SUBSEQUENT EVENTS (Details) (USD $)	0 Months Ended				9 Months Ended
	Aug. 25, 2014 HSRE Acquisition property	Nov. 03, 2014 Subsequent event HSRE Acquisition item	Oct. 20, 2014 Subsequent event Parent	Oct. 02, 2014 Subsequent event Equity Distribution Agreements	Sep. 30, 2014 Subsequent event Texas property
Subsequent Events
Number of self-storage facilities acquired (in properties)	26				3
Aggregate purchase price	$ 223,000,000				$ 23,900,000
Number of shares that may be sold through "at-the-market" equity program before amendment				20,000,000
Number of shares that may be sold through "at-the-market" equity program				30,000,000
Initial public offering, aggregate number of shares of common stock sold			7,475,000
Public offering price (in dollars per share)			$ 19.33
Number of shares of common stock purchased by underwriters to cover overallotment			975,000
Net proceeds from the offering			143,000,000
Number of facilities closed		22
Aggregate purchase price of facilities closed		$ 195,500,000
Number of facilities not yet closed		4