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Compensation - Additional Information (Detail) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2021 USD ($) shares | Jun. 30, 2020 USD ($) shares | Jun. 30, 2021 USD ($) shares | Jun. 30, 2020 USD ($) shares | Dec. 31, 2020 USD ($) shares | Jun. 22, 2016 shares | Jun. 21, 2016 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Aggregate number of shares grant of future awards (in shares) | 86,400,000 |  | 86,400,000 |  |  |  |
Number of share-equivalent limited partnership units exchangeable into shares (in shares) | 2,900,000 |  | 2,900,000 |  | 3,500,000 |  |
Number of common stock settled per restricted stock unit (in shares) |  |  | 1 |  |  |  |
Aggregate estimated fair value of limited partnership units and restricted stock units | $ |  |  | $ 9,300 |  | $ 9,400 |  |
Aggregate estimated fair value of deferred compensation awards | $ |  |  | $ 19,800 |  | $ 23,600 |  |
Shares, forfeited (in shares) | 84,000 | 0 | 84,000 | 0 |  |  |
Number of shares released the restrictions (in shares) | 200,000 | 200,000 | 400,000 | 300,000 |  |  |
Deferred cash compensation expense recognized | $ |  |  | $ 289 | $ 404 |  |  |
Deferred cash compensation expense not yet recognized | $ | $ 200 |  | $ 200 |  |  |  |
Deferred compensation expense, expected period of recognition |  |  | 2 years 2 months 23 days |  |  |  |
Restricted Stock Units |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Unrecognized compensation expense related to unvested | $ | $ 40,800 |  | $ 40,800 |  |  |  |
Unrecognized compensation expense related to unvested recognized period |  |  | 2 years 7 months 24 days |  |  |  |
Limited partnership units outstanding (in shares) | 10,801,000 |  | 10,801,000 |  | 8,960,000 |  |
Restricted Shares |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Limited partnership units outstanding (in shares) | 3,300,000 |  | 3,300,000 |  | 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] |  |  |  |  |  |  |
Common stock exchangeable basis |  |  | 1 |  |  |  |
Limited partnership interests exchange ratio |  |  | 0.9403 |  |  |  |
Unrecognized compensation expense related to unvested | $ | $ 81,500 |  | $ 81,500 |  |  |  |
Unrecognized compensation expense related to unvested recognized period |  |  | 1 year 10 months 20 days |  |  |  |
Limited partnership units outstanding (in shares) | 118,690,000 |  | 118,690,000 |  | 137,652,000 |  |
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) | 0 | 100,000 | 100,000 | 100,000 |  |  |
Number of outstanding restricted shares held (in shares) | 1,600,000 |  | 1,600,000 |  | 1,700,000 |  |
Newmark | LPUs |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Limited partnership units outstanding (in shares) | 11,519,000 |  | 11,519,000 |  | 13,202,000 |  |
Newmark | LPUs | REUs |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Notional value with post-termination pay-out amount | $ | $ 800 |  | $ 800 |  | $ 800 |  |
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) | 1,300,000 |  | 1,300,000 |  | 1,300,000 |  |
Notional value with post-termination pay-out amount | $ | $ 12,700 |  | $ 12,700 |  | $ 12,700 |  |
Aggregate estimated fair value of limited partnership units | $ | $ 7,500 |  | $ 7,500 |  | $ 7,500 |  |
Number of outstanding limited partnership units, unvested (in shares) | 100,000 |  | 100,000 |  | 100,000 |  |
GFI Group Inc. |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Deferred cash compensation expense recognized | $ | $ 200 | $ 200 | $ 300 | $ 400 |  |  |
Liability for deferred cash compensation awards | $ | $ 700 |  | $ 700 |  | $ 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 |  | 400,000 |  | 500,000 |  |
Shares, forfeited (in shares) | 83,765 | 0 | 83,765 | 0 |  |  |
Class A Common Stock | Restricted Stock Units |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Value of shares withheld | $ | $ 600 | $ 40 | $ 3,800 | $ 1,700 |  |  |
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) |  |  |  |  |  | 400,000,000 | 350,000,000

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