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SCHEDULE III REAL ESTATE AND RELATED DEPRECIATION (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Activity in Storage facilities
Balance at beginning of year	$ 2,553,706us-gaap_RealEstateGrossAtCarryingValue	$ 2,443,022us-gaap_RealEstateGrossAtCarryingValue
Acquisitions & improvements	576,845cube_RealEstateAcquisitionsAndImprovements	219,751cube_RealEstateAcquisitionsAndImprovements
Fully depreciated assets	(6,855)cube_RealEstateFullyDepreciatedAssets	(14,398)cube_RealEstateFullyDepreciatedAssets
Dispositions and other	(13,716)cube_RealEstateCostOfRealEstateSoldAndOtherDeductions	(127,700)cube_RealEstateCostOfRealEstateSoldAndOtherDeductions
Construction in progress	7,218cube_RealEstateGrossConstructionInProgress	33,031cube_RealEstateGrossConstructionInProgress
Balance at end of year	3,117,198us-gaap_RealEstateGrossAtCarryingValue	2,553,706us-gaap_RealEstateGrossAtCarryingValue
Activity in Accumulated depreciation
Balance at beginning of year	398,536us-gaap_RealEstateAccumulatedDepreciation	353,315us-gaap_RealEstateAccumulatedDepreciation
Depreciation expense	101,542us-gaap_SECScheduleIIIRealEstateAccumulatedDepreciationDepreciationExpense	87,708us-gaap_SECScheduleIIIRealEstateAccumulatedDepreciationDepreciationExpense
Fully depreciated assets	(6,855)cube_RealEstateAccumulatedDepreciationFullyDepreciatedAssets	(14,398)cube_RealEstateAccumulatedDepreciationFullyDepreciatedAssets
Dispositions and other	(1,154)cube_RealEstateAccumulatedDepreciationRealEstateSoldAndOtherDeductions	(28,089)cube_RealEstateAccumulatedDepreciationRealEstateSoldAndOtherDeductions
Balance at end of year	492,069us-gaap_RealEstateAccumulatedDepreciation	398,536us-gaap_RealEstateAccumulatedDepreciation
Real Estate Investment Property, Net	$ 2,625,129us-gaap_RealEstateInvestmentPropertyNet	$ 2,155,170us-gaap_RealEstateInvestmentPropertyNet

X

- Definition

Represents the amount of fully depreciated assets for the period.

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	duration

X

- Definition

Represents the amount that was removed from accumulated depreciation pertaining to real estate that was sold during the period. Also includes other decreases or increases in accumulated depreciation for the period.

+ References

No definition available.

+ Details

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Namespace Prefix:	cube_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- Definition

Represents the amount of real estate investments acquired and improvements made during the period.

+ References

No definition available.

+ Details

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Namespace Prefix:	cube_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- Definition

Represents the carrying amount of real estate sold during the period. Also includes other decrease (increase) in the carrying amount of real estate investments during the period.

+ References

No definition available.

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X

- Definition

Represents the amount of fully depreciated assets of real estate for the period.

+ References

No definition available.

+ Details

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Namespace Prefix:	cube_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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X

- Definition

Represents the gross amount of construction in progress of real estate during the period.

+ References

No definition available.

+ Details

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Namespace Prefix:	cube_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- Definition

Amount of accumulated depreciation pertaining to real estate investments for entities with a substantial portion of business acquiring and holding investment real estate.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 970

-SubTopic 360

-Section S99

-Paragraph 1

-Subparagraph (SX 210.12-28.FN4)

-URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 10

-Section S99

-Paragraph 6

-Subparagraph (SX 210.5-04.(c) Schedule III)

-URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 28

-Article 12



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph c

-Subparagraph Schedule III

-Article 5

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- Definition

Amount, before accumulated depreciation, of real estate investments for entities with a substantial portion of business acquiring and holding investment real estate.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 10

-Section S99

-Paragraph 6

-Subparagraph (SX 210.5-04.(c) Schedule III)

-URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 28

-Article 12



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph c

-Subparagraph Schedule III

-Article 5



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 970

-SubTopic 360

-Section S99

-Paragraph 1

-Subparagraph (SX 210.12-28.4)

-URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024

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- Definition

Amount of real estate investment property, net of accumulated depreciation, which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments.

+ 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 210.7-03.1(d))

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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X

- Definition

Amount of depreciation expense of real estate investments for entities with a substantial portion of business acquiring and holding investment real estate.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 970

-SubTopic 360

-Section S99

-Paragraph 1

-Subparagraph (SX 210.12-28.FN4)

-URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 10

-Section S99

-Paragraph 6

-Subparagraph (SX 210.5-04.(c) Schedule III)

-URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 28

-Article 12



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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-Paragraph c

-Subparagraph Schedule III

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