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INVESTMENT ACTIVITY (Details)
 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 18, 2015
USD ($)
facility
Nov. 03, 2014
USD ($)
facility
Jun. 30, 2015
USD ($)
Mar. 31, 2015
Jun. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
facility
property
Jun. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
facility
property
Dec. 31, 2008
Mar. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Self-storage facilities                      
Development costs     $ 71,800,000     $ 71,800,000          
Storage facilities     3,260,426,000     3,260,426,000   $ 3,117,198,000      
Number of facilities under contract           5          
Gain from sale of real estate         $ 475,000   $ 475,000        
Summary of the amounts of revenue and earnings of the 2014 and 2013 acquisitions since the acquisition dates                      
Total revenue     1,524,000   3,843,000 1,743,000 5,200,000        
Net loss     (1,146,000)   $ (2,115,000) $ (1,124,000) $ (2,914,000)        
USIFB, LLP                      
Self-storage facilities                      
Ownership interest held by the entity (as a percent)                 97.00%    
5 Old Lancaster Road located in Malvern, PA                      
Self-storage facilities                      
Storage facilities                     $ 25,100,000
Bronx, NY                      
Self-storage facilities                      
Development costs                   $ 17,200,000  
Self-storage facilities located in Newyork                      
Self-storage facilities                      
Number of self-storage facilities | facility           4          
Self-storage Facility in Washington D C [Member]                      
Self-storage facilities                      
Number of self-storage facilities | facility           1          
Self-storage Facility in Arlington, VA [Member]                      
Self-storage facilities                      
Storage facilities     $ 17,100,000     $ 17,100,000          
Ownership interest held by the entity (as a percent)     90.00%                
2015 Acquisitions                      
Self-storage facilities                      
Number of self-storage facilities acquired (in properties) | property           11          
Aggregate purchase or sale price     $ 92,965,000     $ 92,965,000          
2015 Acquisitions | HSRE                      
Self-storage facilities                      
Number of self-storage facilities | facility               26      
Number of self-storage facilities acquired (in properties) | facility 4             22      
Aggregate purchase or sale price               $ 223,000,000      
Intangible value of the in-place leases     2,700,000     $ 2,700,000          
Estimated life           12 months          
Amortization expense           $ 700,000          
Aggregate purchase price of facilities closed $ 27,500,000             $ 195,500,000      
2015 Acquisitions | Self-storage facilities located in US                      
Self-storage facilities                      
Number of self-storage facilities acquired (in properties) | facility           7          
Aggregate purchase or sale price     65,500,000     $ 65,500,000          
Intangible value of the in-place leases     3,800,000     $ 3,800,000          
Estimated life           12 months          
Amortization expense           $ 500,000          
Number of properties, assumed mortgage | facility           1          
Assumed mortgage debt, at fair value     2,700,000     $ 2,700,000          
Outstanding principal balance of mortgage debt assumed on acquisitions     2,500,000     2,500,000          
Premium on debt assumed on acquisitions     200,000     200,000          
2014 Acquisitions                      
Self-storage facilities                      
Number of self-storage facilities acquired (in properties) | property               53      
Aggregate purchase or sale price               $ 568,226,000      
2014 Acquisitions | Self-storage facilities located in US                      
Self-storage facilities                      
Number of self-storage facilities acquired (in properties) | facility               31      
Aggregate purchase or sale price               $ 372,700,000      
Intangible value of the in-place leases               $ 23,800,000      
Estimated life               12 months      
Amortization expense           8,100,000          
Number of properties, assumed mortgage | facility               4      
Assumed mortgage debt, at fair value               $ 27,500,000      
Outstanding principal balance of mortgage debt assumed on acquisitions               26,000,000      
Premium on debt assumed on acquisitions               $ 1,500,000      
2014 Acquisitions | Self-storage facilities located in US | HSRE                      
Self-storage facilities                      
Number of self-storage facilities acquired (in properties) | facility   22                  
Aggregate purchase or sale price   $ 195,500,000                  
Intangible value of the in-place leases   $ 14,500,000                  
Estimated life       12 months              
Amortization expense           7,200,000          
Real Estate Acquisition Expected by 2016                      
Self-storage facilities                      
Deposit     5,100,000     5,100,000          
Number of facilities under contract           4          
Expected aggregate purchase or sales price     90,200,000     90,200,000          
Note receivable     4,100,000     $ 4,100,000          
Self-storage facilities                      
Self-storage facilities                      
Number of self-storage facilities acquired (in properties) | property           11   53      
Aggregate purchase or sale price     $ 93,000,000     $ 93,000,000   $ 568,200,000