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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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