Organization and Basis of Presentation - Additional Information (Detail) - USD ($)					1 Months Ended	6 Months Ended	12 Months Ended
	Jul. 02, 2023	Jul. 01, 2023	Jun. 30, 2023	Jul. 30, 2021	Oct. 31, 2023	Dec. 31, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Description Of Business [Line Items]
Share-based payment arrangement, decrease for tax withholding obligation					$ 5,000,000
Share-based payment arrangement, total shares (in shares)						0
Conversion of stock, shares converted (in shares)		64,000,000
Minimum number of shares required to be issued (in shares)		75,000,000
Stock Purchased On 6/30/2023
Description Of Business [Line Items]
Conversion of stock, shares converted (in shares)		5,700,000
Related Party
Description Of Business [Line Items]
Issuance of Class A common stock (net of costs) (in shares)							0	0
Non-exchangeable Limited Partnership Interests
Description Of Business [Line Items]
Equity-based compensation expense						$ 60,900,000
Exchangeable Limited Partnership Units | Related Party
Description Of Business [Line Items]
Shares redeemed in period (in shares)						1,500,000
Restricted Stock Units (RSUs)
Description Of Business [Line Items]
Shares granted in period (in shares)		25,300,000
Exchange ratio			1
Share-based payment arrangement, decrease for tax withholding obligation		$ 74,000,000	$ 49,200,000
Restricted Stock Units (RSUs) | Related Party
Description Of Business [Line Items]
Shares granted in period (in shares)						16,900,000
Cantor Units | Related Party
Description Of Business [Line Items]
Shares redeemed in period (in shares)						324,223
Cantor Units | Related Party | Cantor
Description Of Business [Line Items]
Shares redeemed in period (in shares)						5,425,209
Aggregate consideration						$ 9,715,772
FPU | Related Party
Description Of Business [Line Items]
Shares redeemed in period (in shares)						5,425,209
Exchange of units (in shares)						324,223
FPU & Cantor Units | Related Party
Description Of Business [Line Items]
Aggregate consideration						$ 598,712
Restricted Shares
Description Of Business [Line Items]
Equity-based compensation expense							$ 24,700,000
Restricted Shares | Maximum
Description Of Business [Line Items]
Shares granted in period (in shares)		38,600,000
Non-exchangeable FPUs | Related Party
Description Of Business [Line Items]
Shares redeemed in period (in shares)						5,600,000
Class A Common Stock
Description Of Business [Line Items]
Common stock, par value (in dollars per share)						$ 0.01	$ 0.01	$ 0.01
Shares granted in period (in shares)		600,000,000
Issuance of Class A common stock (net of costs) (in shares)							518,191	500,697	417,247
Common stock, shares authorized (in shares)		1,500,000,000				1,500,000,000	1,500,000,000	750,000,000
Class A Common Stock | Share-Based Payment Arrangement | Related Party
Description Of Business [Line Items]
Shares granted in period (in shares)						1,000,000
Class A Common Stock | BGC Parnters
Description Of Business [Line Items]
Common stock, par value (in dollars per share)		$ 0.01
Class A Common Stock | BGC Group
Description Of Business [Line Items]
Common stock, par value (in dollars per share)		$ 0.01
Class B Common Stock
Description Of Business [Line Items]
Common stock, par value (in dollars per share)						$ 0.01	$ 0.01	$ 0.01
Issuance of Class A common stock (net of costs) (in shares)	15,800,000	64,000,000					64,000,000	0
Common stock, shares authorized (in shares)		300,000,000				300,000,000	300,000,000	150,000,000
Class B Common Stock | BGC Parnters
Description Of Business [Line Items]
Common stock, par value (in dollars per share)		$ 0.01
Class B Common Stock | BGC Group
Description Of Business [Line Items]
Common stock, par value (in dollars per share)		$ 0.01
Futures Exchange Group
Description Of Business [Line Items]
Payments to acquire businesses				$ 4,900,000