BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Impairment of Long-Lived Assets (Details) |
3 Months Ended | 9 Months Ended | 12 Months Ended | ||
|---|---|---|---|---|---|
|
Sep. 30, 2026
USD ($)
|
Sep. 30, 2025
USD ($)
apartmentCommunity
|
Sep. 30, 2026
USD ($)
apartmentCommunity
|
Sep. 30, 2025
USD ($)
apartmentCommunity
|
Dec. 31, 2025
apartmentCommunity
|
|
| Accounting Policies [Abstract] | |||||
| Impairment of real estate investments | $ | $ 0 | $ 8,676,000 | $ 9,700,000 | $ 23,219,000 | |
| Number of apartment communities impaired during period | apartmentCommunity | 6 | 1 | 6 | 1 | |