SHAREHOLDERS' EQUITY AND NONCONTROLLING INTERESTS - Schedule of Units Reflecting Noncontrolling Interests (Details) - shares |
Mar. 31, 2026 |
Dec. 31, 2025 |
|---|---|---|
| Partnership Subsidiaries | ||
| Noncontrolling Interest [Line Items] | ||
| Outstanding equity interest (in shares) | 58,873,833 | 59,134,350 |
| Series A-1 preferred units | NSA OP, LP | ||
| Noncontrolling Interest [Line Items] | ||
| Outstanding equity interest (in shares) | 1,096,711 | 1,193,211 |
| OP units | NSA OP, LP | ||
| Noncontrolling Interest [Line Items] | ||
| Outstanding equity interest (in shares) | 51,074,863 | 51,321,262 |
| OP units | DownREIT Partnership | ||
| Noncontrolling Interest [Line Items] | ||
| Outstanding equity interest (in shares) | 5,769,214 | 5,769,214 |
| LTIP units | NSA OP, LP | ||
| Noncontrolling Interest [Line Items] | ||
| Outstanding equity interest (in shares) | 933,045 | 850,663 |