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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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