Quarterly report pursuant to Section 13 or 15(d)

Organization - Additional Information (Detail)

v3.10.0.1
Organization - Additional Information (Detail)
9 Months Ended
Sep. 30, 2018
Property
State
shares
Dec. 31, 2017
shares
Organization [Line Items]    
Number of self-storage properties owned and managed 725  
Number of states in which self-storage properties owned and managed | State 28  
Number of properties managed under joint ventures 101  
Number of properties managed with no ownership 57  
Noncontrolling limited partnership unit redemption value one common share or cash  
Geographic Concentration Risk [Member] | Texas [Member] | Revenue [Member]    
Organization [Line Items]    
Concentration risk, percentage 21.00%  
Geographic Concentration Risk [Member] | Florida [Member] | Revenue [Member]    
Organization [Line Items]    
Concentration risk, percentage 13.00%  
Life Storage LP [Member]    
Organization [Line Items]    
Percentage of ownership interest of the subsidiary and its limited partnership which controls the operations of the Operating Partnership 99.50%  
Units of redeemable noncontrolling interest in operating partnership | shares 215,009 217,481
Warehouse Anywhere LLC [Member] | Life Storage Solutions, LLC [Member]    
Organization [Line Items]    
Percentage of ownership interest of the subsidiary and its limited partnership which controls the operations of the Operating Partnership 60.00%