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Notes Payable, Other and Short-Term Borrowings - Carrying Amounts and Estimated Fair Values of Company's Senior Notes (Detail) - USD ($) $ in Thousands	Sep. 30, 2023	May 25, 2023	Dec. 31, 2022	Jul. 10, 2020	Sep. 27, 2019	Jul. 24, 2018
Debt Instrument [Line Items]
Carrying Amount	$ 944,565		$ 1,045,966
Fair Value	$ 905,892		1,017,015
BGC Partners 5.375% Senior Notes due July 24, 2023
Debt Instrument [Line Items]
Stated interest rate	5.375%					5.375%
Carrying Amount	$ 0		449,243
Fair Value	$ 0		449,007
BGC Partners 3.750% Senior Notes due October 1, 2024
Debt Instrument [Line Items]
Stated interest rate	3.75%				3.75%
Carrying Amount	$ 299,180		298,558
Fair Value	$ 288,468		286,894
BGC Partners 4.375% Senior Notes due December 15, 2025
Debt Instrument [Line Items]
Stated interest rate	4.375%			4.375%	4.375%
Carrying Amount	$ 298,630		298,165
Fair Value	$ 278,625		281,114
BGC Partners 8.000% Senior Notes due May 25, 2028
Debt Instrument [Line Items]
Stated interest rate	8.00%	8.00%
Carrying Amount	$ 346,755		0
Fair Value	$ 338,799		$ 0

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