ORGANIZATION AND NATURE OF OPERATIONS (Details)	9 Months Ended
Sep. 30, 2016 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	98.80%
Common stock, conversion ratio	1

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.

No definition available.

Name:	us-gaap_NumberOfReportableSegments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration