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EQUITY AND MEZZANINE EQUITY - Additional Information (Details)
 3 Months Ended 9 Months Ended 20 Months Ended
Sep. 01, 2021
USD ($)
apartmentUnit
$ / shares
shares
Feb. 26, 2019
USD ($)
$ / shares
shares
Sep. 30, 2021
USD ($)
$ / shares
shares
Sep. 30, 2020
USD ($)
shares
Sep. 30, 2021
USD ($)
$ / shares
shares
Sep. 30, 2020
USD ($)
shares
Dec. 31, 2019
USD ($)
Dec. 31, 2020
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Noncontrolling interests - operating partnership (in shares) | shares     845,000   845,000     977,000
Preferred shares liquidation preference     $ 97,000,000   $ 97,000,000      
Common stock outstanding (in shares) | shares     14,281,000   14,281,000     13,027,000
Sale / issuance of stock     $ 19,508,000 $ 10,063,000 $ 85,864,000 $ 58,204,000    
Preferred shares, annual distribution accrual rate (in dollars per share) | $ / shares         $ 1.65625      
Preferred shares, dividend rate         6.625%      
2021 Acquisitions                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of properties | apartmentUnit 17              
Series E Preferred Units                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Preferred units, shares issued (in shares) | shares 1,800,000              
Preferred units, par value (in dollars per share) | $ / shares $ 100              
Preferred units, conversion ratio 1.2048              
Preferred units, conversion exchange rate (in dollars per share) | $ / shares $ 83.00              
Preferred shares liquidation preference $ 181,400,000              
Sale / issuance of stock     $ 217,513,000   $ 217,513,000      
Preferred shares, dividend rate 0.03875%              
Series C Preferred Shares                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Preferred units, shares issued (in shares) | shares     3,881,000   3,881,000     3,881,000
Preferred shares liquidation preference     $ 97,036,000   $ 97,036,000     $ 97,036,000
Preferred shares of beneficial interest, shares outstanding (in shares) | shares     3,881,000   3,881,000     3,881,000
Preferred shares, liquidation preference (in dollars per share) | $ / shares     $ 25   $ 25     $ 25.00
Series D Preferred Units                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Preferred units, shares issued (in shares) | shares   165,600 166,000   166,000     166,000
Preferred units, par value (in dollars per share) | $ / shares   $ 100 $ 100   $ 100     $ 100
Distribution rate   3.862%            
Units converted, ratio   1.37931            
Conversion price (in dollars per share) | $ / shares   $ 72.50            
Preferred units, liquidation preference   $ 16,600,000 $ 16,560,000   $ 16,560,000     $ 16,560,000
At-The-Market Offering                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Aggregate gross sales price of common shares, authorized amount     250,000,000   250,000,000   $ 150,000,000  
Total consideration     19,632,000 $ 10,218,000 86,127,000 $ 57,528,000 $ 149,900,000  
Aggregate gross sales price of common shares, remaining authorized amount     $ 230,100,000   $ 230,100,000      
2015 Incentive Plan                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Equity awards issued (in shares) | shares     578 297 26,764 20,998    
Sale / issuance of stock     $ 32,000 $ 17,000 $ 946,000 $ 1,000,000