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INVESTMENT ACTIVITY (Details)
$ / shares in Units, £ in Millions
 1 Months Ended 2 Months Ended 3 Months Ended 12 Months Ended
Jun. 02, 2017
USD ($)
Apr. 12, 2017
USD ($)
shares
Aug. 12, 2016
USD ($)
Apr. 18, 2016
USD ($)
shares
Apr. 06, 2016
USD ($)
Dec. 15, 2015
USD ($)
facility
Oct. 08, 2015
USD ($)
item
Oct. 02, 2015
GBP (£)
Oct. 02, 2015
USD ($)
May 14, 2015
USD ($)
shares
Mar. 18, 2015
USD ($)
facility
Nov. 03, 2014
USD ($)
facility
Aug. 25, 2014
USD ($)
facility
Jan. 31, 2016
item
Dec. 31, 2015
item
Jun. 30, 2014
USD ($)
facility
Jan. 31, 2016
item
Dec. 31, 2015
Dec. 31, 2017
USD ($)
property
item
facility
$ / shares
shares
Dec. 31, 2016
USD ($)
property
item
facility
Dec. 31, 2015
USD ($)
facility
Dec. 31, 2008
Self-storage facilities                                            
Proceeds from sales of facilities, net                                         $ 9,041,000  
Storage facilities                                     $ 4,161,715,000 $ 3,998,180,000    
Restricted cash                                     3,890,000 $ 7,893,000    
Gain from sale of real estate, net                                         $ 17,567,000  
OP units issued (in shares) | shares       61,224           20,408                        
Issuance of OP Shares       $ 1,500,000           $ 500,000                        
Acquisition of noncontrolling interest                                     9,033,000      
USIFB, LLP                                            
Self-storage facilities                                            
Aggregate sale price               £ 6.5 $ 9,900,000                          
Proceeds from sales of facilities, net                               $ 7,000,000            
Ownership interest held by the entity (as a percent)               97.00% 97.00%                       97.00% 97.00%
Number of assets sold | facility                               1            
Gain from sale of real estate, net                 $ 3,000,000                          
Foreign currency translation loss                 $ 1,200,000                          
Self storage in operation                                            
Self-storage facilities                                            
Number of facilities, construction completed and opened                                     9      
Total Construction Costs                                     281,300,000      
Self storage under construction                                            
Self-storage facilities                                            
Development costs                                     121,000,000      
Expected construction cost                                     $ 232,600,000      
Number of facilities under contract | facility                                     6      
Self-storage facilities located in New York                                            
Self-storage facilities                                            
Ownership interest held by the entity (as a percent)                                     90.00%      
Number of facilities, construction completed and opened                                     $ 1      
Total Construction Costs                                     $ 81,200,000      
Self-storage Facility in Arlington, VA                                            
Self-storage facilities                                            
Ownership interest held by the entity (as a percent)                                     90.00%      
Number of facilities, construction completed and opened                                     $ 1      
Total Construction Costs                                     $ 17,100,000      
Self-storage Facility in Washington DC                                            
Self-storage facilities                                            
Ownership interest held by the entity (as a percent)                                     100.00%      
Number of facilities, construction completed and opened                                     $ 1      
Total Construction Costs                                     $ 27,800,000      
Self-storage Facility In North Palm Beach, FL                                            
Self-storage facilities                                            
Ownership interest held by the entity (as a percent)                                     100.00%      
Number of facilities, construction completed and opened                                     $ 1      
Total Construction Costs                                     $ 9,700,000      
Self-storage Facility in Queens, NY                                            
Self-storage facilities                                            
Ownership interest held by the entity (as a percent)                                     100.00%      
Number of facilities, construction completed and opened                                     $ 1      
Total Construction Costs                                     $ 31,800,000      
Self Storage Facility in Queens, NY I                                            
Self-storage facilities                                            
Cash paid for acquisition         $ 12,500,000                                  
Ownership interest held by the entity (as a percent)                                     90.00%      
Number of facilities, construction completed and opened                                     $ 1      
Total Construction Costs                                     $ 17,400,000      
Acquisition of remaining interest in real estate ventures (as a percent)         49.00%                                  
Cash paid for acquisition of remaining interest in real estate ventures         $ 12,500,000                                  
Self-storage Facility in Brooklyn, NY                                            
Self-storage facilities                                            
Ownership interest held by the entity (as a percent)                                     51.00%      
Number of facilities, construction completed and opened                                     $ 1      
Total Construction Costs                                     $ 49,300,000      
Self Storage Facility in Brooklyn, NY I                                            
Self-storage facilities                                            
Cash paid for acquisition $ 9,000,000                                          
Ownership interest held by the entity (as a percent)                                   90.00% 100.00%      
Number of facilities, construction completed and opened                                     $ 1      
Total Construction Costs                                     $ 14,800,000      
Minority ownership interest (as a percent) 0.00%                                          
Acquisition of remaining interest in real estate ventures (as a percent) 10.00%                                          
Cash paid for acquisition of remaining interest in real estate ventures $ 9,000,000                                          
Acquisition of noncontrolling interest 8,600,000                                          
Repayments of debt $ 9,800,000                                          
Self-storage Facility in Bronx, NY                                            
Self-storage facilities                                            
Cash paid for acquisition     $ 17,000,000                                      
Ownership interest held by the entity (as a percent)                                     100.00%      
Number of facilities, construction completed and opened                                     $ 1      
Total Construction Costs                                     $ 32,200,000      
Acquisition of remaining interest in real estate ventures (as a percent)     49.00%                                      
Cash paid for acquisition of remaining interest in real estate ventures     $ 17,000,000                                      
Self Storage Facilities in Bronx, NY and Brooklyn, NY                                            
Self-storage facilities                                            
Ownership interest held by the entity (as a percent)                                       51.00%    
Number of joint ventures | item                                       2    
2017 Acquisitions                                            
Self-storage facilities                                            
Number of self-storage facilities acquired | facility                                     7      
Aggregate purchase price                                     $ 80,650,000      
Summary of the amounts of revenue and earnings of the 2016 and 2015 acquisitions since the acquisition dates                                            
Total revenue                                     1,572,000      
Net loss                                     (1,330,000)      
2017 Acquisitions | Self storage under construction                                            
Self-storage facilities                                            
Aggregate purchase price                                     33,000,000      
Contract amount to purchase real estate                                     $ 1,000,000      
Number of facilities under contract | item                                     2      
2017 Acquisitions | Self-storage facilities located in US                                            
Self-storage facilities                                            
Number of self-storage facilities acquired | facility                                     6      
Number of self-storage facilities acquired upon completion of construction | facility                                     2      
Aggregate purchase price                                     $ 69,500,000      
Intangible value of the in-place leases                                     $ 3,200,000      
Estimated life                                     12 months      
Amortization expense                                     $ 1,500,000      
Number of properties, assumed mortgage | facility                                     1      
Units issued                                     $ 12,300,000      
Assumed mortgage debt, at fair value                                     6,200,000      
Outstanding principal balance of mortgage debt assumed on acquisitions                                     5,900,000      
Premium on debt assumed on acquisitions                                     $ 300,000      
2016 Acquisitions                                            
Self-storage facilities                                            
Number of self-storage facilities acquired                                     28 28    
Aggregate purchase price                                       $ 403,550,000    
Intangible value of the in-place leases                                     $ 18,800,000      
Estimated life                                     12 months      
Amortization expense                                     $ 8,300,000 10,500,000    
Number of properties, assumed mortgage | facility                                     1      
Assumed mortgage debt, at fair value                                     $ 6,500,000      
Outstanding principal balance of mortgage debt assumed on acquisitions                                     6,300,000      
Premium on debt assumed on acquisitions                                     200,000      
Number of facilities not yet closed                                     3      
2015 Acquisitions                                            
Self-storage facilities                                            
Number of self-storage facilities acquired | facility                                         29  
Aggregate purchase price                                         $ 292,362,000  
2015 Acquisitions | PSI                                            
Self-storage facilities                                            
Aggregate purchase price           $ 109,800,000                                
Intangible value of the in-place leases           $ 6,700,000                                
