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Subsequent Events (Detail) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		9 Months Ended
	Oct. 27, 2023	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Oct. 06, 2023	Oct. 04, 2023	May 25, 2023	Dec. 31, 2022	Jul. 10, 2020	Sep. 27, 2019
Subsequent Event [Line Items]
Dividends declared per share of common stock (in dollars per share)		$ 0.01	$ 0.01	$ 0.03	$ 0.03
Carrying Amount		$ 944,565		$ 944,565					$ 1,045,966
Subsequent event
Subsequent Event [Line Items]
Dividends declared per share of common stock (in dollars per share)	$ 0.01
BGC Partners 3.750% Senior Notes due October 1, 2024
Subsequent Event [Line Items]
Stated interest rate		3.75%		3.75%							3.75%
Carrying Amount		$ 299,180		$ 299,180					298,558
BGC Partners 3.750% Senior Notes due October 1, 2024 | Senior Notes
Subsequent Event [Line Items]
Stated interest rate											3.75%
BGC Partners 3.750% Senior Notes due October 1, 2024 | Subsequent event
Subsequent Event [Line Items]
Carrying Amount							$ 44,500
BGC Partners 3.750% Senior Notes due October 1, 2024 | Subsequent event | Senior Notes
Subsequent Event [Line Items]
Carrying Amount						$ 255,500
BGC Partners 8.000% Senior Notes due May 25, 2028
Subsequent Event [Line Items]
Stated interest rate		8.00%		8.00%				8.00%
Carrying Amount		$ 346,755		$ 346,755					0
BGC Partners 8.000% Senior Notes due May 25, 2028 | Subsequent event
Subsequent Event [Line Items]
Carrying Amount							2,800
BGC Partners 8.000% Senior Notes due May 25, 2028 | Subsequent event | Senior Notes
Subsequent Event [Line Items]
Carrying Amount						347,200
BGC Partners 4.375% Senior Notes due December 15, 2025
Subsequent Event [Line Items]
Stated interest rate		4.375%		4.375%						4.375%	4.375%
Carrying Amount		$ 298,630		$ 298,630					$ 298,165
BGC Partners 4.375% Senior Notes due December 15, 2025 | Senior Notes
Subsequent Event [Line Items]
Stated interest rate										4.375%
BGC Partners 4.375% Senior Notes due December 15, 2025 | Subsequent event
Subsequent Event [Line Items]
Carrying Amount							$ 11,800
BGC Partners 4.375% Senior Notes due December 15, 2025 | Subsequent event | Senior Notes
Subsequent Event [Line Items]
Carrying Amount						$ 288,200

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