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Subsequent Events (Detail) - USD ($) $ / shares in Units, $ in Millions			3 Months Ended		9 Months Ended
	Oct. 28, 2024	Oct. 01, 2024	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Oct. 30, 2024	Jun. 07, 2024	Mar. 08, 2024	Oct. 06, 2023	Sep. 27, 2019	Aug. 06, 2018	Mar. 19, 2018
Subsequent Event [Line Items]
Dividends declared per share of common stock (in dollars per share)			$ 0.02	$ 0.01	$ 0.05	$ 0.03
Revolving credit facility | BGC Credit Agreement | Related Party
Subsequent Event [Line Items]
Principal amount of debt component								$ 400.0	$ 400.0			$ 400.0	$ 250.0
BGC Group 3.750% Senior Notes due October 1, 2024
Subsequent Event [Line Items]
Stated interest rate			3.75%		3.75%					3.75%
BGC Partners 3.750% Senior Notes due October 1, 2024
Subsequent Event [Line Items]
Stated interest rate			3.75%		3.75%						3.75%
Subsequent event
Subsequent Event [Line Items]
Dividends declared per share of common stock (in dollars per share)	$ 0.02
Stock repurchase program, authorized amount							$ 400.0
Subsequent event | Senior Revolving Credit Agreement
Subsequent Event [Line Items]
Proceeds from credit facility		$ 200.0
Subsequent event | Revolving credit facility | BGC Credit Agreement | Related Party
Subsequent Event [Line Items]
Repayment of outstanding borrowings		150.0
Subsequent event | BGC Group 3.750% Senior Notes due October 1, 2024
Subsequent Event [Line Items]
Principal amount of debt component		$ 255.5
Stated interest rate		3.75%
Subsequent event | BGC Partners 3.750% Senior Notes due October 1, 2024
Subsequent Event [Line Items]
Principal amount of debt component		$ 44.5
Stated interest rate		3.75%

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Amount authorized for purchase of share under share repurchase plan. Includes, but is not limited to, repurchase of stock and unit of ownership.

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Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

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