Quarterly report pursuant to Section 13 or 15(d)

RELATED PARTY TRANSACTIONS (Details)

v3.4.0.3
RELATED PARTY TRANSACTIONS (Details)
3 Months Ended
Apr. 01, 2015
shares
Mar. 31, 2016
USD ($)
ft²
Mar. 31, 2015
USD ($)
Related Party Transaction [Line Items]      
General and administrative expenses   $ 4,335,000 $ 3,613,000
Property operating expenses   13,277,000 9,842,000
Supervisory and Administrative Fee Agreement [Member] | Participating Regional Operator [Member] | Management [Member]      
Related Party Transaction [Line Items]      
General and administrative expenses   $ 2,200,000 1,600,000
Supervisory and Administrative Fee Agreement [Member] | Participating Regional Operator [Member] | Minimum [Member] | Management [Member]      
Related Party Transaction [Line Items]      
Fee agreement on gross revenue, percent   5.00%  
Supervisory and Administrative Fee Agreement [Member] | Participating Regional Operator [Member] | Maximum [Member] | Management [Member]      
Related Party Transaction [Line Items]      
Fee agreement on gross revenue, percent   6.00%  
Payroll Services [Member] | Participating Regional Operator [Member] | Management [Member]      
Related Party Transaction [Line Items]      
Property operating expenses   $ 4,000,000 2,900,000
Call Center Services [Member] | SecuCare Self Storage Inc. [Member] | Affiliated Entity [Member]      
Related Party Transaction [Line Items]      
Property operating expenses     200,000
Area occupied by related party | ft²   1,500  
Annual rent   $ 25,000  
Call Center Services [Member] | SecuCare Self Storage Inc. [Member] | Affiliated Entity [Member] | Call Center [Member]      
Related Party Transaction [Line Items]      
Issuance of OP units and subordinated performance units for acquisition of call center | shares 50,000    
Acquisition Costs [Member] | Due Diligence Costs [Member] | Participating Regional Operator [Member] | Management [Member]      
Related Party Transaction [Line Items]      
Due diligence expenses payable to the PROs   $ 100,000 $ 0