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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
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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)

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- Definition Equity Securities Without Readily Determinable Fair Value, Downward Price Adjustment, Cumulative Amounts + References No definition available. + Details
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- Definition Equity Securities Without Readily Determinable Fair Value, Upward Price Adjustment, Cumulative Amounts + References No definition available. + Details
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- Definition Securities And Other Investments Owned And Securities Sold Not Yet Purchased + References No definition available. + Details
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