CONSOLIDATED STATEMENTS OF CAPITAL (LP cube) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Increase (Decrease) in Partners' Capital
Balance of Noncontrolling Interests in the Operating Partnership	$ 36,275
Contributions from noncontrolling interests in subsidiaries	642	831
Acquisition of noncontrolling interest			(56,984)
Adjustment for Operating Partnership interests of third parties	(14,761)	(3,292)	(19,520)
Net income (loss)	20,371	35,440	(4,191)
Net income (loss), including temporary equity	26,395	41,406	3,735
Other comprehensive income (loss):
Unrealized gains (losses) on interest rate swaps	2,427	8,751	(7,124)
Unrealized (loss) gain on foreign currency translation	(169)	55	168
Balance of Noncontrolling Interests in the Operating Partnership	49,823	36,275
Operating Partnership Interests of third parties
Increase (Decrease) in Partners' Capital
Balance of Noncontrolling Interests in the Operating Partnership	36,275	47,990	49,732
Acquisition of noncontrolling interest			(132)
Adjustment for Operating Partnership interests of third parties	14,761	3,292	19,520
Net income (loss)	307	588	(107)
Other comprehensive income (loss):
Unrealized gains (losses) on interest rate swaps	37	151	(342)
Unrealized (loss) gain on foreign currency translation	(6)	1	4
Balance of Noncontrolling Interests in the Operating Partnership	49,823	36,275	47,990
CubeSmart, L.P. and Subsidiaries
Increase (Decrease) in Partners' Capital
Balance	1,093,207	989,909	995,322
Balance of Noncontrolling Interests in the Operating Partnership	36,275
Contributions from noncontrolling interests in subsidiaries	642	831
Issuance of common OP units, net	416,001	100,287	102,079
Issuance of restricted OP units	5	3	2
Conversion from OP units to shares	308	14,698	19,247
Exercise of OP unit options	13,802	3,710	1,629
Amortization of restricted OP units	182	4,747	3,352
OP unit compensation expense	1,553	870	1,198
Acquisition of noncontrolling interest			(56,984)
Adjustment for Operating Partnership interests of third parties	(14,761)	(3,292)	(19,520)
Net income (loss)	20,371	35,440	(4,191)
Net income (loss), including temporary equity	26,395	41,406	3,735
Other comprehensive income (loss):
Unrealized gains (losses) on interest rate swaps	2,427	8,751	(7,124)
Unrealized (loss) gain on foreign currency translation	(169)	55	168
Preferred OP unit distributions	(6,008)	(6,008)	(6,008)
Common OP unit distributions	(83,966)	(62,760)	(47,187)
Balance	1,449,618	1,093,207	989,909
Balance of Noncontrolling Interests in the Operating Partnership	49,823	36,275
CubeSmart, L.P. and Subsidiaries \| Operating Partnership Interests of third parties
Increase (Decrease) in Partners' Capital
Balance of Noncontrolling Interests in the Operating Partnership	36,275	47,990	49,732
Conversion from OP units to shares	(308)	(14,698)	(19,247)
Acquisition of noncontrolling interest			(132)
Adjustment for Operating Partnership interests of third parties	14,761	3,292	19,520
Net income (loss)	307	588	(107)
Other comprehensive income (loss):
Unrealized gains (losses) on interest rate swaps	37	151	(342)
Unrealized (loss) gain on foreign currency translation	(6)	1	4
