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INVESTMENT IN UNCONSOLIDATED JOINT VENTURES - Additional Information (Details) | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Apr. 30, 2012 | Mar. 31, 2019 USD ($) property | Mar. 31, 2018 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) | Mar. 22, 2013
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Investments in unconsolidated joint ventures | [1] |  | $ 93,841,000 |  |  | $ 40,354,000 |
Distributions from operations of investment in unconsolidated joint ventures |  |  | 3,067,000 | $ 0 |  |  |
Expenses from investment |  |  | (3,863,000) | (3,572,000) |  |  |
Grace Lake JV, LLC |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Investments in unconsolidated joint ventures |  |  | $ 2,664,000 |  |  | 5,316,000 |
Percentage of equity kicker received with right to convert upon capital event |  | 25.00% |  |  |  |  |
Preferred return used to determine distribution of excess cash flow (as a percent) |  |  | 8.25% |  |  |  |
Percentage of distribution of all excess cash flows and all disposition proceeds upon any sale entitled after consideration of preferred return and return of equity remaining in the property to operating partner |  |  | 25.00% |  |  |  |
Percentage of investment of operating partner |  |  | 81.00% |  |  |  |
Distributions from operations of investment in unconsolidated joint ventures |  |  | $ 3,100,000 | $ 1,300,000 |  |  |
Grace Lake JV, LLC | LP Units |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Ownership interest (as a percent) |  |  |  |  |  |  | 19.00%
Grace Lake JV, LLC | Limited liability company |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Ownership interest (as a percent) |  |  | 19.00% |  |  |  |
24 Second Avenue Holdings LLC |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Investments in unconsolidated joint ventures |  |  | $ 91,177,000 |  |  | 35,038,000 |
Expenses from investment |  |  | 500,000 |  |  | (200,000) |
Interest costs capitalized |  |  | 100,000 |  | $ 300,000 |  |
24 Second Avenue Holdings LLC | Mezzanine Loan |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Committed amount on credit agreement |  |  | 6,500,000 |  |  |  |
24 Second Avenue Holdings LLC | Co-venturer |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Loans payable outstanding from unconsolidated joint venture |  |  |  |  |  | $ 46,700,000 |
24 Second Avenue Holdings LLC | Co-venturer | Construction Loan |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Common equity interest |  |  | 35,000,000 |  |  |  |
Preferred equity position |  |  | 35,000,000 |  |  |  |
Loan refinance |  |  | 50,400,000 |  |  |  |
Committed amount on credit agreement |  |  | 48,059,266 |  |  |  |
Remaining capital commitment to operating partner |  |  | $ 0 |  |  |  |
Apartment Building | 24 Second Avenue Holdings LLC |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Number of real estate properties | property |  |  | 30 |  |  |  |
Number of real estate properties, under contract | property |  |  | 15 |  |  |  |
Real estate properties, under contract |  |  | $ 43,300,000 |  |  |  |
Other | 24 Second Avenue Holdings LLC |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Number of real estate properties | property |  |  | 1 |  |  |  |
Real Estate Property Sold | Apartment Building | 24 Second Avenue Holdings LLC |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Number of real estate properties, under contract | property |  |  | 1 |  |  |  |
Real estate properties, under contract |  |  | $ 1,000,000 |  |  |  |
Real Estate Property Sold Two | Apartment Building | 24 Second Avenue Holdings LLC |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Number of real estate properties, under contract | property |  |  | 3 |  |  |  |
Real estate properties, under contract |  |  | $ 6,200,000 |  |  |  |
Minimum | Apartment Building | 24 Second Avenue Holdings LLC |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Real estate properties, under contract, deposit (as a percentage) |  |  | 10.00% |  |  |  |
Maximum | Apartment Building | 24 Second Avenue Holdings LLC |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Real estate properties, under contract, deposit (as a percentage) |  |  | 15.00% |  |  |  |
[1] | Includes amounts relating to consolidated variable interest entities. See Note 3.

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