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SCHEDULE III REAL ESTATE AND RELATED DEPRECIATION (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Activity in Storage facilities
Balance at beginning of year	$ 3,998,180	$ 3,467,032
Acquisitions & improvements	247,546	490,980
Fully depreciated assets	(53,903)	(61,232)
Dispositions and other	(9,179)
Construction in progress	(20,929)	101,400
Balance at end of year	4,161,715	3,998,180
Activity in Accumulated depreciation
Balance at beginning of year	671,364	594,049
Depreciation expense	135,732	138,547
Fully depreciated assets	(53,903)	(61,232)
Dispositions and other	(268)
Balance at end of year	752,925	671,364
Real Estate Investment Property, Net	$ 3,408,790	$ 3,326,816

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- Definition

Represents the amount of fully depreciated assets for the period.

+ References

No definition available.

+ Details

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Balance Type:	debit
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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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- Definition

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

+ References

No definition available.

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- 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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- 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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- 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_
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Balance Type:	debit
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- 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

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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 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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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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No definition available.

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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- 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 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 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

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