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Compensation - Narrative (Detail) $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2023 USD ($) shares | Jun. 30, 2022 USD ($) shares | Jun. 30, 2023 USD ($) shares | Jun. 30, 2022 USD ($) shares | Sep. 30, 2022 USD ($) | Dec. 31, 2022 USD ($) 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) | 90,000,000 |  | 90,000,000 |  |  |  |  |
Number of share-equivalent limited partnership units exchangeable into shares (in shares) | 200,000 |  | 200,000 |  |  | 1,200,000 |  |
Number of common stock settled per restricted stock unit (in shares) |  |  | 1 |  |  |  |  |
Aggregate estimated fair value of limited partnership units and restricted stock units | $ |  |  | $ 5,800 |  | $ 5,900 |  |  |
Aggregate estimated fair value of deferred compensation awards | $ |  |  | $ 200 |  |  | $ 23,900 |  |
Shares, forfeited (in shares) | 200,000 | 0 | 200,000 | 0 |  |  |  |
Number of shares released the restrictions (in shares) | 2,100,000 | 100,000 | 2,300,000 | 200,000 |  |  |  |
Restricted Stock Units |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Unrecognized compensation expense related to unvested | $ | $ 123,100 |  | $ 123,100 |  |  |  |  |
Unrecognized compensation expense related to unvested recognized period |  |  | 5 years 6 months |  |  |  |  |
Limited partnership units outstanding (in shares) | 34,767,000 |  | 34,767,000 |  |  | 12,046,000 |  |
Granted | $ |  |  | $ 95,340 |  |  |  |  |
Weighted- Average Remaining Contractual Term (Years) |  |  | 5 years 5 months 26 days |  |  | 2 years 5 months 1 day |  |
Restricted Shares |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Limited partnership units outstanding (in shares) | 100,000 |  | 100,000 |  |  | 2,300,000 |  |
Restricted Stock Units, Tax Account |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Unrecognized compensation expense related to unvested | $ | $ 48,200 |  | $ 48,200 |  |  |  |  |
Granted | $ | 49,200 |  |  |  |  |  |  |
Weighted- Average Remaining Contractual Term (Years) |  |  |  |  |  | 9 years 3 months 18 days |  |
Minimum | Restricted Shares |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Restricted shares saleable period |  |  | 5 years |  |  |  |  |
Maximum | Restricted Shares |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Restricted shares saleable period |  |  | 10 years |  |  |  |  |
LPUs |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Common stock exchangeable basis |  |  | 1 |  |  |  |  |
Limited partnership interests exchange ratio |  |  | 0.9235 |  |  |  |  |
Unrecognized compensation expense related to unvested | $ | $ 84,000 |  | $ 84,000 |  |  |  |  |
Unrecognized compensation expense related to unvested recognized period |  |  | 1 year 11 months 12 days |  |  |  |  |
Limited partnership units outstanding (in shares) | 71,594,000 |  | 71,594,000 |  |  | 110,347,000 |  |
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) | 1,100,000 | 100,000 | 1,100,000 | 100,000 |  |  |  |
Number of outstanding restricted shares held (in shares) | 0 |  | 0 |  |  | 1,100,000 |  |
Newmark | LPUs |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Limited partnership units outstanding (in shares) | 9,003,000 |  | 9,003,000 |  |  | 9,351,000 |  |
Newmark | LPUs | REUs |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Notional value with post-termination pay-out amount | $ | $ 700 |  | $ 700 |  |  | $ 700 |  |
Aggregate estimated fair value of limited partnership units | $ | $ 300 |  | $ 300 |  |  | $ 300 |  |
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) | 200,000 |  | 200,000 |  |  | 800,000 |  |
Notional value with post-termination pay-out amount | $ | $ 1,700 |  | $ 1,700 |  |  | $ 8,600 |  |
Aggregate estimated fair value of limited partnership units | $ | $ 1,200 |  | $ 1,200 |  |  | $ 3,900 |  |
Number of outstanding limited partnership units, unvested (in shares) | 100,000 |  | 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 |  | 200,000 |  |  | 200,000 |  |
Shares, forfeited (in shares) | 189,726 | 4,419 | 238,927 | 4,419 |  |  |  |
Class A Common Stock | Restricted Stock Units |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Value of shares withheld | $ | $ 1,400 | $ 700 | $ 7,600 | $ 6,200 |  |  |  |
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

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