Quarterly report pursuant to Section 13 or 15(d)

Investment in Joint Ventures - Summary of Company's Unconsolidated Joint Ventures (Parenthetical) (Detail)

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Investment in Joint Ventures - Summary of Company's Unconsolidated Joint Ventures (Parenthetical) (Detail)
$ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Apr. 01, 2021
USD ($)
Mar. 31, 2021
USD ($)
Sep. 30, 2020
USD ($)
Property
Mar. 31, 2020
USD ($)
Jun. 30, 2021
USD ($)
Property
Jun. 30, 2020
USD ($)
Property
Dec. 31, 2020
USD ($)
Schedule of Equity Method Investments [Line Items]              
Number of storage facilities acquired | Property         33 6  
Distributions from unconsolidated joint ventures         $ 6,772 $ 6,086  
Cash payment for property acquisition         531,162 124,204  
Mortgages payable         $ 37,406   $ 37,777
Ontario, Canada [Member]              
Schedule of Equity Method Investments [Line Items]              
Number of joint venture developing self-storage facilities | Property         2    
Sovran HHF Storage Holdings LLC [Member]              
Schedule of Equity Method Investments [Line Items]              
Excess of investment over net asset due to capitalization of acquisition related costs         $ 1,700    
Total consideration acquired     $ 175,200        
Settlement of principal balances with non-recourse loans     34,000        
Gain on sale of storage facilities     2,100        
Sovran HHF Storage Holdings LLC [Member] | Third Party [Member]              
Schedule of Equity Method Investments [Line Items]              
Total consideration acquired     $ 42,300        
Sovran HHF Storage Holdings LLC [Member] | Storage Facilities [Member]              
Schedule of Equity Method Investments [Line Items]              
Number of storage facilities acquired | Property     17        
Number Of Properties Sold | Property     4        
Sovran HHF Storage Holdings II LLC [Member]              
Schedule of Equity Method Investments [Line Items]              
Total consideration acquired     $ 120,200        
Cash has been placed into escrow until non-recourse loans     35,800        
Contribution of company to joint venture as share in capital     $ 12,700        
Mortgage debt paid off $ 69,100            
Mortgage debt maturity year 2029            
Distributions from unconsolidated joint ventures $ 31,600            
Mortgages payable 110,000            
Sovran HHF Storage Holdings II LLC [Member] | Storage Facilities [Member]              
Schedule of Equity Method Investments [Line Items]              
Number of storage facilities acquired | Property     8        
191 V Life Storage Holdings, LLC [Member]              
Schedule of Equity Method Investments [Line Items]              
Contribution of company to joint venture as share in capital         $ 28,700    
Mortgage debt maturity year         2026    
Mortgages payable         $ 184,000    
191 V Life Storage Holdings, LLC [Member] | Storage Facilities [Member]              
Schedule of Equity Method Investments [Line Items]              
Number of storage facilities acquired | Property         17    
Total consideration acquired $ 320,000            
Iskalo Office Holdings, LLC [Member]              
Schedule of Equity Method Investments [Line Items]              
Rent paid during the period         $ 700 $ 600  
Life Storage Virtus, LLC [Member]              
Schedule of Equity Method Investments [Line Items]              
Contribution of company to joint venture as share in capital             $ 1,700
Life Storage Virtus, LLC [Member] | Storage Facilities [Member]              
Schedule of Equity Method Investments [Line Items]              
Total consideration acquired       $ 21,700      
Mortgages payable       $ 14,000      
SNL Orix Merrick, LLC [Member]              
Schedule of Equity Method Investments [Line Items]              
Total consideration acquired   $ 47,900          
Joint Ventures with Properties in Development Stage [Member]              
Schedule of Equity Method Investments [Line Items]              
Number Of joint ventures | Property         7    
Joint Ventures with Properties in Development Stage [Member] | NY [Member]              
Schedule of Equity Method Investments [Line Items]              
Number of joint venture developing self-storage facilities | Property         4    
Joint Ventures with Properties in Development Stage [Member] | Tucson, AZ [Member]              
Schedule of Equity Method Investments [Line Items]              
Number of joint venture developing self-storage facilities | Property         1    
Joint Ventures with Properties in Development Stage [Member] | Common Stock Shares [Member]              
Schedule of Equity Method Investments [Line Items]              
Total consideration acquired         $ 11,700