Common OP unit distributions	(1,243)	(1,049)	(1,438)
Balance of Noncontrolling Interests in the Operating Partnership	49,823	36,275	47,990
CubeSmart, L.P. and Subsidiaries \| Total Shareholders' Equity
Increase (Decrease) in Partners' Capital
Balance	1,092,276	989,791	955,913
Issuance of common OP units, net	416,001	100,287	102,079
Issuance of restricted OP units	5	3	2
Conversion from OP units to shares	308	14,698	19,247
Exercise of OP unit options	13,802	3,710	1,629
Amortization of restricted OP units	182	4,747	3,352
OP unit compensation expense	1,553	870	1,198
Acquisition of noncontrolling interest			(18,452)
Adjustment for Operating Partnership interests of third parties	(14,761)	(3,292)	(19,520)
Net income (loss)	26,379	41,448	1,817
Other comprehensive income (loss):
Unrealized gains (losses) on interest rate swaps	2,427	8,751	(7,124)
Unrealized (loss) gain on foreign currency translation	(172)	31	159
Preferred OP unit distributions	(6,008)	(6,008)	(6,008)
Common OP unit distributions	(83,966)	(62,760)	(44,501)
Balance	1,448,026	1,092,276	989,791
CubeSmart, L.P. and Subsidiaries \| Operating Partner
Increase (Decrease) in Partners' Capital
Balance	1,103,290	1,009,587	968,744
Balance (in units)	139,328	131,795	122,059
Issuance of common OP units, net	416,001	100,287	102,079
Issuance of common OP units (in units)	22,704	5,700	7,900
Issuance of restricted OP units	5	3	2
Issuance of restricted OP units (in units)	482	301	246
Conversion from OP units to shares	308	14,698	19,247
Conversion from OP units to shares (in units)	18	1,018	1,380
Exercise of OP unit options	13,802	3,710	1,629
Exercise of OP unit options (in units)	1,425	514	210
Amortization of restricted OP units	182	4,747	3,352
OP unit compensation expense	1,553	870	1,198
Acquisition of noncontrolling interest			(18,452)
Adjustment for Operating Partnership interests of third parties	(14,761)	(3,292)	(19,520)
Net income (loss)	26,379	41,448	1,817
Other comprehensive income (loss):
Preferred OP unit distributions	(6,008)	(6,008)	(6,008)
Common OP unit distributions	(83,966)	(62,760)	(44,501)
Balance	1,456,785	1,103,290	1,009,587
Balance (in units)	163,957	139,328	131,795
CubeSmart, L.P. and Subsidiaries \| Preferred Operating Partner
Increase (Decrease) in Partners' Capital
Balance (in units)				3,100
Other comprehensive income (loss):
Balance (in units)	3,100	3,100	3,100	3,100
CubeSmart, L.P. and Subsidiaries \| Accumulated Other Comprehensive (Loss)
Increase (Decrease) in Partners' Capital
Balance	(11,014)	(19,796)	(12,831)
Other comprehensive income (loss):
Unrealized gains (losses) on interest rate swaps	2,427	8,751	(7,124)
Unrealized (loss) gain on foreign currency translation	(172)	31	159
Balance	(8,759)	(11,014)	(19,796)
CubeSmart, L.P. and Subsidiaries \| Noncontrolling Interest in Subsidiaries
Increase (Decrease) in Partners' Capital
Balance	931	118	39,409
Contributions from noncontrolling interests in subsidiaries	642	831
Acquisition of noncontrolling interest			(38,532)
Net income (loss)	16	(42)	1,918
Other comprehensive income (loss):
Unrealized (loss) gain on foreign currency translation	3	24	9
Common OP unit distributions			(2,686)
Balance	$ 1,592	$ 931	$ 118

