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
Apr. 01, 2021
USD ($)
Apr. 30, 2022
USD ($)
Dec. 31, 2021
USD ($)
Property
Oct. 31, 2021
USD ($)
Sep. 30, 2021
USD ($)
Jun. 30, 2021
USD ($)
Property
Sep. 30, 2020
USD ($)
Property
Mar. 31, 2022
USD ($)
Property
Mar. 31, 2021
USD ($)
Property
Apr. 30, 2021
USD ($)
Schedule of Equity Method Investments [Line Items]                    
Number of storage facilities acquired | Property               18 16  
Total consideration acquired               $ 51,700    
Distributions from unconsolidated joint ventures         $ 2,800     4,024 $ 2,547  
Rent paid during the period               400    
Mortgages payable     $ 37,030         36,837    
Storage Facilities [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Number of storage facilities acquired | Property     13     17        
Total consideration acquired     $ 290,600     $ 320,000        
Contribution of company to joint venture as share in capital     $ 52,000     $ 28,700        
Mortgage debt maturity year     2029     2026        
Mortgages payable     $ 145,300     $ 184,000        
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    
Company common ownership interest               20.00%    
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      
Company common ownership interest               15.00%    
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      
Life Storage ArrowMark Venture LLC [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Total consideration acquired       $ 1,600            
Company common ownership interest               50.00%    
SNL Orix 1200 McDonald Ave., LLC [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Contribution of company to joint venture as share in capital         $ 27,300          
Asset Acquisition, Consideration Transferred   $ 5,200                
SNL Orix 1200 McDonald Ave., LLC [Member] | Minimum [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Company common ownership interest         5.00%          
SNL Orix 1200 McDonald Ave., LLC [Member] | Maximum [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Company common ownership interest         86.00%          
Joint Ventures with Properties in Development Stage [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Number Of joint ventures | Property               4    
Joint Ventures with Properties in Development Stage [Member] | Ontario, Canada [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] | 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               $ 9,400