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Compensation - Narrative (Detail) $ / shares in Units, $ in Thousands				3 Months Ended		6 Months Ended		12 Months Ended
	Feb. 05, 2025 $ / shares shares	Jul. 01, 2023 USD ($) shares	Jun. 30, 2023 USD ($)	Jun. 30, 2025 USD ($) shares	Jun. 30, 2024 USD ($) shares	Jun. 30, 2025 USD ($) shares	Jun. 30, 2024 USD ($) 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)				423,100,000		423,100,000
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)				1,100,000	1,300,000	1,800,000	2,700,000
Tax withholding (in dollars per share) | $ / shares	$ 9.38
Accelerated vesting expense | $						$ 11,000
Estimated fair value of restricted stock units | $						$ 15,900		$ 14,700
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)				21,800,000		21,800,000		22,900,000
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Limited partnership units outstanding (in shares)				72,816,000		72,816,000		72,498,000
Unrecognized compensation expense related to unvested | $				$ 254,000	$ 209,600	$ 254,000	$ 209,600
Unrecognized compensation expense related to unvested recognized period (in years)						4 years 5 months 19 days	5 years 10 months 17 days
Granted | $						$ 103,486
Weighted-average remaining contractual term (years)						4 years 5 months 19 days		4 years 6 months 29 days
Granted (in shares)						11,758,000
Restricted Stock Units, Tax Account
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense related to unvested | $				60,400	80,800	$ 60,400	$ 80,800
Granted | $		$ 74,000	$ 49,200
Vested | $				3,600	4,500	$ 8,500	$ 8,000
Weighted-average remaining contractual term (years)						7 years 6 months 29 days	8 years 4 months 24 days
Share-based payment arrangement, expense | $				$ 4,300	5,100	$ 8,900	$ 11,100
Restricted Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Limited partnership units outstanding (in shares)				348,000		348,000		7,304,000
Unrecognized compensation expense related to unvested | $				$ 700		$ 700
Granted | $						$ 0
Weighted-average remaining contractual term (years)						8 years 3 days		7 months 2 days
Share-based payment arrangement, expense | $				$ 900	$ 8,900	$ 5,100	$ 44,300
Accelerated vesting of restricted stock (in shares)							4,300,000
Shares withheld to satisfy tax liabilities (in shares)				1,100,000		1,800,000
Accelerated vesting expense | $							$ 25,400
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						0.9273
LPUs | Newmark
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Limited partnership units outstanding (in shares)				2,414,000		2,414,000		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)				2,400,000	2,300,000	4,300,000	4,700,000
Share-based payment arrangement, decrease for tax withholding obligation | $				$ 12,500	$ 10,300	$ 20,900	$ 21,200
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)				101,852	36,465	372,504	672,632
Class A Common Stock | Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Value of shares withheld | $				$ 5,600	$ 16,100	$ 25,100	$ 27,900
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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