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Compensation - Narrative (Detail)			3 Months Ended		9 Months Ended		12 Months Ended
	Jul. 01, 2023 USD ($) shares	Jun. 30, 2023 USD ($) shares	Sep. 30, 2024 USD ($) shares	Sep. 30, 2023 USD ($) shares	Sep. 30, 2024 USD ($) shares	Sep. 30, 2023 USD ($) shares	Dec. 31, 2023 USD ($) shares	Nov. 22, 2021 shares	Nov. 21, 2021 shares	Jul. 01, 2021 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate number of shares grant of future awards (in shares)			449,200,000		449,200,000
Issuance of restricted stock upon redemption of limited partnership interests (in shares)			0	38,610,233	0	38,610,233
Restricted stock awards granted upon conversion of limited partnership interests due to the Corporate Conversion | $				$ 0		$ 0
Number of share-equivalent limited partnership units exchangeable into shares (in shares)			0		0		0
Number of common stock settled per restricted stock unit (in shares)					1
Estimated fair value of restricted stock units | $					$ 5,000,000.0
Aggregate estimated fair value of limited partnership units and restricted stock units | $							$ 7,400,000
Aggregate estimated fair value of deferred compensation awards | $					$ 0		$ 600,000
Number of shares released the restrictions (in shares)			0	0	0	2,300,000
Shares withheld to satisfy tax liabilities (in shares)			900,000		3,600,000
LPUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock exchangeable basis					1
Limited partnership interests exchange ratio					0.9257
Issuance of common stock and grants of exchangeability | $			$ 37,928,000	$ 242,000	$ 101,703,000	$ 154,146,000
Outstanding (in shares)			0		0		0
LPUs | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares, restriction period (in years)					2 years
LPUs | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares, restriction period (in years)					5 years
LPUs | Newmark
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Limited partnership units outstanding (in shares)			6,429,000		6,429,000		8,779,000
Class A Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of share-equivalent limited partnership units exchangeable into shares (in shares)			200,000		200,000		200,000
Stock issued to employees (in shares)			1,200,000	0	5,800,000	0
Share-based payment arrangement, decrease for tax withholding obligation | $			$ 3,700,000		$ 24,900,000
Shares, forfeited (in shares)			299,935	0	972,567	238,927
Class A Common Stock | Newmark
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock redeemed during period (in shares)			1,600,000
Redemption of stock, shares issued			1,500,000
Compensation expense related to grants of exchangeability | $			$ 21,100,000		$ 21,100,000
Class A Common Stock | LPUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of common stock and grants of exchangeability | $			$ 37,928,000	$ 242,000	101,703,000	$ 154,146,000
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of restricted stock upon redemption of limited partnership interests (in shares)	25,300,000	22,500,000
Granted | $					$ 136,847,000
Share-based payment arrangement, decrease for tax withholding obligation | $	$ 74,000,000	$ 49,200,000
Limited partnership units outstanding (in shares)			71,091,000		71,091,000		64,942,000
Unrecognized compensation expense related to unvested | $			$ 217,900,000		$ 217,900,000
Unrecognized compensation expense related to unvested recognized period (in years)					4 years 10 months 9 days
Weighted- Average Remaining Contractual Term (Years)					4 years 10 months 9 days		5 years 11 months 15 days
Restricted Stock Units (RSUs) | Class A Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Value of shares withheld | $			7,000,000.0	2,700,000	$ 23,500,000	10,200,000
Non-exchangeable LPUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock redeemed during period (in shares)	54,000,000	16,900,000
Non-exchangeable FPUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock redeemed during period (in shares)		5,600,000
Restricted Stock Units, Tax Account
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock redeemed during period (in shares)	16,300,000
Restricted stock awards granted upon conversion of limited partnership interests due to the Corporate Conversion | $		$ 49,200,000
Granted | $	$ 74,000,000	$ 123,100,000
Unrecognized compensation expense related to unvested | $			73,400,000	111,700,000	73,400,000	111,700,000
Vested | $			6,300,000	10,600,000	$ 14,300,000	$ 10,600,000
Weighted- Average Remaining Contractual Term (Years)					8 years 1 month 28 days	8 years 6 months 3 days
Share-based payment arrangement, expense | $			$ 7,400,000	$ 13,100,000	$ 18,500,000	$ 13,100,000
Non-exchangeable PSU
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock redeemed during period (in shares)	9,900,000	10,600,000
Restricted Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of restricted stock upon redemption of limited partnership interests (in shares)	38,600,000
Granted | $					$ 0
Limited partnership units outstanding (in shares)			12,668,000		12,668,000		27,953,000
Unrecognized compensation expense related to unvested | $			$ 11,300,000		$ 11,300,000
Weighted- Average Remaining Contractual Term (Years)					6 months 21 days		2 years 6 months 18 days
Share-based payment arrangement, expense | $			$ 9,200,000		$ 53,500,000
Accelerated vesting of restricted stock (in shares)					4,500,000
Accelerated vesting expense | $					$ 27,700,000
Shares withheld to satisfy tax liabilities (in shares)			900,000		3,600,000
Restricted Shares | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares saleable period (in years)					5 years
Restricted Shares | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares saleable period (in years)					10 years
Restricted Shares | BGC or Newmark
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares, forfeited (in shares)			0	0	200,000	200,000
REUs | LPUs | Newmark
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Notional value with post-termination pay-out amount | $			$ 100,000		$ 100,000		$ 700,000
Aggregate estimated fair value of limited partnership units | $			$ 0		$ 0		$ 300,000
REUs | LPUs | BGC Holdings
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of outstanding limited partnership units, unvested (in shares)			0		0		100,000
Restricted BGC Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Limited partnership units outstanding (in shares)			0		0		100,000
Restricted BGC Stock | Newmark
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Limited partnership units outstanding (in shares)			0		0		0
Restricted Newmark Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares released the restrictions (in shares)			0	0	0	1,100,000
Restricted Stock, Dividend Eligible
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Limited partnership units outstanding (in shares)			23,400,000		23,400,000
Restricted Stock, Dividend Eligible
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Limited partnership units outstanding (in shares)			600,000		600,000
Equity plan | Class A Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized to be delivered pursuant to awards granted (in shares)								500,000,000.0	400,000,000.0	600,000,000.0

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