Represents the amount of amortization of restricted operating units during the period.

No definition available.

Name:	cube_PartnersCapitalAccountAmortizationOfRestrictedUnits
Namespace Prefix:	cube_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Represents aggregate number of operating units related to options exercised during the year.

+ References

No definition available.

+ Details

Name:	cube_PartnersCapitalAccountOptionUnitExercise
Namespace Prefix:	cube_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents aggregate number of operating units related to operating unit issued units during the period.

+ References

No definition available.

+ Details

Name:	cube_PartnersCapitalAccountRestrictedUnitsUnitIssued
Namespace Prefix:	cube_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents aggregate value of operating units related to restricted operating units issued during the period.

+ References

No definition available.

+ Details

Name:	cube_PartnersCapitalAccountRestrictedUnitsValueIssued
Namespace Prefix:	cube_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Represents the total distributions made to preferred partners.

+ References

No definition available.

+ Details

Name:	cube_PreferredPartnersCapitalAccountDistributions
Namespace Prefix:	cube_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The amount of profit or loss for the period, net of income taxes, including the amount of net income (loss) for the period allocated to noncontrolling partners in an operating partnership included in the entity's consolidated financial statements.

+ References

No definition available.

+ Details

Name:	cube_ProfitLossIncludingTemporaryEquityNetIncomeLoss
Namespace Prefix:	cube_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	us-gaap_IncreaseDecreaseInPartnersCapitalRollForward
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Change in noncontrolling interest during the period as a result of a change in the redemption value of redeemable noncontrolling interest.

+ References

No definition available.

+ Details

Name:	us-gaap_MinorityInterestChangeInRedemptionValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Decrease in noncontrolling interest (for example, but not limited to, redeeming or purchasing the interests of noncontrolling shareholders, issuance of shares (interests) by the non-wholly owned subsidiary to the parent entity for other than cash, and a buyback of shares (interest) by the non-wholly owned subsidiary from the noncontrolling interests).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 45

-Paragraph 23

-URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4569655-111683

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 45

-Paragraph 24

-URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4616395-111683

+ Details

Name:	us-gaap_MinorityInterestDecreaseFromRedemptions
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 45

-Paragraph 11

-URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1377-109256

+ Details

Name:	us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of increase in noncontrolling interest from subsidiary issuance of equity interests to noncontrolling interest holders.

+ References

No definition available.

+ Details

Name:	us-gaap_NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount after tax and reclassification adjustments, of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

+ References

+ Details

Name:	us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 45

-Paragraph 10A

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=28358780&loc=SL7669646-108580

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 830

-SubTopic 30

-Section 45

-Paragraph 20

-Subparagraph (b,c)

-URI http://asc.fasb.org/extlink&oid=6915805&loc=d3e32211-110900

+ Details

Name:	us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Total contributions made by each class of partners (i.e., general, limited and preferred partners).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 5

-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187171-122770

+ Details

Name:	us-gaap_PartnersCapitalAccountContributions
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Total distributions to each class of partners (i.e., general, limited and preferred partners).

+ References

+ Details

Name:	us-gaap_PartnersCapitalAccountDistributions
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Total change in each class of partners' capital accounts during the year due to exchanges and conversions. Partners include general, limited and preferred partners.

+ References

+ Details

Name:	us-gaap_PartnersCapitalAccountExchangesAndConversions
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Total change in each class of partners' capital accounts during the year due to option exercise. All partners include general, limited and preferred partners.

+ References

+ Details

Name:	us-gaap_PartnersCapitalAccountOptionExercise
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Total change in each class of partners' capital accounts during the year due to unit-based compensation. All partners include general, limited and preferred partners.

+ References

+ Details

Name:	us-gaap_PartnersCapitalAccountUnitBasedCompensation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The number of each class of partnership units outstanding at the balance sheet date. Units represent shares of ownership of the general, limited, and preferred partners.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 946

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.6-04.16(a))

-URI http://asc.fasb.org/extlink&oid=6488278&loc=d3e603758-122996

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 5

-Subparagraph (SAB TOPIC 4.F)

-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187171-122770

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 16

-Subparagraph a, b

-Article 6

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 946

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.6-04.16(b))

-URI http://asc.fasb.org/extlink&oid=6488278&loc=d3e603758-122996

+ Details

Name:	us-gaap_PartnersCapitalAccountUnits
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Units contributed by each class of partners during the year. Units represent shares of ownership of the general, limited, and preferred partners.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 5

-Subparagraph (SAB TOPIC 4.F)

-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187171-122770

+ Details

Name:	us-gaap_PartnersCapitalAccountUnitsContributed
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of units converted into shares of each class of partners' capital account. Units represent shares of ownership of the general, limited, and preferred partners.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 5

-Subparagraph (SAB TOPIC 4.F)

-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187171-122770

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 16

-Subparagraph a, b

-Article 6

+ Details

Name:	us-gaap_PartnersCapitalAccountUnitsConverted
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of partners' capital (deficit), including portions attributable to both the parent and noncontrolling interests. Excludes temporary equity and is sometimes called permanent equity.

+ References

+ Details

Name:	us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Carrying amount, attributable to noncontrolling interests, of an entity's issued and outstanding stock which is not included within permanent equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. Includes stock with a put option held by an ESOP and stock redeemable by a holder only in the event of a change in control of the issuer.

+ References

No definition available.

+ Details

Name:	us-gaap_TemporaryEquityCarryingAmountAttributableToNoncontrollingInterest
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	cube_TemporaryEquityAxis=cube_TemporaryEquityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=us-gaap_SubsidiariesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: