecember2015Member |  |
Facility fee (as a percent) |  |  |  |  | 0.20%us-gaap_LineOfCreditFacilityCommitmentFeePercentage / us-gaap_CreditRatingMoodysAxis = us-gaap_MoodysBaa3RatingMember / us-gaap_DebtInstrumentAxis = cube_CreditFacilityMember / us-gaap_LongtermDebtTypeAxis = cube_UnsecuredRevolvingCreditFacilityMaturityDecember2015Member |  |
Credit Facility | Term Loan C |  |  |  |  |  |  |
SECURED CREDIT FACILITY, UNSECURED CREDIT FACILITY AND SECURED TERM LOANS |  |  |  |  |  |  |
Maximum borrowing capacity |  | 100,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = cube_CreditFacilityMember / us-gaap_LongtermDebtTypeAxis = cube_UnsecuredTermLoanMaturityDecember2014Member |  |  |  |  | 100,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = cube_CreditFacilityMember / us-gaap_LongtermDebtTypeAxis = cube_UnsecuredTermLoanMaturityDecember2014Member
Repayment of outstanding debt |  |  |  |  |  | 100,000,000us-gaap_ExtinguishmentOfDebtAmount / us-gaap_DebtInstrumentAxis = cube_CreditFacilityMember / us-gaap_LongtermDebtTypeAxis = cube_UnsecuredTermLoanMaturityDecember2014Member |
Credit Facility | Term Loan C | Baa3/BBB |  |  |  |  |  |  |
SECURED CREDIT FACILITY, UNSECURED CREDIT FACILITY AND SECURED TERM LOANS |  |  |  |  |  |  |
Interest rate, basis spread (as a percent) |  |  |  |  | 1.30%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditRatingMoodysAxis = us-gaap_MoodysBaa3RatingMember / us-gaap_DebtInstrumentAxis = cube_CreditFacilityMember / us-gaap_LongtermDebtTypeAxis = cube_UnsecuredTermLoanMaturityDecember2014Member |  |
Variable interest rate basis |  |  |  |  | LIBOR |  |
Variable interest rate floor (as a percent) |  |  |  |  | 0.00%cube_DebtInstrumentVariableRateBasisFloor / us-gaap_CreditRatingMoodysAxis = us-gaap_MoodysBaa3RatingMember / us-gaap_DebtInstrumentAxis = cube_CreditFacilityMember / us-gaap_LongtermDebtTypeAxis = cube_UnsecuredTermLoanMaturityDecember2014Member |  |
Credit Facility | Term Loan D |  |  |  |  |  |  |
SECURED CREDIT FACILITY, UNSECURED CREDIT FACILITY AND SECURED TERM LOANS |  |  |  |  |  |  |
Maximum borrowing capacity |  | 200,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = cube_CreditFacilityMember / us-gaap_LongtermDebtTypeAxis = cube_UnsecuredTermLoanMaturityMarch2017Member |  |  |  |  | 200,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = cube_CreditFacilityMember / us-gaap_LongtermDebtTypeAxis = cube_UnsecuredTermLoanMaturityMarch2017Member
Credit Facility | Term Loan D | Baa3/BBB |  |  |  |  |  |  |
SECURED CREDIT FACILITY, UNSECURED CREDIT FACILITY AND SECURED TERM LOANS |  |  |  |  |  |  |
Interest rate, basis spread (as a percent) |  |  |  |  | 1.30%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditRatingMoodysAxis = us-gaap_MoodysBaa3RatingMember / us-gaap_DebtInstrumentAxis = cube_CreditFacilityMember / us-gaap_LongtermDebtTypeAxis = cube_UnsecuredTermLoanMaturityMarch2017Member |  |
Variable interest rate basis |  |  |  |  | LIBOR |  |
Variable interest rate floor (as a percent) |  |  |  |  | 0.00%cube_DebtInstrumentVariableRateBasisFloor / us-gaap_CreditRatingMoodysAxis = us-gaap_MoodysBaa3RatingMember / us-gaap_DebtInstrumentAxis = cube_CreditFacilityMember / us-gaap_LongtermDebtTypeAxis = cube_UnsecuredTermLoanMaturityMarch2017Member |  |
Credit Facility | Unsecured term loan |  |  |  |  |  |  |
SECURED CREDIT FACILITY, UNSECURED CREDIT FACILITY AND SECURED TERM LOANS |  |  |  |  |  |  |
Unsecured term loan borrowings outstanding | 200,000,000us-gaap_UnsecuredDebt / us-gaap_DebtInstrumentAxis = cube_CreditFacilityMember / us-gaap_LongtermDebtTypeAxis = cube_UnsecuredTermLoanMember |  |  |  |  |  |
Credit Facility | Unsecured revolving credit facility |  |  |  |  |  |  |
SECURED CREDIT FACILITY, UNSECURED CREDIT FACILITY AND SECURED TERM LOANS |  |  |  |  |  |  |
Unsecured term loan borrowings outstanding |  |  |  |  | 78,000,000us-gaap_UnsecuredDebt / us-gaap_DebtInstrumentAxis = cube_CreditFacilityMember / us-gaap_LongtermDebtTypeAxis = cube_UnsecuredRevolvingCreditFacilityMember |  |
Remaining borrowing capacity |  |  |  |  | 222,000,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_DebtInstrumentAxis = cube_CreditFacilityMember / us-gaap_LongtermDebtTypeAxis = cube_UnsecuredRevolvingCreditFacilityMember |  |

X
- Definition Represents the fixed charge coverage ratio required by the financial covenant under the terms of the debt agreement. + References No definition available. + Details
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- Definition Represents the percentage of net proceeds from equity issuances added to the minimum tangible net worth in calculating the financial covenant per the terms of the debt agreement. + References No definition available. + Details
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- Definition Represents the minimum tangible net worth required by the financial covenant under the terms of the debt agreement. + References No definition available. + Details
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- Definition Represents the total indebtedness to total asset value coverage ratio required by the financial covenant under the terms of the debt agreement. + References No definition available. + Details
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- Definition Represents the percentage of funds from operations that can be distributed on common shares as a condition under the covenant. + References No definition available. + Details
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Namespace Prefix: | cube_
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- Definition Represents the floor for the variable rate base of the debt instrument. + References No definition available. + Details
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Namespace Prefix: | cube_
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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
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- Details
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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
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- Definition Weighted average interest rate of debt outstanding. + References No definition available. + Details
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- Definition For an unclassified balance sheet, the amount as of the balance sheet date of capitalized costs associated with the issuance of debt instruments (for example, legal, accounting, underwriting, printing, and registration costs) that will be charged against earnings over the life of the debt instruments to which such costs pertain. Such amount is before the consideration of accumulated amortization. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28555-108399 + Details
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X
- Definition The reference rate for the variable rate of the interest rate derivative, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
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- Definition Gross amount of debt extinguished. + References No definition available. + Details
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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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- Definition The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used. + References No definition available. + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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X
- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of uncollateralized debt obligations (with maturities initially due after one year or beyond the operating cycle if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Article 5 -Subsection 19, 20, 22 + Details
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- Definition Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Details
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- Details
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- Details
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- Details
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- Details
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- Details
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- Details
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- Details
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