Quarterly report pursuant to Section 13 or 15(d)

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

v3.20.2
Investment in Joint Ventures - Summary of Company's Unconsolidated Joint Ventures (Detail)
$ in Millions
6 Months Ended
Jun. 30, 2020
USD ($)
Property
Dec. 31, 2019
USD ($)
Sovran HHF Storage Holdings LLC [Member]    
Schedule of Equity Method Investments [Line Items]    
Number of Properties | Property 57  
Company common ownership interest 20.00%  
Carrying value of investment $ 81.6 $ 83.1
Sovran HHF Storage Holdings II LLC [Member]    
Schedule of Equity Method Investments [Line Items]    
Number of Properties | Property 30  
Company common ownership interest 15.00%  
Carrying value of investment $ 14.0 13.9
191 III Life Storage Holdings LLC [Member]    
Schedule of Equity Method Investments [Line Items]    
Company common ownership interest 20.00%  
Carrying value of investment   8.9
Life Storage-SERS Storage LLC [Member]    
Schedule of Equity Method Investments [Line Items]    
Number of Properties | Property 3  
Company common ownership interest 20.00%  
Carrying value of investment $ 3.0 3.2
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 $ 14.5 14.9
Iskalo Office Holdings, LLC [Member]    
Schedule of Equity Method Investments [Line Items]    
Company common ownership interest 49.00%  
Carrying value of investment $ (0.3) (0.4)
Bluebird Sanford Storage LP [Member]    
Schedule of Equity Method Investments [Line Items]    
Number of Properties | Property 1  
Company common ownership interest 15.00%  
Carrying value of investment $ 0.3 0.3
Bluebird Ingram Storage LP [Member]    
Schedule of Equity Method Investments [Line Items]    
Number of Properties | Property 1  
Company common ownership interest 15.00%  
Carrying value of investment $ 1.1 1.2
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 $ 16.9 16.1
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 $ 1.6  
Joint Ventures with Properties in Development Stage [Member]    
Schedule of Equity Method Investments [Line Items]    
Number of Properties | Property 5  
Company common ownership interest Various  
Carrying value of investment $ 2.9 3.1
Other Unconsolidated Joint Ventures [Member]    
Schedule of Equity Method Investments [Line Items]    
Number of Properties | Property 6  
Company common ownership interest Various  
Carrying value of investment $ 11.8 $ 10.3