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Investments - Equity Method Investments and Investments Carried Under Measurement Alternative (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Schedule of Equity Method Investments [Line Items]
Equity method investments	$ 35,433	$ 39,075
Investments carried under measurement alternative	3,530	192
Total equity method and investments carried under measurement alternative	$ 38,963	39,267
Advanced Markets Holdings
Schedule of Equity Method Investments [Line Items]
Investment ownership percentage amount (as a percent)	25.00%
Equity method investments	$ 3,405	3,772
China Credit BGC Money Broking Company Limited
Schedule of Equity Method Investments [Line Items]
Investment ownership percentage amount (as a percent)	33.00%
Equity method investments	$ 21,734	23,242
Freedom International Brokerage
Schedule of Equity Method Investments [Line Items]
Investment ownership percentage amount (as a percent)	45.00%
Equity method investments	$ 9,150	9,637
Other
Schedule of Equity Method Investments [Line Items]
Equity method investments	$ 1,144	$ 2,424

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