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SECURITIES AND OTHER INVESTMENTS OWNED AND SECURITIES SOLD NOT YET PURCHASED - Additional information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Dec. 31, 2025
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items]
Equity securities, FV-NI, unrealized gain (loss)	$ 2,404	$ 2,855	$ 98,394	$ (13,127)
Other Equity Investments
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items]
Equity method investments, fair value	$ 19,903		$ 19,903		$ 19,835
B&W
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items]
Rate of equity interests	19.00%		19.00%		25.00%
Equity method investments, fair value	$ 386,996		$ 386,996		$ 174,011

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Fair value portion of investments accounted under the equity method.

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Amount of unrealized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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