Quarterly report pursuant to Section 13 or 15(d)

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

v3.2.0.727
EARNINGS PER SHARE - Basic and Diluted Earnings per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Net income (loss) $ 93 $ (6,158) $ (2,678) $ (8,961)
Net loss attributable to noncontrolling interests 3,371 6,158 6,142 8,961
Net income (loss) attributable to National Storage Affiliates Trust 3,464 0 3,464 0
Distributed and undistributed earnings allocated to participating securities (3) 0 (3) 0
Net income (loss) attributable to common shareholders - basic 3,461 0 3,461 0
Effect of assumed conversion of dilutive securities (3,371) 0 (3,371) 0
Net income (loss) attributable to common shareholders - diluted $ 90 $ 0 $ 90 $ 0
Weighted average shares outstanding (basic) (in shares) 15,517 1 7,802 1
Weighted average shares outstanding (diluted) (in shares) 52,565 1 26,327 1
Earnings (loss) per share (basic) (in dollars per share) $ 0.22 $ 0.00 $ 0.44 $ 0.00
Earnings (loss) per share (diluted) (in dollars per share) $ 0.00 $ 0.00 $ 0.00 $ 0.00
OP units [Member] | DownREIT Partnership [Member]        
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Effect of dilutive securities (in shares) 1,415 0 708 0
OP units [Member] | NSA OP, LP [Member]        
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Effect of dilutive securities (in shares) 20,208 0 10,104 0
LTIP units [Member] | NSA OP, LP [Member]        
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Effect of dilutive securities (in shares) 1,247 0 624 0
Subordinated performance units [Member] | NSA OP, LP And DownREIT Partnership [Member]        
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Effect of dilutive securities (in shares) 14,178 0 7,089 0