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Notes Payable and Other Borrowings - Schedule of Notes Payable, Other and Short-term Borrowings (Detail) - USD ($) $ in Thousands	Jun. 30, 2025	Apr. 02, 2025	Dec. 31, 2024	Aug. 21, 2024	Jun. 10, 2024	Oct. 19, 2023	Oct. 06, 2023	May 25, 2023	Sep. 27, 2019
Debt Instrument [Line Items]
Total Notes payable and other borrowings	$ 1,917,835		$ 1,337,540
Deferred financing cost	16,700		12,000
Senior Revolving Credit Facility \| Unsecured Debt
Debt Instrument [Line Items]
Unsecured senior revolving credit agreement	$ 81,745		195,831
BGC Group 4.375% Senior Notes due December 15, 2025
Debt Instrument [Line Items]
Stated interest rate	4.375%					4.375%	4.375%
Senior notes	$ 287,829		287,462
BGC Partners 4.375% Senior Notes due December 15, 2025
Debt Instrument [Line Items]
Stated interest rate	4.375%								4.375%
Senior notes	$ 11,836		11,824
BGC Group 8.000% Senior Notes due May 25, 2028
Debt Instrument [Line Items]
Stated interest rate	8.00%					8.00%	8.00%
Senior notes	$ 345,003		344,620
BGC Partners 8.000% Senior Notes due May 25, 2028
Debt Instrument [Line Items]
Stated interest rate				8.00%				8.00%
Senior notes	$ 2,260		2,257
Total Notes payable and other borrowings								$ 346,600
BGC Group 6.600% Senior Notes due June 10, 2029
Debt Instrument [Line Items]
Stated interest rate	6.60%				6.60%
Senior notes	$ 496,046		495,546
BGC Group 6.150% Senior Notes due April 2, 2030
Debt Instrument [Line Items]
Senior notes	$ 693,116		$ 0
Total Notes payable and other borrowings		$ 692,800