Quarterly report pursuant to Section 13 or 15(d)

ORGANIZATION AND NATURE OF OPERATIONS (Details)

v3.4.0.3
ORGANIZATION AND NATURE OF OPERATIONS (Details)
$ / shares in Units, storage_unit in Thousands, ft² in Millions, $ in Millions
Apr. 28, 2015
USD ($)
$ / shares
shares
Jun. 07, 2013
shares
Feb. 13, 2013
Mar. 31, 2016
ft²
storage_unit
state
property
$ / shares
Dec. 31, 2015
$ / shares
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]          
Common shares of beneficial interest, par value (in dollars per share) | $ / shares       $ 0.01 $ 0.01
Number of self storage properties owned | property       293  
Number of states that self storage properties are owned in | state       17  
Total rentable square feet in self storage properties | ft²       16.8  
Number of storage units owned | storage_unit       130  
National Storage Affiliates Holdings LLC [Member]          
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]          
Percentage of NSA owned by NBSA Holdings prior to IPO     100.00%    
OP units [Member] | NSA OP, LP [Member]          
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]          
Amount of OP units issued in exchange for common shares from initial public offering (in shares) 23,000,000        
OP units [Member] | National Storage Affiliates Holdings LLC [Member]          
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]          
OP Units owned by NSA Holdings prior to IPO (in shares)   126,400      
Common Shares [Member]          
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]          
Shares offered during initial public offering   1,000      
Common shares of beneficial interest, par value (in dollars per share) | $ / shares       $ 0.01  
Net proceeds from issuance of common shares in IPO | $ $ 278.1        
Common Shares [Member] | IPO [Member]          
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]          
Shares offered during initial public offering 23,000,000        
IPO share price (in dollars per share) | $ / shares $ 13.00        
Common Shares [Member] | Over-Allotment Option [Member]          
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]          
Shares offered during initial public offering 3,000,000