ORGANIZATION AND NATURE OF OPERATIONS (Details)	9 Months Ended
Sep. 30, 2012 ratio segment state
ORGANIZATION AND NATURE OF OPERATIONS
Number of states in which self-storage facilities are located	22
Number of reportable segments	1
Percentage of the entity's partnership interest in Operating Partnership	96.70%
Common stock, conversion ratio	1

The shares of common stock into which another convertible security can be converted, or shares of common stock into which another class of common stock can be converted.

No definition available.

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Namespace Prefix:	cube_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration