Annual report pursuant to Section 13 and 15(d)

SELF STORAGE PROPERTY ACQUISITIONS AND DISPOSITIONS - Narrative (Details)

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SELF STORAGE PROPERTY ACQUISITIONS AND DISPOSITIONS - Narrative (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
property
Sep. 30, 2020
property
Jun. 30, 2020
property
Mar. 31, 2020
USD ($)
property
Dec. 31, 2019
USD ($)
property
Sep. 30, 2019
property
Jun. 30, 2019
property
Mar. 31, 2019
property
Dec. 31, 2020
USD ($)
property
Dec. 31, 2019
USD ($)
property
Feb. 24, 2020
shares
Schedule of Asset Acquisition [Line Items]                        
Number of properties acquired | property   33 4 4 36 7 6 24 32 77 69  
Estimated fair value of net assets acquired                   $ 543,300 $ 447,800  
Acquisition-related costs capitalized                   4,700 3,600  
Aggregate revenue related to properties acquired during the year                   21,300 30,400  
Operating income related to properties acquired during the year                   (300) 2,500  
Goodwill   $ 8,182       $ 5,750       8,182 $ 5,750  
Number of self storage properties sold | property                     1  
Gross selling price of self storage property sold           $ 6,500         $ 6,500  
Gain on sale of self storage properties                     2,800  
SecurCare and DLAN                        
Schedule of Asset Acquisition [Line Items]                        
Recognized fair value allocated to real estate $ 100       $ 100              
Goodwill   $ 2,400               2,400    
SecurCare and DLAN | Trade names                        
Schedule of Asset Acquisition [Line Items]                        
Intangible assets $ 3,200       3,200              
SecurCare | OP units                        
Schedule of Asset Acquisition [Line Items]                        
Units to be issued for internalization transaction (in units) | shares                       348,020
SecurCare | OP units | SecurCare and DLAN                        
Schedule of Asset Acquisition [Line Items]                        
Value of OP units issued in acquisition         10,300              
Real Estate                        
Schedule of Asset Acquisition [Line Items]                        
Recognized fair value allocated to real estate                   531,600 436,900  
Customer in-place leases                        
Schedule of Asset Acquisition [Line Items]                        
Recognized fair value allocated to intangible assets                   $ 11,700 $ 10,900  
Estimated useful life                   12 months    
Management contract                        
Schedule of Asset Acquisition [Line Items]                        
Estimated useful life 15 years                 15 years    
Management contract | SecurCare and DLAN                        
Schedule of Asset Acquisition [Line Items]                        
Recognized fair value allocated to intangible assets $ 4,600       $ 4,600              
Asset acquired from PROs | Affiliated entity                        
Schedule of Asset Acquisition [Line Items]                        
Number of properties acquired | property                   11 19  
Estimated fair value of net assets acquired                   $ 92,900 $ 131,300  
Asset acquired from 2016 Joint Venture | Joint Venture                        
Schedule of Asset Acquisition [Line Items]                        
Number of properties acquired | property                   1 1  
Estimated fair value of net assets acquired                   $ 4,100