Annual report pursuant to Section 13 and 15(d)

EARNINGS PER SHARE - Basic and Diluted Earnings per Share (Details)

v3.3.1.900
EARNINGS PER SHARE - Basic and Diluted Earnings per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Numerator                        
Net income (loss) $ 5,365 $ 2,109 $ 93 $ (2,771) $ (2,371) $ (5,025) $ (6,158) $ (2,803) $ (10,481) $ 4,796 $ (16,357)  
Net loss attributable to noncontrolling interests                 10,481 7,644 16,357  
Net income (loss) attributable to National Storage Affiliates Trust and NSA predecessor $ 4,604 $ 4,372 $ 3,464 $ 0 $ 0 $ 0 $ 0 $ 0 0 12,440 0  
Distributed and undistributed earnings allocated to participating securities                 0 (9) 0  
Net income (loss) attributable to common shareholders - basic                 0 12,431 0  
Effect of assumed conversion of dilutive securities                 0 (4,919) 0  
Net income (loss) attributable to common shareholders - diluted                 $ 0 $ 7,512 $ 0  
Denominator                        
Weighted average shares outstanding (basic) (in shares)                 1 15,463 1  
Weighted average shares outstanding (diluted) (in shares)                 1 45,409 1  
Earnings (loss) per share (basic) (in dollars per share) $ 0.20 $ 0.19 $ 0.22 $ 0.00 $ 0.00 $ 0.00 $ 0.00 $ 0.00 $ 0.00 $ 0.80 $ 0.00  
Earnings (loss) per share (diluted) (in dollars per share) $ 0.08 $ 0.03 $ 0.00 $ 0.00 $ 0.00 $ 0.00 $ 0.00 $ 0.00 $ 0.00 0.17 0.00  
Dividends declared per common share (in dollars per share)                   $ 0.54 $ 0.00 $ 0.00
OP units [Member]                        
Denominator                        
Effect of dilutive securities (in shares)                 0 15,697 0  
DownREIT OP units [Member]                        
Denominator                        
Effect of dilutive securities (in shares)                 0 1,171 0  
LTIP units [Member]                        
Denominator                        
Effect of dilutive securities (in shares)                 0 1,272 0  
Class B And DownREIT Class B Units [Member]                        
Denominator                        
Effect of dilutive securities (in shares)                 0 11,806 0