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ORGANIZATION AND NATURE OF OPERATIONS (Details)	3 Months Ended
	Mar. 31, 2013 segment state
ORGANIZATION AND NATURE OF OPERATIONS
Number of states in which self-storage facilities are located	21
Number of reportable segments	1
Percentage of the entity's partnership interest in Operating Partnership	98.30%
Common stock, conversion ratio	1.00

X

- Definition

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.

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- Definition

The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

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X

- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

+ References

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X

- Definition

The number of states the entity operates in as of the balance sheet date.

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