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Investments - Equity Method Investments and Investments Carried Under Measurement Alternative (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]
Equity method investments	$ 32,847	$ 37,659
Investments carried under measurement alternative	192	349
Total equity method and investments carried under measurement alternative	$ 33,039	$ 38,008
Advanced Markets Holdings
Schedule of Equity Method Investments [Line Items]
Investment ownership percentage amount	25.00%	43.00%
Equity method investments	$ 5,110	$ 8,867
China Credit BGC Money Broking Company Limited
Schedule of Equity Method Investments [Line Items]
Investment ownership percentage amount	33.00%
Equity method investments	$ 16,784	15,119
Freedom International Brokerage
Schedule of Equity Method Investments [Line Items]
Investment ownership percentage amount	45.00%
Equity method investments	$ 9,794	9,800
Other
Schedule of Equity Method Investments [Line Items]
Equity method investments	$ 1,159	$ 3,873

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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