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Compensation - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020 | 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 | 108,200,000 |  |  |  |
Common stock exchangeable basis | one-for-one basis |  |  |  |
Limited partnership interests Exchange Ratio | 93.65% |  |  |  |
Number of share-equivalent limited partnership units exchangeable into shares | 5,600,000 |  | 3,500,000 |  |
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 | $ 9,600 |  | $ 9,400 |  |
Aggregate estimated fair value of deferred compensation awards | $ 24,600 |  | $ 23,600 |  |
Shares, Forfeited | 0 | 200,000 |  |  |
Number of shares released the restrictions | 200,000 | 100,000 |  |  |
Deferred cash compensation expense recognized | $ 128 | $ 187 |  |  |
Deferred cash compensation expense not yet recognized | $ 300 |  |  |  |
Deferred compensation expense, expected period of recognition | 1 year 8 months 15 days |  |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Unrecognized compensation expense related to unvested | $ 26,200 |  |  |  |
Unrecognized compensation expense related to unvested recognized period | 2 years 4 months 24 days |  |  |  |
Limited partnership units outstanding | 7,222,000 |  | 8,960,000 |  |
Restricted Shares [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Limited partnership units outstanding | 3,500,000 |  | 3,700,000 |  |
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 | $ 83,600 |  |  |  |
Unrecognized compensation expense related to unvested recognized period | 2 years 1 month 20 days |  |  |  |
Limited partnership units outstanding | 133,805,000 |  | 137,652,000 |  |
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 | 100,000 | 100,000 |  |  |
Number of outstanding restricted shares held | 1,600,000 |  | 1,700,000 |  |
Newmark [Member] | LPUs [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Limited partnership units outstanding | 12,317,000 |  | 13,202,000 |  |
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 |  | $ 800 |  |
Aggregate estimated fair value of limited partnership units | $ 300 |  | $ 300 |  |
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 |  | 1,300,000 |  |
Notional value with post-termination pay-out amount | $ 12,700 |  | $ 12,700 |  |
Aggregate estimated fair value of limited partnership units | $ 7,400 |  | $ 7,500 |  |
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 | $ 100 | $ 200 |  |  |
Liability for deferred cash compensation awards | $ 1,800 |  | $ 1,500 |  |
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 | 400,000 |  | 500,000 |  |
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 | $ 3,200 | $ 1,700 |  |  |
Class A Common Stock [Member] | Newmark [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Limited partnership interests Exchange Ratio | 93.65% |  |  |  |
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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