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Related Party Transactions - Service Agreements (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Related Party Transaction [Line Items]
Total revenues	$ 561,111	$ 482,694	$ 1,690,486	$ 1,508,641
Tower Bridge International Services LP | BGC Partners, Inc.
Related Party Transaction [Line Items]
Company ownership of Tower Bridge (as a percent)			52.00%
Tower Bridge International Services LP | Cantor
Related Party Transaction [Line Items]
Ownership percentage by noncontrolling owners (as a percent)	48.00%		48.00%
Related Party
Related Party Transaction [Line Items]
Mark-up cost of services (as a percent)			7.50%
Share of net profit (loss) from noncontrolling interest	$ 500	1,200	$ 1,200	1,800
Compensation to leased employees	18,700	16,300	55,700	48,000
Related Party | Service Agreement with Cantor
Related Party Transaction [Line Items]
Total revenues	5,100	3,700	14,200	11,700
Service charges	$ 26,900	$ 23,300	$ 79,200	$ 71,400

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