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Investments - Equity Method Investments and Investments Carried Under Measurement Alternative (Detail) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
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Schedule of Equity Method Investments [Line Items] |  |
Equity method investments | $ 40,041 | $ 38,122
Investments carried under measurement alternative | 192 | 192
Total equity method and investments carried under measurement alternative | $ 40,233 | 38,314
Advanced Markets Holdings |  |
Schedule of Equity Method Investments [Line Items] |  |
Investment ownership percentage amount | 25.00% |
Equity method investments | $ 4,457 | 4,481
China Credit BGC Money Broking Company Limited |  |
Schedule of Equity Method Investments [Line Items] |  |
Investment ownership percentage amount | 33.00% |
Equity method investments | $ 23,825 | 21,277
Freedom International Brokerage |  |
Schedule of Equity Method Investments [Line Items] |  |
Investment ownership percentage amount | 45.00% |
Equity method investments | $ 9,659 | 9,507
Other |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity method investments | $ 2,100 | $ 2,857

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