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Compensation - Narrative (Details)		3 Months Ended
	Apr. 04, 2023 shares	Mar. 31, 2023 USD ($) shares	Mar. 31, 2022 USD ($) shares	Dec. 31, 2022 shares	Dec. 31, 2021 shares	Dec. 13, 2017 shares
Share-based Compensation Arrangement by Share-based Payment Award
Shares available for future awards (in shares)		317,000,000
Limited partnership units exchange ratio		0.4545
Issuance of common stock and exchangeability expenses | $		$ 24,583,000	$ 8,983,000
Number of shares vested and converted (in shares)		2,500,000	2,400,000
Unrecognized compensation expense related to unvested RSUs | $		$ 98,200,000
Limited Partnership Units
Share-based Compensation Arrangement by Share-based Payment Award
Issuance of common stock and exchangeability expenses | $		$ 0	$ 0
Executives and Non Executives Employees
Share-based Compensation Arrangement by Share-based Payment Award
Limited partners capital account units held by BGC (in shares)		83,000,000
Non Distribution Earning Units
Share-based Compensation Arrangement by Share-based Payment Award
Award vesting period		4 years
Unit granted during period (in shares)		1,100,000	900,000
Newmark Holdings, L.P.
Share-based Compensation Arrangement by Share-based Payment Award
Limited partnership units exchange ratio		0.4545
NEWMARK Group Inc Parent
Share-based Compensation Arrangement by Share-based Payment Award
Limited partners capital account units held by BGC (in shares)		15,284,618		14,277,213
Limited partnership units outstanding (in shares)		32,860,605		30,687,954	18,419,613
NEWMARK Group Inc Parent | Limited Partnership Units
Share-based Compensation Arrangement by Share-based Payment Award
Limited partnership units outstanding (in shares)		3,700,000		3,900,000
Exchangeable partnership units (in shares)		1,400,000		1,500,000
NEWMARK Group Inc Parent | Limited Partnership Units
Share-based Compensation Arrangement by Share-based Payment Award
Issuance of common stock and exchangeability expenses | $		$ 24,583,000	$ 8,983,000
BGC Holdings, L.P.
Share-based Compensation Arrangement by Share-based Payment Award
Limited partnership units outstanding (in shares)		5,149,535		5,459,388	8,663,930
BGC Holdings, L.P. | Limited Partnership Units
Share-based Compensation Arrangement by Share-based Payment Award
Limited partnership units outstanding (in shares)		4,600,000		4,800,000
Exchangeable partnership units (in shares)		2,300,000		2,500,000
Maximum | NEWMARK Group Inc Parent | Limited Partnership Units
Share-based Compensation Arrangement by Share-based Payment Award
Award vesting period		7 years
Class A Common Stock
Share-based Compensation Arrangement by Share-based Payment Award
Limited partnership units exchange ratio						1
Class A Common Stock | NEWMARK Group Inc Parent
Share-based Compensation Arrangement by Share-based Payment Award
Limited partnership units exchange ratio		0.9252
Newmark Equity Plan | Class A Common Stock | Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award
Additional shares authorized to be delivered pursuant to awards granted (in shares)	100,000,000
Newmark Equity Plan | Class A Common Stock | Maximum
Share-based Compensation Arrangement by Share-based Payment Award
Shares authorized to be delivered pursuant to awards granted (in shares)						400,000,000
Shares registered to be delivered pursuant to awards granted (in shares)						115,000,000

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