Annual report pursuant to Section 13 and 15(d)

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

v3.22.0.1
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 ($)
Jan. 04, 2021
Nov. 30, 2021
USD ($)
Property
Oct. 31, 2021
USD ($)
Sep. 30, 2021
USD ($)
Property
Mar. 31, 2021
USD ($)
Sep. 30, 2020
USD ($)
Property
Jun. 30, 2021
USD ($)
Mar. 31, 2020
USD ($)
Jun. 30, 2021
USD ($)
Property
Dec. 31, 2021
USD ($)
Property
Dec. 31, 2020
USD ($)
Property
Dec. 31, 2019
USD ($)
Property
Apr. 30, 2021
USD ($)
Schedule of Equity Method Investments [Line Items]                            
Excess of investment over net asset due to capitalization of acquisition related costs             $ 1,700              
Number of storage facilities acquired | Property                     112 40    
Settlement of principal balances with non-recourse loans             $ 34,000              
Number Of Properties Sold | Property             4              
Gain on sale of storage facilities             $ 2,100       $ 0 $ 0 $ 104,353  
Distributions from unconsolidated joint ventures                     13,866 14,098 10,165  
Cash payments for acquisition                     1,514,684 520,943 393,298  
Mortgages payable                     37,030 37,777    
Rent paid during the period                     $ 1,500 1,300 $ 1,200  
Payments to acquire businesses and interest in affiliates                       $ 3,404    
Urban Box Coralway Storage, LLC [Member]                            
Schedule of Equity Method Investments [Line Items]                            
Company common ownership interest                       100.00%    
Cash payments for acquisition                       $ 7,800    
Payoff of mortgage loan                       $ 7,100    
Ownership percentage acquired                       15.00%    
CA [Member]                            
Schedule of Equity Method Investments [Line Items]                            
Payments to acquire businesses and interest in affiliates                          
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                  
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] | Common Stock Shares [Member]                            
Schedule of Equity Method Investments [Line Items]                            
Total consideration acquired                     $ 8,200      
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] | NY [Member]                            
Schedule of Equity Method Investments [Line Items]                            
Number of joint venture developing self-storage facilities | Property                     2      
Joint Ventures With Properties In Development Stage [Member] | AZ [Member]                            
Schedule of Equity Method Investments [Line Items]                            
Number of joint venture developing self-storage facilities | Property                     1      
Life Storage ArrowMark Venture LLC [Member]                            
Schedule of Equity Method Investments [Line Items]                            
Total consideration acquired       $ 1,600                    
Company common ownership interest                     50.00%      
Life Storage Spacemax, LLC [Member]                            
Schedule of Equity Method Investments [Line Items]                            
Company common ownership interest                     40.00%      
Life Storage Virtus, LLC [Member]                            
Schedule of Equity Method Investments [Line Items]                            
Company common ownership interest                     20.00%      
Sovran HHF Storage Holdings LLC [Member]                            
Schedule of Equity Method Investments [Line Items]                            
Total consideration acquired             175,200              
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%      
Distributions from unconsolidated joint ventures $ 31,600                          
Mortgages payable 110,000                          
Mortgage debt paid off $ 69,100                          
Mortgage debt maturity year   2029                        
Life Storage-HIERS Storage LLC [Member]                            
Schedule of Equity Method Investments [Line Items]                            
Company common ownership interest                     20.00%      
Storage Facilities [Member]                            
Schedule of Equity Method Investments [Line Items]                            
Number of storage facilities acquired | Property     13   3         17     5  
Total consideration acquired     $ 290,600   $ 51,700 $ 47,900   $ 320,000            
Contribution of company to joint venture as share in capital     52,000             $ 28,700     $ 5,700  
Distributions from unconsolidated joint ventures         $ 2,800                  
Mortgages payable     $ 145,300         $ 184,000   $ 184,000     $ 27,600  
Mortgage debt maturity year     2029             2021        
Storage Facilities [Member] | Third Party [Member]                            
Schedule of Equity Method Investments [Line Items]                            
Number of storage facilities acquired | Property             17              
Total consideration acquired             $ 42,300              
Storage Facilities [Member] | Life Storage Spacemax, LLC [Member]                            
Schedule of Equity Method Investments [Line Items]                            
Number of storage facilities acquired | Property                         6  
Total consideration acquired                         $ 82,700  
Contribution of company to joint venture as share in capital                       16,300    
Mortgages payable                         42,000  
Storage Facilities [Member] | Life Storage Virtus, LLC [Member]                            
Schedule of Equity Method Investments [Line Items]                            
Total consideration acquired                 $ 21,700          
Contribution of company to joint venture as share in capital                       1,700    
Mortgages payable                       $ 14,000    
Storage Facilities [Member] | Sovran HHF Storage Holdings II LLC [Member]                            
Schedule of Equity Method Investments [Line Items]                            
Number of storage facilities acquired | Property             8              
Storage Facilities [Member] | Life Storage-HIERS Storage LLC [Member]                            
Schedule of Equity Method Investments [Line Items]                            
Total consideration acquired                         $ 56,300