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EARNINGS PER SHARE AND UNIT AND SHAREHOLDERS' EQUITY AND CAPITAL (Details 2) (USD $) | 12 Months Ended | 0 Months Ended
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Oct. 20, 2014
Issuance of Common and Preferred Shares |  |  |  |
Net proceeds from sale of common shares | $ 416,001,000us-gaap_StockIssuedDuringPeriodValueNewIssues | $ 100,287,000us-gaap_StockIssuedDuringPeriodValueNewIssues | $ 102,079,000us-gaap_StockIssuedDuringPeriodValueNewIssues |
Series A Preferred shares, shares outstanding | 3,100,000us-gaap_PreferredStockSharesOutstanding | 3,100,000us-gaap_PreferredStockSharesOutstanding |  |
Series A Preferred shares, percentage | 7.75%us-gaap_PreferredStockDividendRatePercentage | 7.75%us-gaap_PreferredStockDividendRatePercentage |  |
Liquidation preference | 77,500,000us-gaap_PreferredStockLiquidationPreferenceValue | 77,500,000us-gaap_PreferredStockLiquidationPreferenceValue |  |
Liquidation preference (per share) | $ 25.00us-gaap_PreferredStockLiquidationPreference | $ 25.00us-gaap_PreferredStockLiquidationPreference |  |
Common Shares |  |  |  |
Issuance of Common and Preferred Shares |  |  |  |
Number of common stock sold (in shares) |  |  |  | 7,475,000us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember
Average sales price per common share (in dollars per share) |  |  |  | $ 19.33cube_SaleOfCommonStockPricePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember
Number of shares of common stock purchased by underwriters to cover overallotment |  |  |  | 975,000cube_StockIssuedDuringPeriodSharesNewIssuesOverAllotment / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember
Net proceeds from sale of common shares |  |  |  | 143,000,000us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember
Common Shares | Equity Distribution Agreements |  |  |  |
Issuance of Common and Preferred Shares |  |  |  |
Number of common stock sold (in shares) | 15,200,000us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember / us-gaap_TypeOfArrangementAxis = cube_EquityDistributionAgreementsMember | 5,700,000us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember / us-gaap_TypeOfArrangementAxis = cube_EquityDistributionAgreementsMember |  |
Average sales price per common share (in dollars per share) | $ 18.22cube_SaleOfCommonStockPricePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember / us-gaap_TypeOfArrangementAxis = cube_EquityDistributionAgreementsMember | $ 17.92cube_SaleOfCommonStockPricePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember / us-gaap_TypeOfArrangementAxis = cube_EquityDistributionAgreementsMember |  |
Gross Proceeds from sale of common shares | $ 273,000,000cube_StockIssuedDuringPeriodValueNewIssuesGross / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember / us-gaap_TypeOfArrangementAxis = cube_EquityDistributionAgreementsMember | $ 100,300,000cube_StockIssuedDuringPeriodValueNewIssuesGross / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember / us-gaap_TypeOfArrangementAxis = cube_EquityDistributionAgreementsMember |  |
Common shares remained available for issuance | 9,200,000cube_StockRemainedAvailableForIssuance / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember / us-gaap_TypeOfArrangementAxis = cube_EquityDistributionAgreementsMember |  |  |
Common Shares | Equity Distribution Agreements | Maximum |  |  |  |
Issuance of Common and Preferred Shares |  |  |  |
Number of shares that may be sold | 30,000,000cube_NumberOfSharesThatCanBeSoldUnderSaleAgreement / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember / us-gaap_TypeOfArrangementAxis = cube_EquityDistributionAgreementsMember |  |  |

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- Definition The per share liquidation preference (or restrictions) of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21484-112644 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph d -Article 4 Reference 5: 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.(d)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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