v3.26.1
EARNINGS PER SHARE - Narrative (Details)
3 Months Ended
Mar. 31, 2026
shares
Mar. 31, 2025
shares
OP units | NSA OP, LP    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Unit conversion ratio 1  
OP units | DownREIT Partnership    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Unit conversion ratio 1  
LTIP units | NSA OP, LP    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Unit conversion ratio 1  
LTIP units with vesting based on service or market condition    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Equity interests excluded from computation of diluted earnings per share (in shares) 793,753  
OP units, DownREIT OP units, Subordinated performance units, DownREIT subordinated performance units    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Equity interests excluded from computation of diluted earnings per share (in shares) 57,100,000 58,100,000