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Compensation - Additional Information (Detail) $ in Thousands |  |  | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jul. 01, 2023 USD ($) shares | Jun. 30, 2023 USD ($) shares | Oct. 31, 2023 shares | Dec. 31, 2023 USD ($) shares | Dec. 31, 2022 USD ($) shares | Dec. 31, 2021 USD ($) shares | Dec. 31, 2020 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) |  |  |  | 477,100,000 |  |  |  |  |  |
Restricted stock awards |  |  |  | 38,610,233 | 0 |  |  |  |  |
Restricted stock awards granted upon conversion of limited partnership interests due to the Corporate Conversion, 38,610,233 shares | $ |  |  |  | $ 0 |  |  |  |  |  |
Limited partnership interest, conversion ratio |  |  |  | 1 |  |  |  |  |  |
Number of share-equivalent limited partnership units exchangeable into shares (in shares) |  |  |  |  | 1,200,000 |  |  |  |  |
Number of restricted stock unit settled per common stock (in shares) |  |  |  | 1 |  |  |  |  |  |
Aggregate estimated fair value of limited partnership units and restricted stock units | $ |  |  |  | $ 7,400 | $ 5,900 |  |  |  |  |
Aggregate estimated fair value of the deferred compensation awards | $ |  |  |  | $ 600 | $ 23,900 |  |  |  |  |
Shares, forfeited (in shares) |  |  |  | 1,400,000 | 100,000 |  |  |  |  |
Number of shares released the restrictions (in shares) |  |  |  | 2,300,000 | 300,000 |  |  |  |  |
Deferred cash compensation expense recognized | $ |  |  |  | $ 54 | $ (542) | $ 347 |  |  |  |
Shares withheld to satisfy tax liabilities (in shares) |  |  | 1,000,000 |  |  |  |  |  |  |
Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Restricted stock awards | 25,300,000 | 22,500,000 |  |  |  |  |  |  |  |
Fair value of shares granted | $ |  |  |  | 283,418 | $ 30,406 | $ 26,716 |  |  |  |
Unrecognized compensation expense related to unvested | $ |  |  |  | $ 161,000 |  |  |  |  |  |
Unrecognized compensation expense related to unvested recognized period |  |  |  | 5 years 11 months 15 days |  |  |  |  |  |
Limited partnership units outstanding (in shares) |  |  |  | 64,942,000 | 12,046,000 | 11,034,000 | 8,960,000 |  |  |
Weighted- Average Remaining Contractual Term (Years) |  |  |  | 5 years 11 months 15 days | 2 years 5 months 1 day | 2 years 3 months 7 days | 2 years 5 months 15 days |  |  |
Number of Units, Granted (in shares) |  |  |  | 68,732,000 | 7,125,000 | 6,319,000 |  |  |  |
Restricted Stock Units (RSUs) | Eligible |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Limited partnership units outstanding (in shares) |  |  |  | 26,300,000 |  |  |  |  |  |
Restricted Shares |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Restricted stock awards | 38,600,000 |  |  |  |  |  |  |  |  |
Fair value of shares granted | $ |  |  |  | $ 168,716 |  |  |  |  |  |
Unrecognized compensation expense related to unvested | $ |  |  |  | $ 49,900 |  |  |  |  |  |
Limited partnership units outstanding (in shares) |  |  |  | 27,953,000 | 0 |  |  |  |  |
Weighted- Average Remaining Contractual Term (Years) |  |  |  | 2 years 6 months 18 days |  |  |  |  |  |
Equity-based compensation expense | $ |  |  |  | $ 24,700 |  |  |  |  |  |
Number of Units, Granted (in shares) | 38,600,000 |  |  | 38,610,000 |  |  |  |  |  |
Restricted Shares | Eligible |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Limited partnership units outstanding (in shares) |  |  |  | 5,800,000 |  |  |  |  |  |
Non-exchangeable LPUs |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Redemption (in shares) | 54,000,000 | 16,900,000 |  |  |  |  |  |  |  |
Non-exchangeable FPUs |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Redemption (in shares) |  | 5,600,000 |  |  |  |  |  |  |  |
Restricted Stock Units, Tax Account |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Restricted stock awards granted upon conversion of limited partnership interests due to the Corporate Conversion, 38,610,233 shares | $ |  | $ 49,200 |  | $ 123,100 |  |  |  |  |  |
