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Investments - Equity Method Investments and Investments Carried Under Measurement Alternative (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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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

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