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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 |  |

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