Fair value of shares granted | $ | $ 74,000 |  |  |  |  |  |  |  |  |
Unrecognized compensation expense related to unvested | $ |  |  |  | $ 92,700 |  |  |  |  |  |
Weighted- Average Remaining Contractual Term (Years) |  |  |  | 8 years 9 months 25 days |  |  |  |  |  |
Equity-based compensation expense | $ |  |  |  | $ 31,900 |  |  |  |  |  |
Fair value of shares vested | $ |  |  |  | $ 27,700 |  |  |  |  |  |
Shares withheld to satisfy tax liabilities (in shares) |  |  |  | 1,000,000 |  |  |  |  |  |
Non-exchangeable PSU |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Redemption (in shares) | 9,900,000 | 10,600,000 |  |  |  |  |  |  |  |
Restricted BGC Stock |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Limited partnership units outstanding (in shares) |  |  |  | 100,000 | 2,300,000 |  |  |  |  |
Minimum | Restricted Shares |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Shares vesting period |  |  |  | 5 years |  |  |  |  |  |
Maximum | Restricted Shares |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Shares vesting period |  |  |  | 10 years |  |  |  |  |  |
LPUs |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Limited partnership units outstanding (in shares) |  |  |  | 0 | 110,348,000 | 112,115,000 | 137,652,000 |  |  |
Number of Units, Granted (in shares) |  |  |  | 9,688,000 | 27,968,000 | 34,093,000 |  |  |  |
LPUs | Minimum |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Restricted shares, restriction period |  |  |  | 2 years |  |  |  |  |  |
LPUs | Maximum |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Restricted shares, restriction period |  |  |  | 5 years |  |  |  |  |  |
Newmark |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Number of shares released the restrictions (in shares) |  |  |  | 1,000,000 | 100,000 |  |  |  |  |
Newmark | Restricted Shares |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Limited partnership units outstanding (in shares) |  |  |  | 0 | 1,100,000 |  |  |  |  |
Newmark | LPUs |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Limited partnership units outstanding (in shares) |  |  |  | 8,779,000 | 9,351,000 | 11,051,000 | 13,202,000 |  |  |
Number of Units, Granted (in shares) |  |  |  | 0 | 0 | 0 |  |  |  |
Newmark | LPUs | REUs |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Notional value with post-termination pay-out amount | $ |  |  |  | $ 700 | $ 700 |  |  |  |  |
Aggregate estimated fair value of limited partnership units | $ |  |  |  | $ 300 | $ 300 |  |  |  |  |
BGC Holdings | Non-exchangeable PSU |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Redemption (in shares) | 16,300,000 |  |  |  |  |  |  |  |  |
BGC Holdings | LPUs | REUs |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Number of unvested limited partnership units with post-termination pay-out (in shares) |  |  |  | 0 | 800,000 |  |  |  |  |
Notional value with post-termination pay-out amount | $ |  |  |  |  | $ 8,600 |  |  |  |  |
Aggregate estimated fair value of limited partnership units | $ |  |  |  |  | $ 3,900 |  |  |  |  |
Number of outstanding limited partnership units, unvested (in shares) |  |  |  | 100,000 | 100,000 |  |  |  |  |
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 |  |  |  |  |  |
Shares, forfeited (in shares) |  |  |  | 1,428,000 | 67,000 |  |  |  |  |
Class A Common Stock | Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Value of shares withheld | $ |  |  |  | $ 11,500 | $ 6,600 |  |  |  |  |
Class A Common Stock | Newmark |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Limited partnership interests exchange ratio |  |  |  | 92.31% |  |  |  |  |  |
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 | 400,000,000 | 600,000,000

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