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Compensation - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019 | 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 | 134,500,000 |  |  |  |
Common stock exchangeable basis | one-for-one basis |  |  |  |
Limited partnership interests Exchange Ratio | 94.61% |  |  |  |
Number of share-equivalent limited partnership units exchangeable into shares | 4,400,000 |  | 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 | $ 9,000 |  | $ 10,700 |  |
Shares, Forfeited | 0 | 0 |  |  |
Number of shares released the restrictions | 100,000 | 300,000 |  |  |
Deferred cash compensation expense recognized | $ 187 | $ (7) |  |  |
Deferred cash compensation expense not yet recognized | $ 1,600 |  |  |  |
Deferred compensation expense, expected period of recognition | 1 year 8 months 1 day |  |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Unrecognized compensation expense related to unvested | $ 17,400 |  |  |  |
Unrecognized compensation expense related to unvested recognized period | 2 years 4 months 20 days |  |  |  |
Limited partnership units outstanding | 3,495,000 |  | 4,478,000 |  |
Restricted Shares [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Limited partnership units outstanding | 6,200,000 |  | 6,400,000 |  |
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 | $ 97,400 |  |  |  |
Unrecognized compensation expense related to unvested recognized period | 1 year 10 months 24 days |  |  |  |
Limited partnership units outstanding | 112,577,000 |  | 102,407,000 |  |
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] | Restricted Shares [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Limited partnership units outstanding | 100,000 | 100,000 |  |  |
Newmark [Member] | LPUs [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Limited partnership units outstanding | 14,576,000 |  | 14,607,000 |  |
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 | $ 900 |  | $ 1,000 |  |
Aggregate estimated fair value of limited partnership units | $ 200 |  | $ 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 | 1,100,000 |  | 1,200,000 |  |
Notional value with post-termination pay-out amount | $ 13,300 |  | $ 15,300 |  |
Aggregate estimated fair value of limited partnership units | $ 8,700 |  | $ 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 | $ 200 |  |  |  |
Liability for deferred cash compensation awards | $ 4,100 |  | $ 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 | 800,000 |  | 800,000 |  |
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 | $ 1,700 | $ 400 |  |  |
Class A Common Stock [Member] | Newmark [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Limited partnership interests Exchange Ratio | 94.61% |  |  |  |
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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