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Compensation - Narrative (Detail) $ / shares in Units, $ in Thousands |  |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
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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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