Annual report pursuant to Section 13 and 15(d)

RELATED PARTY TRANSACTIONS - Narrative (Details)

v3.22.0.1
RELATED PARTY TRANSACTIONS - Narrative (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2021
USD ($)
shares
Dec. 31, 2021
USD ($)
property
Sep. 30, 2021
USD ($)
property
Jun. 30, 2021
USD ($)
property
Mar. 31, 2021
USD ($)
property
Dec. 31, 2020
USD ($)
property
Sep. 30, 2020
USD ($)
property
Jun. 30, 2020
USD ($)
property
Mar. 31, 2020
USD ($)
property
Dec. 31, 2021
USD ($)
property
shares
Dec. 31, 2020
USD ($)
property
tranche
shares
Dec. 31, 2019
USD ($)
Related Party Transaction [Line Items]                        
Payroll and related costs reimbursed to the PROs by the Company                   $ 155,265 $ 123,486 $ 110,347
Number of properties acquired | property   110 76 20 23 33 4 4 36 229 77  
Asset acquisition consideration   $ 1,140,393 $ 599,277 $ 269,393 $ 165,963 $ 260,508 $ 23,804 $ 36,247 $ 222,773 $ 2,175,026 $ 543,332  
Value of OP Equity   $ 117,026 $ 31,074 $ 24,102 $ 22,897 $ 20,747 $ 3,427 $ 5,842 $ 7,217 $ 195,099 37,233  
Reinsurance Company                        
Related Party Transaction [Line Items]                        
Ownership interest in reinsurance company acquired (percent) 0.54% 0.54%               0.54%    
OP units | Reinsurance Company                        
Related Party Transaction [Line Items]                        
OP units issued in acquisition (in shares) | shares                   96,256    
Supervisory and administrative fee agreement | Management | Participating Regional Operator (PRO)                        
Related Party Transaction [Line Items]                        
Supervisory and administrative fees paid to the PROs                   $ 20,400 16,400 20,000
Supervisory and administrative fee agreement | Management | Participating Regional Operator (PRO) | Minimum                        
Related Party Transaction [Line Items]                        
Supervisory and administrative fee arrangement of gross revenue (percent)                   5.00%    
Supervisory and administrative fee agreement | Management | Participating Regional Operator (PRO) | Maximum                        
Related Party Transaction [Line Items]                        
Supervisory and administrative fee arrangement of gross revenue (percent)                   6.00%    
Payroll services | Management | Participating Regional Operator (PRO)                        
Related Party Transaction [Line Items]                        
Payroll and related costs reimbursed to the PROs by the Company                   $ 27,900 25,900 32,000
Due diligence costs | Management | Participating Regional Operator (PRO)                        
Related Party Transaction [Line Items]                        
Due diligence expenses payable to the PROs                   $ 1,700 $ 500 $ 700
Self Storage Property Purchase | Affiliate Entity Via Trustee                        
Related Party Transaction [Line Items]                        
Number of properties acquired | property                   8 1  
Asset acquisition consideration                   $ 102,700 $ 8,300  
Asset Acquisition, Contingent Consideration, Number Of Tranches Based On Performance Of Property | tranche                     3  
Self Storage Property Purchase | Affiliate Entity Via Trustee | Six month tranche                        
Related Party Transaction [Line Items]                        
Asset Acquisition, Contingent Consideration, Performance Period                     6 months  
Self Storage Property Purchase | Affiliate Entity Via Trustee | 12 month and 18 month tranches                        
Related Party Transaction [Line Items]                        
Asset acquisition consideration                   $ 4,100    
Shares issued in connection with asset acquisition (in shares) | shares                   22,794    
Value of OP Equity                   $ 1,200    
Self Storage Property Purchase | Affiliate Entity Via Trustee | 12 month tranche                        
Related Party Transaction [Line Items]                        
Asset Acquisition, Contingent Consideration, Performance Period                     12 months  
Self Storage Property Purchase | Affiliate Entity Via Trustee | 18 month tranche                        
Related Party Transaction [Line Items]                        
Asset Acquisition, Contingent Consideration, Performance Period                     18 months  
Self Storage Property Purchase | Affiliate Entity Via Trustee | Mr. J. Timothy Warren | OP units                        
Related Party Transaction [Line Items]                        
Shares issued in connection with asset acquisition (in shares) | shares                     16,620  
Value of OP Equity                     $ 500  
Self Storage Property Purchase | Affiliated entity                        
Related Party Transaction [Line Items]                        
Number of properties acquired | property                     1  
Asset acquisition consideration                     $ 7,500  
Self Storage Property Purchase | Affiliated entity | OP units                        
Related Party Transaction [Line Items]                        
Shares issued in connection with asset acquisition (in shares) | shares                   31,869    
Value of OP Equity                   $ 2,100    
Self Storage Property Purchase | Affiliated entity | Mr. Arlen Nordhagen | OP units                        
Related Party Transaction [Line Items]                        
Shares issued in connection with asset acquisition (in shares) | shares                     58,376  
Equity issued in acquisition                     $ 1,500  
Self Storage Property Purchase | Affiliated entity | Mr. David Cramer | OP units                        
Related Party Transaction [Line Items]                        
Shares issued in connection with asset acquisition (in shares) | shares                     29,689  
Equity issued in acquisition                     $ 700  
Self Storage Property Purchase | Affiliated Entity via Trustee and Trustee's Children | OP units                        
Related Party Transaction [Line Items]                        
Shares issued in connection with asset acquisition (in shares) | shares                   171,439    
Value of OP Equity                   $ 10,200    
Acquisition of interest in reinsurance company | Reinsurance Company                        
Related Party Transaction [Line Items]                        
Equity interest in reinsurance company $ 100 $ 100               100    
Acquisition of interest in reinsurance company | Tenant reinsurance intangible | Reinsurance Company                        
Related Party Transaction [Line Items]                        
Recognized fair value allocated to intangible assets $ 9,400 $ 9,400               $ 9,400    
Weighted average remaining useful life (in years) 25 years                      
Acquisition of interest in reinsurance company | Kevin Howard Real Estate, Inc. | Reinsurance Company                        
Related Party Transaction [Line Items]                        
Consideration in acquisition transaction $ 9,500                      
Cash paid in acquisition $ 2,900                      
Acquisition of interest in reinsurance company | Kevin Howard Real Estate, Inc. | OP units | Reinsurance Company                        
Related Party Transaction [Line Items]                        
OP units issued in acquisition (in shares) | shares 96,256                      
Value of OP units issued in acquisition $ 6,600                      
Acquisition of interest in reinsurance company | Affiliated entity | OP units | Reinsurance Company                        
Related Party Transaction [Line Items]                        
OP units issued in acquisition (in shares) | shares 48,128                      
Value of OP units issued in acquisition $ 3,300