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Investments - Equity Method Investments and Investments Carried Under Measurement Alternative (Detail) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Schedule of Equity Method Investments [Line Items]
Equity method investments	$ 38,383	$ 32,847
Investments carried under measurement alternative	192	192
Total equity method and investments carried under measurement alternative	$ 38,575	33,039
Advanced Markets Holdings
Schedule of Equity Method Investments [Line Items]
Investment ownership percentage amount	25.00%
Equity method investments	$ 5,090	5,110
China Credit BGC Money Broking Company Limited
Schedule of Equity Method Investments [Line Items]
Investment ownership percentage amount	33.00%
Equity method investments	$ 21,104	16,784
Freedom International Brokerage
Schedule of Equity Method Investments [Line Items]
Investment ownership percentage amount	45.00%
Equity method investments	$ 9,659	9,794
Other
Schedule of Equity Method Investments [Line Items]
Equity method investments	$ 2,530	$ 1,159

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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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Sum of the carrying amounts as of the balance sheet date of all investments.

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