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Investments - Equity Method Investments and Investments Carried Under Measurement Alternative (Detail) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Schedule of Equity Method Investments [Line Items]    
Equity method investments $ 43,016 $ 38,122
Investments carried under measurement alternative 192 192
Total equity method and investments carried under measurement alternative $ 43,208 38,314
Advanced Markets Holdings    
Schedule of Equity Method Investments [Line Items]    
Investment ownership percentage amount (as a percent) 25.00%  
Equity method investments $ 4,083 4,481
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 $ 27,773 21,277
Freedom International Brokerage    
Schedule of Equity Method Investments [Line Items]    
Investment ownership percentage amount (as a percent) 45.00%  
Equity method investments $ 9,140 9,507
Other    
Schedule of Equity Method Investments [Line Items]    
Equity method investments $ 2,020 $ 2,857