Quarterly report pursuant to Section 13 or 15(d)

INVESTMENT IN UNCONSOLIDATED REAL ESTATE VENTURE - Narrative (Details)

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INVESTMENT IN UNCONSOLIDATED REAL ESTATE VENTURE - Narrative (Details)
storage_unit in Thousands, ft² in Millions
Mar. 31, 2017
ft²
storage_unit
state
property
Schedule of Equity Method Investments [Line Items]  
Number of self storage properties | property 386
Total rentable square feet in self storage properties | ft² 23.3
Number of storage units owned | storage_unit 186
Number of states that self storage properties are owned in | state 20
IStorage Facilities [Member] | Joint Venture [Member]  
Schedule of Equity Method Investments [Line Items]  
Number of self storage properties | property 66
Total rentable square feet in self storage properties | ft² 4.5
Number of storage units owned | storage_unit 36
Number of states that self storage properties are owned in | state 12