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Compensation - Additional Information (Detail) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2021 USD ($) shares | Dec. 31, 2020 USD ($) shares | Dec. 31, 2019 USD ($) shares | Nov. 22, 2021 shares | Nov. 21, 2021 shares | Dec. 31, 2018 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Aggregate number of shares grant of future awards (in shares) | 164,500,000 |  |  |  |  |
Limited partnership interest, conversion ratio | 1 |  |  |  |  |
Number of share-equivalent limited partnership units exchangeable into shares (in shares) | 1,300,000 | 3,500,000 |  |  |  |
Number of restricted stock unit settled per common stock (in shares) | 1 |  |  |  |  |
Aggregate estimated fair value of limited partnership units and restricted stock units | $ | $ 8,900 | $ 9,400 |  |  |  |
Aggregate estimated fair value of the deferred compensation awards | $ | $ 21,700 | $ 23,600 |  |  |  |
Shares, forfeited (in shares) | 140,000 | 0 |  |  |  |
Number of shares released the restrictions (in shares) | 1,100,000 | 700,000 |  |  |  |
Deferred cash compensation expense recognized | $ | $ 347 | $ 630 | $ 5,879 |  |  |
Deferred cash compensation expense not yet recognized | $ | $ 100 |  |  |  |  |
Deferred compensation expense, expected period of recognition | 2 years 3 months 10 days |  |  |  |  |
Restricted Stock Units (RSUs) |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Unrecognized compensation expense related to unvested | $ | $ 35,600 |  |  |  |  |
Unrecognized compensation expense related to unvested recognized period | 2 years 3 months 7 days |  |  |  |  |
Limited partnership units outstanding (in shares) | 11,034,000 | 8,960,000 | 4,478,000 |  |  | 929,000
Restricted Shares |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Limited partnership units outstanding (in shares) | 2,600,000 | 3,700,000 |  |  |  |
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] |  |  |  |  |  |
Unrecognized compensation expense related to unvested | $ | $ 100,900 |  |  |  |  |
Unrecognized compensation expense related to unvested recognized period | 2 years 1 month 6 days |  |  |  |  |
Limited partnership units outstanding (in shares) | 112,115,000 | 137,652,000 | 102,407,000 |  |  | 79,729,000
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) | 500,000 | 300,000 |  |  |  |
Newmark | Restricted Shares |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Limited partnership units outstanding (in shares) | 1,200,000 | 1,700,000 |  |  |  |
Newmark | LPUs |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Limited partnership units outstanding (in shares) | 11,051,000 | 13,202,000 | 14,607,000 |  |  | 22,113,000
Newmark | LPUs | REUs |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Notional value with post-termination pay-out amount | $ | $ 800 | $ 800 |  |  |  |
Aggregate estimated fair value of limited partnership units | $ | $ 400 | $ 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) | 1,300,000 | 1,300,000 |  |  |  |
Notional value with post-termination pay-out amount | $ | $ 12,400 | $ 12,700 |  |  |  |
Aggregate estimated fair value of limited partnership units | $ | $ 7,400 | $ 7,500 |  |  |  |
Number of outstanding limited partnership units, unvested (in shares) | 100,000 | 100,000 |  |  |  |
GFI Group Inc. |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Deferred cash compensation expense recognized | $ | $ 300 | $ 800 | $ 5,900 |  |  |
Liability for deferred cash compensation awards | $ | $ 800 | $ 1,500 |  |  |  |
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) | 400,000 | 500,000 |  |  |  |
Shares, forfeited (in shares) | 140,000 | 0 |  |  |  |
Class A Common Stock | Restricted Stock Units (RSUs) |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Value of shares withheld | $ | $ 4,400 | $ 1,900 |  |  |  |
Class A Common Stock | Newmark |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Limited partnership interests exchange Ratio | 94.44% |  |  |  |  |
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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