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Compensation - Additional Information (Detail) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2018 USD ($) shares | Mar. 31, 2017 USD ($) shares | Dec. 31, 2017 USD ($) shares | Dec. 13, 2017 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Exchange ratio standalone number of units | $ | $ 0.7 |  |  |
Notional value with post-termination pay-out amount | $ | 139.2 |  |  |
Aggregate estimated fair value of limited partnership units | $ | 28.6 |  |  |
Income allocated to limited partnership units | $ | $ 4.1 | $ 4.6 |  |
Restricted stock unit, Conversion description | Each RSU is settled in one share of BGC’s Class A common stock upon completion of the vesting period. Future RSU awards will be settled in one share of Newmark Class A common stock upon completion of the vesting period. |  |  |
Deferred cash compensation expense recognized | $ | $ 1.1 | 0.2 |  |
Liability for deferred cash compensation awards | $ | $ 0.6 |  | $ 0.4 |
Restricted Stock Units (RSUs) [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Limited partnership units outstanding | 241,295 |  | 346,538 |
Equity-based compensation expense | $ | $ 0.3 | $ 0.3 |  |
Awards granted |  | 300,000 |  |
Aggregate estimated grant date fair values | $ |  | $ 2.8 |  |
Aggregate estimated grant date fair value of outstanding RSUs | $ | 2.3 |  | $ 3.3 |
Unrecognized compensation expense related to unvested RSUs | $ | 2.5 |  |  |
Executives and Non-Executive Employees [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Notional value with post-termination pay-out amount | $ | 21.6 |  | $ 232.9 |
Aggregate estimated fair value of limited partnership units | $ | $ 39.2 |  |  |
Number of unvested limited partnership units with post-termination pay-out |  |  | 23,400,000 |
Number of outstanding limited partnership units, unvested |  |  | 13,200,000 |
Limited Partnership Units [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Limited partnership units outstanding | 33,011,995 |  | 29,413,143 |
Aggregate estimated fair value of limited partnership units | $ | $ 6.7 |  | $ 14.3 |
Compensation expense (benefit) before income tax related to limited partnership units | $ | $ (8.7) | 5.8 |  |
Awards granted | 3,767,619 |  |  |
BGC Holdings, L.P. [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of limited partnership units exchangeable into shares | 17,200,000 |  | 12,300,000 |
Number of unvested limited partnership units with post-termination pay-out | 13,800,000 |  |  |
Number of outstanding limited partnership units, unvested | 6,600,000 |  |  |
BGC Holdings, L.P. [Member] | Executives and Non-Executive Employees [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of unvested limited partnership units with post-termination pay-out |  |  | 23,400,000 |
Number of outstanding limited partnership units, unvested |  |  | 13,200,000 |
BGC Holdings, L.P. [Member] | Limited Partnership Units [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Limited partnership units outstanding | 64,337,628 |  | 64,708,915 |
Number of limited partnership units granted exchangeability | 1,500,000 |  |  |
Equity-based compensation expense | $ | $ 21.7 | $ 6.0 |  |
Newmark Holdings, L.P. [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of limited partnership units exchangeable into shares | 8,100,000 |  | 5,600,000 |
Number of unvested limited partnership units with post-termination pay-out | 6,300,000 |  |  |
Number of outstanding limited partnership units, unvested | 3,000,000 |  |  |
Newmark Holdings, L.P. [Member] | Executives and Non-Executive Employees [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Aggregate estimated fair value of limited partnership units | $ | $ 2.1 |  |  |
Number of unvested limited partnership units with post-termination pay-out | 1,500,000 |  | 10,600,000 |
Number of outstanding limited partnership units, unvested | 1,100,000 |  | 6,000,000 |
Newmark Holdings, L.P. [Member] | Limited Partnership Units [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of limited partnership units granted exchangeability | 700,000 | 600,000 |  |
Equity-based compensation expense | $ | $ 0.0 |  |  |
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] | Limited Partnership Units [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Restricted shares, restriction period | 5 years |  |  |
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] | Limited Partnership Units [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Restricted shares, restriction period | 3 years |  |  |
Class A Common Stock [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Limited partnership units exchange ratio | 1 |  |  |
Class A Common Stock [Member] | Newmark Holdings, L.P. [Member] | Limited Partnership Units [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Limited partnership units outstanding | 33,000,000 |  | 29,400,000 |
Limited partnership units issued | 3,800,000 |  |  |
Newmark Equity Plan [Member] | Class A Common Stock [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares registered to be delivered pursuant to awards granted |  |  |  | 50,000,000
Newmark Equity Plan [Member] | Class A Common Stock [Member] | Maximum [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares authorized to be delivered pursuant to awards granted |  |  |  | 400,000,000

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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