Annual report pursuant to Section 13 and 15(d)

SHAREHOLDERS' EQUITY AND NONCONTROLLING INTERESTS - Narrative (Details)

v3.24.0.1
SHAREHOLDERS' EQUITY AND NONCONTROLLING INTERESTS - Narrative (Details)
$ / shares in Units, $ in Thousands
 12 Months Ended
Mar. 16, 2023
USD ($)
property
shares
Mar. 15, 2023
shares
Jan. 01, 2023
shares
Jul. 23, 2021
USD ($)
$ / shares
shares
Feb. 27, 2019
USD ($)
Dec. 31, 2023
USD ($)
property
$ / shares
shares
Dec. 31, 2022
USD ($)
shares
Dec. 31, 2021
USD ($)
shares
Jul. 11, 2022
USD ($)
May 19, 2021
USD ($)
Class of Stock [Line Items]                    
Number of properties | property           1,050        
Repurchase amount | $           $ 275,000     $ 400,000  
Repurchase of common shares (in shares)           8,836,639        
Repurchase of common shares | $           $ 310,152 $ 90,109 $ 0    
Common Shares                    
Class of Stock [Line Items]                    
Issuance of shares/units (in shares)               19,196,216    
Repurchase of common shares (in shares)           8,836,639 1,986,175      
Redemptions/conversions of units (in shares)             627,896 700,326    
Series B Preferred Stock                    
Class of Stock [Line Items]                    
Preferred stock, shares tied to promissory note 1,059,683                  
Series B Preferred Stock | Personal Mini                    
Class of Stock [Line Items]                    
Issuance of shares/units (in shares) 5,668,128                  
Preferred stock, value, issued | $ $ 139,600                  
Number of properties | property 15                  
Financing receivable, after allowance for credit loss | $ $ 26,100                  
Series A and B Preferred shares of beneficial interest, shares authorized, issued and outstanding at liquidation preference | $ 26,100                  
Proceeds from issuance of preferred stock and preference stock | $ 113,100                  
Subordinated performance units                    
Class of Stock [Line Items]                    
Unit conversion, lock out period           1 year        
Percentage of CAD per unit used in conversion rate calculation     110.00%     110.00%        
OP units | Common Shares                    
Class of Stock [Line Items]                    
Redemptions/conversions of units (in shares)           1,275,854        
NSA OP, LP | Series B Preferred Stock                    
Class of Stock [Line Items]                    
Preferred stock, dividend rate, percentage   6.00%                
Preferred shares of beneficial interest, authorized (in shares)   7,000,000                
Preferred shares of beneficial interest, par value (in dollars per share) | $ / shares           $ 25.00        
NSA OP, LP | Series A-1 preferred units                    
Class of Stock [Line Items]                    
Preferred stock, dividend rate, percentage           6.00%        
Preferred shares of beneficial interest, par value (in dollars per share) | $ / shares           $ 25.00        
Unit conversion ratio           1        
Minimum conversion period (in years)           10 years        
Stock issued during period, shares, lease termination           33,441        
NSA OP, LP | Series A-1 preferred units | Series of Individually Immaterial Asset Acquisitions                    
Class of Stock [Line Items]                    
Shares issued in connection with asset acquisition (in shares)           466,691        
NSA OP, LP | Subordinated performance units                    
Class of Stock [Line Items]                    
Minimum conversion period (in years)           2 years        
Conversion of units, non-voluntary (in units)           926,623        
Number of units requested for conversion (in units)           23,690        
Unit conversion, lock out period (in years)           2 years        
NSA OP, LP | Subordinated performance units | Series of Individually Immaterial Asset Acquisitions                    
Class of Stock [Line Items]                    
Redemptions/conversions of units (in shares)           397,000        
NSA OP, LP | Subordinated performance units | Retirement of Northwest                    
Class of Stock [Line Items]                    
Issuance of shares/units (in shares)           1,160,370        
Conversion of units, non-voluntary (in units)           926,623        
NSA OP, LP | OP units                    
Class of Stock [Line Items]                    
Issuance of shares/units (in shares)     43,556     2,545,063        
Unit conversion ratio           1        
Minimum conversion period (in years)           1 year        
NSA OP, LP | OP units | Common Shares                    
Class of Stock [Line Items]                    
Redemptions/conversions of units (in shares)           1,275,854        
NSA OP, LP | OP units | Series of Individually Immaterial Asset Acquisitions                    
Class of Stock [Line Items]                    
Issuance of shares/units (in shares)           481,811        
Shares issued in connection with asset acquisition (in shares)           18,895        
NSA OP, LP | OP units | Retirement of Northwest                    
Class of Stock [Line Items]                    
Conversion of units, non-voluntary (in units)           2,545,063        
NSA OP, LP | LTIP units                    
Class of Stock [Line Items]                    
Issuance of shares/units (in shares)           185,528        
Unit conversion ratio           1        
Number of units converted (in units)           128,487        
NSA OP, LP | DownREIT Subordinated Performance Performance Units                    
Class of Stock [Line Items]                    
Number of units requested for conversion (in units)           203,637        
Personal Mini Affiliate | Subordinated performance units | Personal Mini                    
Class of Stock [Line Items]                    
Payments to acquire interest in subsidiaries and affiliates | $ $ 26,100                  
DownREIT Partnership | Subordinated performance units                    
Class of Stock [Line Items]                    
Unit conversion ratio           1        
Minimum conversion period (in years)           5 years        
DownREIT Partnership | OP units                    
Class of Stock [Line Items]                    
Issuance of shares/units (in shares)           195,573        
Unit conversion ratio           1        
Minimum conversion period (in years)           5 years        
At the Market Program                    
Class of Stock [Line Items]                    
Preferred stock, dividend rate, percentage         6.00%          
Value of common and preferred shares authorized under ATM program | $         $ 250,000         $ 400,000
Value of remaining available offered shares | $           $ 169,100       $ 31,000
Common Shares of Beneficial Interest, $0.01 par value per share | Follow-On Public Offering                    
Class of Stock [Line Items]                    
Sale of stock, number of shares issued in transaction (in shares)       10,120,000            
Sale of stock, price per share (USD per share) | $ / shares       $ 51.25            
Proceeds from sale of stock | $       $ 497,400            
Common Shares of Beneficial Interest, $0.01 par value per share | At the Market Program                    
Class of Stock [Line Items]                    
Sale of stock, number of shares issued in transaction (in shares)           0 0      
Underwriter option to purchase | Follow-On Public Offering                    
Class of Stock [Line Items]                    
Sale of stock, number of shares issued in transaction (in shares)       1,320,000            
Series A Cumulative Redeemable Preferred Shares of Beneficial Interest, par value $0.01 per share                    
Class of Stock [Line Items]                    
Preferred stock, dividend rate, percentage           6.00%        
Preferred shares per share amount of dividends (in dollars per share) | $ / shares           $ 1.50        
Series A Cumulative Redeemable Preferred Shares of Beneficial Interest, par value $0.01 per share | NSA OP, LP                    
Class of Stock [Line Items]                    
Preferred shares cash redemption price (in dollars per share) | $ / shares           $ 25.00