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Subsequent Events (Details) - USD ($)					1 Months Ended						3 Months Ended						9 Months Ended
	Oct. 22, 2025	Oct. 06, 2025	May 19, 2025	May 16, 2025	Sep. 30, 2025	Aug. 31, 2025	Jul. 31, 2025	Sep. 30, 2024	Aug. 31, 2024	Jul. 31, 2024	Sep. 30, 2025	Jun. 30, 2025	Mar. 31, 2025	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2025	Sep. 30, 2024	Nov. 05, 2025
Subsequent Event [Line Items]
Repurchase of class A common stock (in shares)					2,225,000	2,014,000	0	1,046,000	4,807,000	2,040,000	4,239,000	17,224,000	3,184,000	7,893,000	10,688,000	11,250,000	24,647,000	29,831,000
Payment to purchase equity securities																	$ 0	$ 3,699,000
BGC Group 6.150% Senior Notes due April 2, 2030
Subsequent Event [Line Items]
Stated interest rate					6.15%						6.15%						6.15%
Subsequent Event
Subsequent Event [Line Items]
Payment to purchase equity securities	$ 20,800,000
Subsequent Event | Purchaser Trusts | Mr. Howard W. Lutnick
Subsequent Event [Line Items]
Shares held by related party, value of shares sold		$ 200,000
Subsequent Event | Certain other Trusts Controlled by Mr. Brandon G. Lutnick | Mr. Howard W. Lutnick
Subsequent Event [Line Items]
Shares held by related party, value of shares sold		$ 13,096,795.7
Common Stock | Subsequent Event
Subsequent Event [Line Items]
Dividend declared per share (in dollars per share)																			$ 0.02
Class B Common Stock | Subsequent Event | Cantor | Mr. Howard W. Lutnick
Subsequent Event [Line Items]
Shares held by related party, number of shares sold (in shares)		8,973,721
Shares held by related party, shares sold, price per share (in dollars per share)		$ 9.2082
Shares issued, price per share, after tax (in dollars per share)		$ 0.032
Class A Common Stock
Subsequent Event [Line Items]
Repurchase of class A common stock (in shares)											4,236,069			7,013,116			22,808,205	26,264,523
Class A Common Stock | Mr. Howard W. Lutnick | Related Party
Subsequent Event [Line Items]
Repurchase of class A common stock (in shares)			16,115,102	16,452,850
Class A Common Stock | Subsequent Event | Mr. Howard W. Lutnick | Related Party
Subsequent Event [Line Items]
Repurchase of class A common stock (in shares)		337,765

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