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EARNINGS PER SHARE - Schedule of the Computation of Basic and Diluted Earnings Per Common Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2025
Sep. 30, 2024
Numerator                
Net income $ 29,016 $ 30,958 $ 19,519 $ 29,771 $ 32,280 $ 95,088 $ 79,493 $ 157,139
Net income attributable to noncontrolling interests (10,589)     (11,070)     (28,601) (62,349)
Net income attributable to National Storage Affiliates Trust 18,427     18,701     50,892 94,790
Distributions to preferred shareholders (5,117)     (5,112)     (15,345) (15,332)
Distributed and undistributed earnings allocated to participating securities (13)     (9)     (35) (34)
Net income attributable to common shareholders - basic 13,297     13,580     35,512 79,424
Net income attributable to common shareholders - diluted $ 13,297     $ 13,580     $ 35,512 $ 79,424
Denominator                
Weighted average shares outstanding - basic (in shares) 76,746     75,760     76,532 77,047
Weighted average shares outstanding - diluted (in shares) 76,746     75,760     76,532 77,047
Earnings per share - basic (in dollars per share) $ 0.17     $ 0.18     $ 0.46 $ 1.03
Earnings per share - diluted (in dollars per share) $ 0.17     $ 0.18     $ 0.46 $ 1.03