Estimated life           12 months                                
Amortization expense                                     6,100,000 600,000    
2015 Acquisitions | HSRE                                            
Self-storage facilities                                            
Number of self-storage facilities | facility                         26                  
Number of self-storage facilities acquired | facility                       22                    
Aggregate purchase price                     $ 27,500,000 $ 195,500,000 $ 223,000,000             $ 2,700,000    
Estimated life                                       12 months    
Amortization expense                                     700,000 $ 2,000,000    
Number of properties, assumed mortgage | facility                     4                      
2015 Acquisitions | Self storage under construction | PSI                                            
Self-storage facilities                                            
Number of self-storage facilities | facility           1                                
Aggregate purchase price           $ 6,000,000                                
2015 Acquisitions | Self-storage facilities located in US                                            
Self-storage facilities                                            
Number of self-storage facilities | facility                                       13    
Aggregate purchase price                                       $ 155,000,000    
Intangible value of the in-place leases                                       $ 10,700,000    
Estimated life                                       12 months    
Amortization expense                                     $ 6,000,000 $ 4,700,000    
Number of properties, assumed mortgage | facility                                       1    
Assumed mortgage debt, at fair value                                       $ 2,700,000    
Outstanding principal balance of mortgage debt assumed on acquisitions                                       2,500,000    
Premium on debt assumed on acquisitions                                       200,000    
Number of facilities not yet closed                                       1    
Real Estate Acquisition Expected in 2018 | Self storage under construction                                            
Self-storage facilities                                            
Number of self-storage facilities acquired upon completion of construction | facility                                     1      
2015 Dispositions                                            
Self-storage facilities                                            
Number of self-storage facilities acquired | item                           2 1   3          
Aggregate sale price                                       $ 36,400,000    
2015 Dispositions | Properties in Texas and Florida                                            
Self-storage facilities                                            
Aggregate sale price             $ 37,800,000                              
Gain from sale of real estate, net             $ 14,400,000                              
Self-storage facilities                                            
Self-storage facilities                                            
Number of self-storage facilities acquired | property                                     7 28    
Aggregate purchase price                                     $ 80,700,000 $ 403,600,000    
Self-storage facilities | 2015 Acquisitions | PSI                                            
Self-storage facilities                                            
Number of self-storage facilities | facility           12                                
Aggregate purchase price           $ 115,800,000                                
Texas | 2015 Dispositions | Properties in Texas and Florida                                            
Self-storage facilities                                            
Number of assets sold | item             7                              
Florida | 2015 Dispositions | Properties in Texas and Florida                                            
Self-storage facilities                                            
Number of assets sold | item             1                              
New York | Self storage under construction                                            
Self-storage facilities                                            
Number of facilities under contract | facility                                     4      
Massachusetts | Self storage under construction                                            
Self-storage facilities                                            
Number of facilities under contract | facility                                     1      
New Jersey | Self storage under construction                                            
Self-storage facilities                                            
Number of facilities under contract | facility                                     1      
Illinois                                            
Self-storage facilities                                            
Cash paid for acquisition   $ 9,700,000                                 $ 9,700,000      
Contract amount to purchase real estate                                     11,200,000      
Units issued (in shares) | shares   58,400                                        
Total consideration   $ 11,200,000                                        
Cash paid for acquisition of remaining interest in real estate ventures   $ 9,700,000                                 $ 9,700,000      
Class C units | Illinois                                            
Self-storage facilities                                            
Units issued (in shares) | shares                                     58,400      
Stated value (in dollars per share) | $ / shares                                     $ 25      
Distribution rate (as a percent)                                     3.00%