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Compensation - Additional Information (Details)		3 Months Ended		6 Months Ended
	Jan. 01, 2018	Jun. 30, 2021 USD ($) shares	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) shares	Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($) shares	Dec. 31, 2019 shares	Dec. 13, 2017 shares
Share-based Compensation Arrangement by Share-based Payment Award
Shares available for future awards (in shares)		336,400,000		336,400,000
Number of shares vested and converted (in shares)		800,000		1,300,000
Unrecognized compensation expense related to unvested RSUs | $		$ 87,800,000		$ 87,800,000
Deferred cash compensation expense recognized | $			$ 100,000	35,000	$ 200,000
Liability for deferred cash compensation awards | $		$ 0		$ 0		$ 1,300,000
Executives And Non Executives Employees
Share-based Compensation Arrangement by Share-based Payment Award
Limited partners capital account units held by BGC (in shares)		63,600,000		63,600,000
Non Distribution Earning Units
Share-based Compensation Arrangement by Share-based Payment Award
Award vesting period (in years)				4 years
Unit granted during period (in shares)		800,000		2,100,000
Newmark Holdings, L.P.
Share-based Compensation Arrangement by Share-based Payment Award
Limited partnership units exchange ratio (in percentage)		0.4545		0.4545
Newmark Holdings, L.P. | Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award
Limited partnership units outstanding (in shares)		11,027,299		11,027,299		10,646,797	4,683,571
BGC Holdings, L.P.
Share-based Compensation Arrangement by Share-based Payment Award
Limited partnership units outstanding (in shares)		12,863,306		12,863,306		54,422,002	56,053,701
BGC Holdings, L.P. | Limited Partnership Units
Share-based Compensation Arrangement by Share-based Payment Award
Limited partnership units outstanding (in shares)		7,700,000		7,700,000		9,100,000
Exchangeable partnership units (in shares)		3,500,000		3,500,000		4,500,000
NEWMARK Group Inc Parent
Share-based Compensation Arrangement by Share-based Payment Award
Limited partners capital account units held by BGC (in shares)		9,385,036		9,385,036		20,184,716
Limited partnership units outstanding (in shares)		14,216,722		14,216,722		66,626,185	60,800,852
NEWMARK Group Inc Parent | Limited Partnership Units
Share-based Compensation Arrangement by Share-based Payment Award
Limited partnership units outstanding (in shares)		4,700,000		4,700,000		5,300,000
Exchangeable partnership units (in shares)		1,700,000		1,700,000		2,000,000.0
Maximum | Newmark Holdings, L.P. | Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award
Award vesting period (in years)	8 years
Maximum | NEWMARK Group Inc Parent | Limited Partnership Units
Share-based Compensation Arrangement by Share-based Payment Award
Award vesting period (in years)				7 years
Minimum | Newmark Holdings, L.P. | Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award
Award vesting period (in years)	2 years
Minimum | NEWMARK Group Inc Parent | Limited Partnership Units
Share-based Compensation Arrangement by Share-based Payment Award
Award vesting period (in years)				3 years
Common Class A
Share-based Compensation Arrangement by Share-based Payment Award
Limited partnership units exchange ratio (in percentage)								1
Common Class A | NEWMARK Group Inc Parent
Share-based Compensation Arrangement by Share-based Payment Award
Limited partnership units exchange ratio (in percentage)		0.9403		0.9403
Newmark Equity Plan | Common Class A | Maximum
Share-based Compensation Arrangement by Share-based Payment Award
Shares authorized to be delivered pursuant to awards granted (in shares)								400,000,000.0
Shares registered to be delivered pursuant to awards granted (in shares)								65,000,000.0

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