Quarterly report pursuant to Section 13 or 15(d)

DOCUMENT AND ENTITY INFORMATION

v3.7.0.1
DOCUMENT AND ENTITY INFORMATION - shares
6 Months Ended
Jun. 30, 2017
Aug. 02, 2017
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 Accelerated Filer  
Document Type 10-Q  
Document Period End Date Jun. 30, 2017  
Document Fiscal Year Focus 2017  
Document Fiscal Period Focus Q2  
Amendment Flag false  
Entity Common Stock, Shares Outstanding   44,296,944