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Notes Payable and Other Borrowings - Summary Notes Payable, Other and Short-term Borrowings (Detail) - USD ($) $ in Thousands	Jun. 30, 2024	Jun. 10, 2024	Dec. 31, 2023	Oct. 06, 2023	May 25, 2023	Jul. 10, 2020	Sep. 27, 2019
Debt Instrument [Line Items]
Total Notes payable and other borrowings	$ 1,440,689		$ 1,183,506
Senior Revolving Credit Facility \| Unsecured Debt
Debt Instrument [Line Items]
Unsecured senior revolving credit agreement	0		239,180
BGC Group $3.750% Senior Notes due October 1, 2024
Debt Instrument [Line Items]
Senior notes	$ 255,306		254,814
Stated interest rate	3.75%			3.75%
BGC Partners $3.750% Senior Notes due October 1, 2024
Debt Instrument [Line Items]
Senior notes	$ 44,444		44,383
Stated interest rate	3.75%						3.75%
BGC Group $4.375% Senior Notes due December 15, 2025
Debt Instrument [Line Items]
Senior notes	$ 287,096		286,729
Stated interest rate	4.375%			4.375%
BGC Partners $4.375% Senior Notes due December 15, 2025
Debt Instrument [Line Items]
Senior notes	$ 11,812		11,800
Stated interest rate	4.375%					4.375%	4.375%
BGC Group $8.000% Senior Notes due May 25, 2028
Debt Instrument [Line Items]
Senior notes	$ 344,236		343,852
Stated interest rate	8.00%			8.00%
BGC Partners $8.000% Senior Notes due May 25, 2028
Debt Instrument [Line Items]
Senior notes	$ 2,751		2,748
Stated interest rate	8.00%				8.00%
BGC Group 6.600% Senior Notes due June 10, 2029
Debt Instrument [Line Items]
Senior notes	$ 495,044		$ 0
Total Notes payable and other borrowings		$ 495,000
Stated interest rate		6.60%