Quarterly report pursuant to Section 13 or 15(d)

DOCUMENT AND ENTITY INFORMATION

v3.19.1
DOCUMENT AND ENTITY INFORMATION - shares
3 Months Ended
Mar. 31, 2019
May 02, 2019
Document And Entity Information [Abstract]    
Entity Registrant Name National Storage Affiliates Trust  
Entity Central Index Key 0001618563  
Current Fiscal Year End Date --12-31  
Entity Filer Category Large Accelerated Filer  
Document Type 10-Q  
Document Period End Date Mar. 31, 2019  
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q1  
Amendment Flag false  
Entity Common Stock, Shares Outstanding   56,882,863