Annual report pursuant to Section 13 and 15(d)

Document and Entity Information

v3.8.0.1
Document and Entity Information - USD ($)
12 Months Ended
Dec. 31, 2017
Feb. 12, 2018
Jun. 30, 2017
Document Information [Line Items]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2017    
Document Fiscal Year Focus 2017    
Document Fiscal Period Focus FY    
Trading Symbol LSI    
Entity Registrant Name LIFE STORAGE, INC.    
Entity Central Index Key 0000944314    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer Yes    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Filer Category Large Accelerated Filer    
Entity Common Stock, Shares Outstanding   46,515,831  
Entity Public Float     $ 3,450,482,283
Life Storage LP [Member]      
Document Information [Line Items]      
Entity Registrant Name LIFE STORAGE LP    
Current Fiscal Year End Date --12-31    
Entity Filer Category Large Accelerated Filer    
Entity Public Float     $ 16,115,342