Annual report pursuant to Section 13 and 15(d)

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

v3.6.0.2
EARNINGS PER SHARE - Basic and Diluted Earnings per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Numerator                      
Net income (loss) $ 6,075 $ 7,944 $ 6,045 $ 4,802 $ 5,365 $ 2,109 $ 93 $ (2,771) $ 24,866 $ 4,796 $ (16,357)
Net (income) loss attributable to noncontrolling interests                 (6,901) 7,644 16,357
Net income (loss) attributable to National Storage Affiliates Trust $ 8,396 $ (11) $ 7,370 $ 2,210 $ 4,604 $ 4,372 $ 3,464 $ 0 17,965 12,440 0
Distributed and undistributed earnings allocated to participating securities                 (18) (9) 0
Net income (loss) attributable to common shareholders - basic                 17,947 12,431 0
Effect of assumed conversion of dilutive securities                 6,783 (4,919) 0
Net income (loss) attributable to common shareholders - diluted                 $ 24,730 $ 7,512 $ 0
Denominator                      
Weighted average shares outstanding (basic) (in shares)                 29,887 15,463 1
Weighted average shares outstanding (diluted) (in shares)                 78,747 45,409 1
Earnings (loss) per share (basic) (in dollars per share) $ 0.22 $ 0.00 $ 0.32 $ 0.10 $ 0.20 $ 0.19 $ 0.22 $ 0.00 $ 0.60 $ 0.80 $ 0.00
Earnings (loss) per share (diluted) (in dollars per share) $ 0.07 $ 0.00 $ 0.08 $ 0.07 $ 0.08 $ 0.03 $ 0.00 $ 0.00 0.31 0.17 0.00
Dividends declared per common share (in dollars per share)                 $ 0.88 $ 0.54 $ 0
OP units [Member] | NSA OP, LP [Member]                      
Denominator                      
Effect of dilutive securities (in shares)                 24,262 15,697 0
OP units [Member] | DownREIT Partnership [Member]                      
Denominator                      
Effect of dilutive securities (in shares)                 1,835 1,171 0
LTIP units [Member] | NSA OP, LP [Member]                      
Denominator                      
Effect of dilutive securities (in shares)                 1,846 1,272 0
Subordinated performance units [Member] | NSA OP, LP And DownREIT Partnership [Member]                      
Denominator                      
Effect of dilutive securities (in shares)                 20,917 11,806 0