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Compensation - Narrative (Detail) $ / shares in Units, $ in Thousands				3 Months Ended			9 Months Ended		12 Months Ended
	Feb. 05, 2025 $ / shares shares	Jul. 01, 2023 USD ($) shares	Jun. 30, 2023 USD ($)	Sep. 30, 2025 USD ($) shares	Mar. 31, 2025 USD ($)	Sep. 30, 2024 USD ($) shares	Sep. 30, 2025 USD ($) shares	Sep. 30, 2024 USD ($) shares	Dec. 31, 2024 USD ($) shares	Nov. 22, 2021 shares	Nov. 21, 2021 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate number of shares grant of future awards (in shares)				416,100,000			416,100,000
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
Accelerated vesting of restricted stock (in shares)	1,300,000
Shares withheld to satisfy tax liabilities (in shares)						900,000	1,800,000	3,600,000
Tax withholding (in dollars per share) | $ / shares	$ 9.38
Accelerated vesting expense | $							$ 11,000
Estimated fair value of restricted stock units | $					$ 14,700		$ 15,100
Number of shares released the restrictions (in shares)				0		0	0	0
Number of restricted stock award settled per common stock (in shares)				1			1
Restricted Stock, Dividend Eligible
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Limited partnership units outstanding (in shares)				21,500,000			21,500,000		22,900,000
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Limited partnership units outstanding (in shares)				74,524,000			74,524,000		72,498,000
Unrecognized compensation expense related to unvested | $				$ 255,900		$ 217,900	$ 255,900	$ 217,900
Unrecognized compensation expense related to unvested recognized period (in years)							4 years 2 months 26 days	4 years 10 months 9 days
Granted | $							$ 140,692
Weighted-average remaining contractual term (years)							4 years 2 months 26 days		4 years 6 months 29 days
Granted (in shares)							15,552,000
Restricted Stock Units, Tax Account
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense related to unvested | $				58,200		73,400	$ 58,200	$ 73,400
Granted | $		$ 74,000	$ 49,200
Vested | $				1,800		6,300	$ 9,900	$ 14,300
Weighted-average remaining contractual term (years)							7 years 3 months 18 days	8 years 1 month 28 days
Share-based payment arrangement, expense | $				$ 2,500		7,400	$ 11,300	$ 18,500
Restricted Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Limited partnership units outstanding (in shares)				334,000			334,000		7,304,000
Unrecognized compensation expense related to unvested | $				$ 600			$ 600
Granted | $							$ 0
Weighted-average remaining contractual term (years)							7 years 9 months		7 months 2 days
Share-based payment arrangement, expense | $				$ 200		$ 9,200	$ 5,300	$ 53,500
Accelerated vesting of restricted stock (in shares)								4,500,000
Shares withheld to satisfy tax liabilities (in shares)				0			1,800,000
Accelerated vesting expense | $								$ 27,700
Granted (in shares)		38,600,000					0
Restricted Shares | BGC or Newmark
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares, forfeited (in shares)				0		0	0	200,000
Restricted BGC Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Limited partnership units outstanding (in shares)				0			0		0
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	0
Restricted Stock, Dividend Eligible
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Limited partnership units outstanding (in shares)				300,000			300,000
Minimum | Restricted Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares saleable period (in years)							5 years
Maximum | Restricted Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares saleable period (in years)							10 years
LPUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Limited partnership interests exchange ratio							0.9258
LPUs | Newmark
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Limited partnership units outstanding (in shares)				2,238,000			2,238,000		2,936,000
Granted (in shares)							0
LPUs | REUs | BGC Holdings
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding (in shares)				100,000			100,000		100,000
LPUs | REUs | Newmark
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Notional value with post-termination pay-out amount | $				$ 500			$ 500		$ 500
Aggregate estimated fair value of limited partnership units | $				$ 200			$ 200		$ 200
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
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)				100,000			100,000		300,000
Stock issued to employees (in shares)				2,500,000		1,200,000	6,800,000	5,800,000
Share-based payment arrangement, decrease for tax withholding obligation | $				$ 10,100		$ 3,700	$ 31,000	$ 24,900
Accelerated vesting of restricted stock (in shares)	600,000
Conversion right (in shares)	1
Shares withheld to satisfy tax liabilities (in shares)	700,000
Shares, forfeited (in shares)				0		299,935	372,504	972,567
Class A Common Stock | Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Value of shares withheld | $				$ 4,300		$ 7,000	$ 31,800	$ 23,500
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)		600,000,000.0								500,000,000.0	400,000,000.0

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