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EQUITY AND MEZZANINE EQUITY - Additional Information (Details) |  |  | 3 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 01, 2021 USD ($) apartmentCommunity $ / shares shares | Feb. 26, 2019 USD ($) $ / shares | Mar. 31, 2022 USD ($) apartmentCommunity $ / shares shares | Mar. 31, 2021 USD ($) shares | Dec. 31, 2021 USD ($) $ / shares shares | Sep. 30, 2021 USD ($) | Dec. 31, 2019 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Noncontrolling interests , operating partnership, outstanding (in shares) |  |  | 997,000 |  | 832,000 |  |
Noncontrolling interests , operating partnership, issued (in shares) |  |  | 209,000 |  |  |  |
Preferred shares, shares issued (in shares) |  |  | 3,881,000 |  | 3,881,000 |  |
Preferred shares liquidation preference | $ |  |  | $ 97,036,000 |  | $ 97,036,000 |  |
Common stock outstanding (in shares) |  |  | 15,366,000 |  | 15,016,000 |  |
Sale / issuance of stock | $ |  |  | $ 31,684,000 | $ 11,782,000 |  |  |
Preferred shares of beneficial interest, shares outstanding (in shares) |  |  | 3,881,000 |  | 3,881,000 |  |
Preferred shares, liquidation preference (in dollars per share) | $ / shares |  |  | $ 25 |  | $ 25 |  |
Preferred units, shares issued (in shares) |  |  | 166,000 |  | 166,000 |  |
Preferred units, par value (in dollars per share) | $ / shares |  |  | $ 100 |  | $ 100 |  |
Preferred units, liquidation preference | $ |  |  | $ 16,560,000 |  | $ 16,560,000 |  |
2022 Acquisitions, Three Apartment Communities |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of properties acquired | apartmentCommunity |  |  | 3 |  |  |  |
2021 Acquisitions |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of properties acquired | apartmentCommunity | 17 |  |  |  |  |  |
Series E Preferred Units |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Preferred shares, shares issued (in shares) | 1,800,000 |  |  |  |  |  |
Preferred units, par value (in dollars per share) | $ / shares | $ 100 |  |  |  |  |  |
Preferred units, conversion ratio | 1.2048 |  |  |  |  |  |
Preferred shares liquidation preference | $ | $ 181,400,000 |  |  |  |  |  |
Preferred shares, dividend rate | 0.03875% |  |  |  |  |  |
Series C Preferred Shares |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Preferred shares liquidation preference | $ |  |  | $ 97,000,000 |  |  |  |
Preferred shares of beneficial interest, shares outstanding (in shares) |  |  | 3,900,000 |  | 3,900,000 |  |
Preferred shares, liquidation preference (in dollars per share) | $ / shares |  |  | $ 25.00 |  |  |  |
Preferred shares, annual distribution accrual rate (in dollars per share) | $ / shares |  |  | $ 1.65625 |  |  |  |
Preferred shares, dividend rate |  |  | 6.625% |  |  |  |
Series D Preferred Units |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Preferred units, shares issued (in shares) |  |  | 165,600 |  | 165,600 |  |
Preferred units, par value (in dollars per share) | $ / shares |  | $ 100 |  |  |  |  |
Distribution rate |  | 3.862% |  |  |  |  |
Units converted, ratio |  | 1.37931 |  |  |  |  |
Preferred units, liquidation preference | $ |  | $ 16,600,000 |  |  |  |  |
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 | $ 150,000,000
Aggregate gross sales price of common shares, remaining authorized amount | $ |  |  | $ 126,600,000 |  |  |  |
2015 Incentive Plan |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Equity awards issued (in shares) |  |  | 18,759 | 2,801 |  |  |
Sale / issuance of stock | $ |  |  | $ 1,500,000 | $ 164,000 |  |  |

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