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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
	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

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- Definition

Equity Securities Without Readily Determinable Fair Value, Upward Price Adjustment, Cumulative Amounts

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- Definition

Securities And Other Investments Owned And Securities Sold Not Yet Purchased

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