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UNSECURED SENIOR NOTES (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2014 | Dec. 17, 2013 | Jun. 26, 2012
Senior notes 4.375% due December 15, 2023 |  |  |
Mortgage loans and Notes payable |  |  |
Senior notes, principal amount |  | $ 250us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = cube_SeniorNotes4.375PercentDueOnDecember152023Member |
Senior notes, interest rate (as a percent) |  | 4.375%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = cube_SeniorNotes4.375PercentDueOnDecember152023Member |
Senior notes 4.375% due December 15, 2023 | Maximum |  |  |
Mortgage loans and Notes payable |  |  |
Consolidated leverage ratio | 0.60cube_DebtInstrumentCovenantConsolidatedLeverageRatio / us-gaap_DebtInstrumentAxis = cube_SeniorNotes4.375PercentDueOnDecember152023Member / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Secured debt leverage ratio | 0.40cube_DebtInstrumentCovenantConsolidatedSecuredLeverageRatio / us-gaap_DebtInstrumentAxis = cube_SeniorNotes4.375PercentDueOnDecember152023Member / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Senior notes 4.375% due December 15, 2023 | Minimum |  |  |
Mortgage loans and Notes payable |  |  |
Consolidated interest coverage ratio | 1.50cube_DebtInstrumentCovenantConsolidatedInterestCoverageRatio / us-gaap_DebtInstrumentAxis = cube_SeniorNotes4.375PercentDueOnDecember152023Member / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Financial and customary covenant, minimum unencumbered asset (as a percent) | 150.00%cube_DebtInstrumentCovenantUnencumberedAssets / us-gaap_DebtInstrumentAxis = cube_SeniorNotes4.375PercentDueOnDecember152023Member / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Senior notes 4.80% due July 15, 2022 |  |  |
Mortgage loans and Notes payable |  |  |
Senior notes, principal amount |  |  | $ 250us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = cube_SeniorNotes4.80PercentDueOnJuly152022Member
Senior notes, interest rate (as a percent) |  |  | 4.80%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = cube_SeniorNotes4.80PercentDueOnJuly152022Member
Senior notes 4.80% due July 15, 2022 | Maximum |  |  |
Mortgage loans and Notes payable |  |  |
Consolidated leverage ratio | 0.60cube_DebtInstrumentCovenantConsolidatedLeverageRatio / us-gaap_DebtInstrumentAxis = cube_SeniorNotes4.80PercentDueOnJuly152022Member / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Secured debt leverage ratio | 0.40cube_DebtInstrumentCovenantConsolidatedSecuredLeverageRatio / us-gaap_DebtInstrumentAxis = cube_SeniorNotes4.80PercentDueOnJuly152022Member / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Senior notes 4.80% due July 15, 2022 | Minimum |  |  |
Mortgage loans and Notes payable |  |  |
Consolidated interest coverage ratio | 1.50cube_DebtInstrumentCovenantConsolidatedInterestCoverageRatio / us-gaap_DebtInstrumentAxis = cube_SeniorNotes4.80PercentDueOnJuly152022Member / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Financial and customary covenant, minimum unencumbered asset (as a percent) | 150.00%cube_DebtInstrumentCovenantUnencumberedAssets / us-gaap_DebtInstrumentAxis = cube_SeniorNotes4.80PercentDueOnJuly152022Member / us-gaap_RangeAxis = us-gaap_MinimumMember |  |

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- Definition The interest coverage ratio permitted under the terms of a senior credit facility covenant. + References No definition available. + Details
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- Definition The secured leverage ratio permitted under the terms of a senior credit facility covenant. + References No definition available. + Details
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- Definition The covenant percentage permitted under the terms of a senior credit facility of unencumbered assets to unsecured indebtedness. + References No definition available. + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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