Quarterly report pursuant to Section 13 or 15(d)

COVER PAGE

v3.20.1
COVER PAGE - shares
3 Months Ended
Mar. 31, 2020
May 08, 2020
Entity Information [Line Items]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Mar. 31, 2020  
Document Transition Report false  
Entity File Number 001-37351  
Entity Registrant Name National Storage Affiliates Trust  
Entity Central Index Key 0001618563  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2020  
Document Fiscal Period Focus Q1  
Amendment Flag false  
Entity Incorporation, State or Country Code MD  
Entity Tax Identification Number 46-5053858  
Entity Address, Address Line One 8400 East Prentice Avenue, 9th Floor  
Entity Address, City or Town Greenwood Village  
Entity Address, State or Province CO  
Entity Address, Postal Zip Code 80111  
City Area Code 720  
Local Phone Number 630-2600  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   68,143,770
Common Shares of Beneficial Interest, $0.01 par value per share    
Entity Information [Line Items]    
Title of 12(b) Security Common Shares of Beneficial Interest, $0.01 par value per share  
Trading Symbol NSA  
Security Exchange Name NYSE  
Series A Cumulative Redeemable Preferred Shares of Beneficial Interest, par value $0.01 per share    
Entity Information [Line Items]    
Title of 12(b) Security Series A Cumulative Redeemable Preferred Shares of Beneficial Interest, par value $0.01 per share  
Trading Symbol NSA Pr A  
Security Exchange Name NYSE