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ORGANIZATION AND NATURE OF OPERATIONS (Details)		12 Months Ended
	May 09, 2017 shares	Dec. 31, 2017 state segment
ORGANIZATION AND NATURE OF OPERATIONS
Number of states in which self-storage facilities are located | state		23
Number of reportable segments | segment		1
Percentage of the entity's partnership interest in Operating Partnership		99.00%
Issuance of OP Units (in shares) | shares	440,160
Common stock, conversion ratio		1

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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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Operating units issued during the year.

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

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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.

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

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