Annual report pursuant to Section 13 and 15(d)

SHAREHOLDERS' EQUITY AND NONCONTROLLING INTERESTS - Narrative (Details)

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SHAREHOLDERS' EQUITY AND NONCONTROLLING INTERESTS - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Jan. 01, 2023
Jul. 23, 2021
Feb. 27, 2019
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Jul. 11, 2022
May 19, 2021
Class of Stock [Line Items]                
Repurchase amount             $ 400,000  
Repurchase of common shares (in shares)       (1,986,175)        
Repurchase of common shares       $ (90,109)        
Preferred units stated value (in dollars per share)       $ 0.01 $ 0.01      
Common Shares                
Class of Stock [Line Items]                
Repurchase of common shares (in shares)       (1,986,175)        
Repurchase of common shares       $ (20)        
Redemptions/conversions of units (in shares)       627,896 700,326 892,070    
Issuance of shares/units (in shares)         19,196,216 2,622,892    
Additional Paid-in Capital                
Class of Stock [Line Items]                
Repurchase of common shares       $ (90,089)        
OP units                
Class of Stock [Line Items]                
Issuance of shares/units (in shares)       3,911,260        
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%        
NSA OP, LP | Series A-1 preferred units                
Class of Stock [Line Items]                
Preferred shares dividend rate (percent)       6.00%        
Preferred units stated value (in dollars per share)       $ 25.00        
Unit conversion ratio       1        
Minimum conversion period (in years)       10 years        
Redemptions/conversions of units (in shares)       280,869        
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)       353,030        
NSA OP, LP | OP units                
Class of Stock [Line Items]                
Unit conversion ratio       1        
Minimum conversion period (in years)       1 year        
Issuance of shares/units (in shares) 481,811              
NSA OP, LP | OP units | Series of Individually Immaterial Asset Acquisitions                
Class of Stock [Line Items]                
Shares issued in connection with asset acquisition (in shares)       887,291        
Redemptions/conversions of units (in shares)       235,241        
Issuance of shares/units (in shares)       235,241        
Number of units converted (in units)       800,556        
NSA OP, LP | OP units | Northwest's Right To Property Management Contracts, Brand, Intellectual Property, Certain Tangible Assets                
Class of Stock [Line Items]                
Number of units converted (in units)       800,556        
OP units issued (in units)       46,540        
NSA OP, LP | OP units | Retirement of Northwest                
Class of Stock [Line Items]                
Conversion of units, non-voluntary (in units)       3,911,260        
NSA OP, LP | OP units | Common Shares                
Class of Stock [Line Items]                
Redemptions/conversions of units (in shares)       627,896        
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)       2,078,357        
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)       82,611        
NSA OP, LP | Subordinated performance units | Northwest's Right To Property Management Contracts, Brand, Intellectual Property, Certain Tangible Assets                
Class of Stock [Line Items]                
Issuance of shares/units (in shares)       393,614        
NSA OP, LP | Subordinated performance units | Retirement of Northwest                
Class of Stock [Line Items]                
Issuance of shares/units (in shares)       167,396        
Conversion of units, non-voluntary (in units)       2,078,357        
NSA OP, LP | LTIP units                
Class of Stock [Line Items]                
Unit conversion ratio       1        
Issuance of shares/units (in shares)       145,739        
Number of units converted (in units)       192,296        
DownREIT Partnership | OP units                
Class of Stock [Line Items]                
Unit conversion ratio       1        
Minimum conversion period (in years)       5 years        
DownREIT Partnership | Subordinated performance units                
Class of Stock [Line Items]                
Unit conversion ratio       1        
Minimum conversion period (in years)       5 years        
At the Market Program                
Class of Stock [Line Items]                
Preferred shares dividend rate (percent)     6.00%          
Value of common and preferred shares authorized under ATM program     $ 250,000         $ 400,000
Value of remaining available offered shares               $ 31,000
Common Shares | 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)   $ 51.25            
Proceeds from sale of stock   $ 497,400            
Common Shares | At the Market Program                
Class of Stock [Line Items]                
Sale of stock, number of shares issued in transaction (in shares)       0 6,026,726      
Proceeds from sale of stock       $ 306,700        
Average price per share (in dollars per share)       $ 51.37        
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 preferred shares                
Class of Stock [Line Items]                
Preferred shares dividend rate (percent)       6.00%        
Preferred shares per share amount of dividends (in dollars per share)       $ 1.50        
Series A preferred shares | NSA OP, LP                
Class of Stock [Line Items]                
Preferred shares cash redemption price (in dollars per share)       $ 25.00