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Compensation - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jun. 22, 2016 | Jun. 21, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Aggregate number of shares grant of future awards | 118,500,000 |  |  |  |  |
Common stock exchangeable basis | one-for-one basis |  |  |  |  |
Limited partnership interests Exchange Ratio | 93.79% |  |  |  |  |
Number of share-equivalent limited partnership units exchangeable into shares | 3,500,000 | 3,100,000 |  |  |  |
Restricted stock unit, Conversion description | Each RSU is settled in one share of Class A common stock upon completion of the vesting period. |  |  |  |  |
Aggregate estimated fair value of limited partnership units and restricted stock units | $ 9,400 | $ 10,700 |  |  |  |
Aggregate estimated fair value of the deferred compensation awards | $ 23,600 | $ 22,600 |  |  |  |
Shares, Forfeited | 0 | 22,000 |  |  |  |
Number of shares released the restrictions | 700,000 | 700,000 |  |  |  |
Deferred cash compensation expense recognized | $ 630 | $ 5,879 | $ 5,879 |  |  |
Deferred cash compensation expense not yet recognized | $ 400 |  |  |  |  |
Deferred compensation expense, expected period of recognition | 1 year 7 months 9 days |  |  |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Unrecognized compensation expense related to unvested | $ 28,200 |  |  |  |  |
Unrecognized compensation expense related to unvested recognized period | 2 years 5 months 15 days |  |  |  |  |
Limited partnership units outstanding | 8,960,000 | 4,478,000 | 929,000 | 1,063,000 |  |
Number of Units, Balance outstanding | 8,960,000 | 4,478,000 | 929,000 | 1,063,000 |  |
Restricted Shares [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Limited partnership units outstanding | 3,700,000 | 4,400,000 |  |  |  |
Number of Units, Balance outstanding | 3,700,000 | 4,400,000 |  |  |  |
Minimum [Member] | Restricted Shares [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Restricted shares saleable period | 5 years |  |  |  |  |
Maximum [Member] | Restricted Shares [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Restricted shares saleable period | 10 years |  |  |  |  |
LPUs [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Unrecognized compensation expense related to unvested | $ 70,000 |  |  |  |  |
Unrecognized compensation expense related to unvested recognized period | 2 years 3 months 25 days |  |  |  |  |
Limited partnership units outstanding | 137,652,000 | 102,407,000 | 79,729,000 | 58,323,000 |  |
Number of Units, Balance outstanding | 137,652,000 | 102,407,000 | 79,729,000 | 58,323,000 |  |
LPUs [Member] | Minimum [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Restricted shares, restriction period | 2 years |  |  |  |  |
LPUs [Member] | Maximum [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Restricted shares, restriction period | 5 years |  |  |  |  |
Newmark [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of shares released the restrictions | 300,000 | 300,000 |  |  |  |
Newmark [Member] | Restricted Shares [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Limited partnership units outstanding | 1,700,000 | 2,100,000 |  |  |  |
Number of Units, Balance outstanding | 1,700,000 | 2,100,000 |  |  |  |
Newmark [Member] | LPUs [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Limited partnership units outstanding | 13,202,000 | 14,607,000 | 22,113,000 | 26,510,000 |  |
Number of Units, Balance outstanding | 13,202,000 | 14,607,000 | 22,113,000 | 26,510,000 |  |
Newmark [Member] | LPUs [Member] | REUs [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Notional value with post-termination pay-out amount | $ 800 | $ 1,000 |  |  |  |
Aggregate estimated fair value of limited partnership units | $ 300 | $ 200 |  |  |  |
BGC Holdings [Member] | LPUs [Member] | REUs [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of unvested limited partnership units with post-termination pay-out | 1,300,000 | 1,200,000 |  |  |  |
Notional value with post-termination pay-out amount | $ 12,700 | $ 15,300 |  |  |  |
Aggregate estimated fair value of limited partnership units | $ 7,500 | $ 10,000 |  |  |  |
Number of outstanding limited partnership units, unvested | 100,000 | 100,000 |  |  |  |
GFI Group Inc. [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Deferred cash compensation expense recognized | $ 800 | $ 5,900 | $ 4,700 |  |  |
Liability for deferred cash compensation awards | $ 1,500 | $ 3,500 |  |  |  |
Class A Common Stock [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of share-equivalent limited partnership units exchangeable into shares | 500,000 | 800,000 |  |  |  |
Shares, Forfeited |  | 22,000 | 231,602 |  |  |
Class A Common Stock [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Value of shares withheld | $ 1,900 | $ 500 |  |  |  |
Class A Common Stock [Member] | Newmark [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Limited partnership interests Exchange Ratio | 93.73% |  |  |  |  |
Equity Plan [Member] | Class A Common Stock [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares authorized to be delivered pursuant to awards granted |  |  |  |  | 400,000,000 | 350,000,000

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