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Investments - Equity Method Investments and Investments Carried Under Measurement Alternative (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Schedule Of Equity Method Investments [Line Items]    
Equity method investments $ 40,000 $ 35,211
Investments carried under measurement alternative 349 192
Total equity method and investments carried under measurement alternative $ 40,349 35,403
Advanced Markets Holdings [Member]    
Schedule Of Equity Method Investments [Line Items]    
Investment ownership percentage amount 43.00%  
Equity method investments $ 10,259 10,910
Freedom International Brokerage [Member]    
Schedule Of Equity Method Investments [Line Items]    
Investment ownership percentage amount 45.00%  
Equity method investments $ 10,142 9,959
China Credit BGC Money Broking Company Limited [Member]    
Schedule Of Equity Method Investments [Line Items]    
Investment ownership percentage amount 33.00%  
Equity method investments $ 12,214 10,435
Other Investees [Member]    
Schedule Of Equity Method Investments [Line Items]    
Equity method investments $ 7,385 $ 3,907