SECURITIES AND OTHER INVESTMENTS OWNED AND SECURITIES SOLD NOT YET PURCHASED - Schedule of equity securities without readily determinable fair value (Details) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | 82 Months Ended | ||
|---|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
|
| Securities And Other Investments Owned And Securities Sold Not Yet Purchased [Abstract] | |||||
| Upward carrying value changes | $ 1,415 | $ 0 | $ 1,415 | $ 1,732 | $ 12,533 |
| Downward carrying value changes/impairment | $ (1,400) | $ 0 | $ (2,268) | $ (592) | $ (13,553) |