Quarterly report pursuant to Section 13 or 15(d)

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

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Investment in Joint Ventures - Summary of Company's Unconsolidated Joint Ventures (Detail)
$ in Millions
3 Months Ended
Mar. 31, 2022
USD ($)
Property
Dec. 31, 2021
USD ($)
Sovran HHF Storage Holdings LLC [Member]    
Schedule of Equity Method Investments [Line Items]    
Number of Properties | Property 36  
Company common ownership interest 20.00%  
Carrying value of investment $ 58.1 $ 58.7
Sovran HHF Storage Holdings II LLC [Member]    
Schedule of Equity Method Investments [Line Items]    
Number of Properties | Property 22  
Company common ownership interest 15.00%  
Carrying value of investment $ (2.5) (2.4)
Life Storage-HIERS Storage LLC [Member]    
Schedule of Equity Method Investments [Line Items]    
Number of Properties | Property 17  
Company common ownership interest 20.00%  
Carrying value of investment $ 13.7 13.9
191 V Life Storage Holdings, LLC [Member]    
Schedule of Equity Method Investments [Line Items]    
Number of Properties | Property 17  
Company common ownership interest 20.00%  
Carrying value of investment $ 27.6 27.4
GII Life Storage Holdings LLC [Member]    
Schedule of Equity Method Investments [Line Items]    
Number of Properties | Property 13  
Company common ownership interest 35.00%  
Carrying value of investment $ 50.6 51.5
Iskalo Office Holdings, LLC [Member]    
Schedule of Equity Method Investments [Line Items]    
Company common ownership interest 49.00%  
Carrying value of investment $ (2.3) (2.4)
Life Storage Spacemax, LLC [Member]    
Schedule of Equity Method Investments [Line Items]    
Number of Properties | Property 6  
Company common ownership interest 40.00%  
Carrying value of investment $ 14.2 14.5
Life Storage 898 McDonald, LLC [Member]    
Schedule of Equity Method Investments [Line Items]    
Number of Properties | Property 1  
Company common ownership interest 86.00%  
Carrying value of investment $ 30.2 30.0
Life Storage ArrowMark Venture LLC [Member]    
Schedule of Equity Method Investments [Line Items]    
Company common ownership interest 50.00%  
Carrying value of investment $ 1.6 1.5
Joint Ventures with Properties in Development Stage [Member]    
Schedule of Equity Method Investments [Line Items]    
Number of Properties | Property 4  
Company common ownership interest Various  
Carrying value of investment $ 9.4 8.2
Other Unconsolidated Joint Ventures [Member]    
Schedule of Equity Method Investments [Line Items]    
Number of Properties | Property 9  
Company common ownership interest Various  
Carrying value of investment $ 9.2 $ 7.4