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Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018 | Dec. 13, 2018 | 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 | 154,400,000 |  |  |  |  |
Equity-based compensation expense | $ 1,100 |  |  |  |  |
Number of share-equivalent limited partnership units exchangeable into shares | 2,800,000 |  |  | 3,900,000 |  |
Number of unvested limited partnership units with post-termination pay-out |  |  | 300,000 |  |  |
Number of outstanding limited partnership units, unvested |  |  | 100,000 |  |  |
Aggregate estimated fair value of limited partnership units |  |  | $ 4,800 |  |  |
Income allocated to limited partnership units | $ 4,500 | $ 3,800 |  |  |  |
Restricted stock unit, Conversion description | Each RSU is settled in one share of Class A common stock upon completion of the vesting period. |  |  |  |  |
Shares, Forfeited | 0 | 0 |  |  |  |
Number of shares released the restrictions | 500,000 | 500,000 |  |  |  |
Cash received per share upon conversion | $ 6.10 |  |  |  |  |
Deferred cash compensation expense recognized | $ (7) | $ 1,311 |  |  |  |
Deferred cash compensation expense not yet recognized | $ 2,000 |  |  |  |  |
Deferred compensation expense, expected period of recognition | 1 year 9 months 14 days |  |  |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Equity-based compensation expense | $ 700 | $ 1,200 |  |  |  |
Awards granted | 138,784 | 49,000 |  |  |  |
Aggregate estimated grant date fair values | $ 800 | $ 600 |  |  |  |
Value of shares withheld | 400 | 1,300 |  |  |  |
Aggregate estimated grant date fair value of outstanding RSUs | 7,800 |  | $ 10,100 |  |  |
Unrecognized compensation expense related to unvested RSUs | 7,300 |  |  |  |  |
Share based compensation related acquisition | $ 300 | $ 0 |  |  |  |
Limited partnership units outstanding | 766,930 |  | 928,713 |  |  |
Restricted Shares [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Limited partnership units outstanding | 6,900,000 |  |  |  |  |
Minimum [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Restricted shares, restriction period | 2 years |  |  |  |  |
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 Stock Units (RSUs) [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Restricted shares, restriction period | 4 years |  |  |  |  |
Maximum [Member] | Restricted Shares [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Restricted shares saleable period | 10 years |  |  |  |  |
Limited Partnership Units [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of limited partnership units granted exchangeability |  | 1,500,000 |  |  |  |
Equity-based compensation expense | $ 5,000 | $ 34,500 |  |  |  |
Aggregate estimated fair value of limited partnership units | 3,600 |  | $ 3,600 |  |  |
Compensation expense before income tax related to limited partnership units | $ (500) | $ 200 |  |  |  |
Awards granted | 9,290,951 |  |  |  |  |
Limited partnership units outstanding | 80,943,527 |  | 79,729,188 |  |  |
Limited Partnership Units [Member] | Minimum [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Restricted shares, restriction period | 3 years |  |  |  |  |
Limited Partnership Units [Member] | Maximum [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Restricted shares, restriction period | 5 years |  |  |  |  |
BGC Holdings [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Redemptions of units | 200,000 |  |  |  |  |
Notional value with post-termination pay-out amount | $ 10,000 |  | $ 10,000 |  |  |
Number of unvested limited partnership units with post-termination pay-out | 300,000 |  | 300,000 |  |  |
Number of outstanding limited partnership units, unvested | 59,000 |  | 68,000 |  |  |
Aggregate estimated fair value of limited partnership units | $ 5,100 |  |  |  |  |
BGC Holdings [Member] | Limited Partnership Units [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of limited partnership units granted exchangeability | 300,000 | 3,200,000 |  |  |  |
Newmark [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Redemptions of units | 100,000 |  |  |  |  |
Notional value with post-termination pay-out amount | $ 1,000 |  |  |  |  |
Number of unvested limited partnership units with post-termination pay-out | 129,000 |  | 200,000 |  |  |
Number of outstanding limited partnership units, unvested | 85,000 |  | 31,000 |  |  |
Aggregate estimated fair value of limited partnership units | $ 100 |  |  |  |  |
Newmark [Member] | Limited Partnership Units [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of limited partnership units granted exchangeability | 100,000 | 1,400,000 |  |  |  |
Awards granted | 508,522 |  |  |  |  |
Limited partnership units outstanding | 15,488,589 |  | 22,113,105 |  |  |
GFI Group Inc. [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Deferred cash compensation expense recognized | $ 1,300 | $ 1,300 |  |  |  |
Liability for deferred cash compensation awards | $ 5,500 |  |  |  |  |
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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