Annual report pursuant to Section 13 and 15(d)

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

v3.22.0.1
Investment in Joint Ventures - Summary of Company's Unconsolidated Joint Ventures (Detail)
$ in Millions
12 Months Ended
Dec. 31, 2021
USD ($)
Property
Dec. 31, 2020
USD ($)
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 $ 58.7 $ 60.5
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 $ (2.4) 27.3
191 V Life Storage Holdings [Member]    
Schedule of Equity Method Investments [Line Items]    
Number of Properties | Property 17  
Company common ownership interest 20.00%  
Carrying value of investment $ 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 $ 51.5  
Life Storage-SERS Storage LLC [Member]    
Schedule of Equity Method Investments [Line Items]    
Number of Properties | Property 0  
Company common ownership interest 20.00%  
Carrying value of investment   3.0
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 $ 13.9 14.3
Iskalo Office Holdings, LLC [Member]    
Schedule of Equity Method Investments [Line Items]    
Company common ownership interest 49.00%  
Carrying value of investment $ (2.4) (2.5)
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 $ 14.5 16.7
Life Storage Virtus, LLC [Member]    
Schedule of Equity Method Investments [Line Items]    
Number of Properties | Property 1  
Company common ownership interest 20.00%  
Carrying value of investment $ 1.3 1.5
SNL Orix Merrick, LLC [Member]    
Schedule of Equity Method Investments [Line Items]    
Number of Properties | Property 0  
Company common ownership interest 5.00%  
Carrying value of investment   2.5
Life Storage 898 McDonald LLC ("McDonald") [Member]    
Schedule of Equity Method Investments [Line Items]    
Number of Properties | Property 1  
Company common ownership interest 86.00%  
Carrying value of investment $ 30.0 2.7
Life Storage ArrowMark Venture LLC [Member]    
Schedule of Equity Method Investments [Line Items]    
Company common ownership interest 50.00%  
Carrying value of investment $ 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 $ 8.2 7.4
Other Unconsolidated Joint Ventures [Member]    
Schedule of Equity Method Investments [Line Items]    
Number of Properties | Property 7  
Company common ownership interest Various  
Carrying value of investment $ 6.1 $ 7.1