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Cover Page - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Feb. 26, 2024
Jun. 30, 2023
Document Information      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2023    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 001-38329    
Entity Registrant Name NEWMARK GROUP, INC.    
Entity Incorporation, State DE    
Entity Tax Identification Number 81-4467492    
Entity Address, Street 125 Park Avenue    
Entity Address, City New York    
Entity Address, State NY    
Entity Address, Postal Zip Code 10017    
City Area Code 212    
Local Phone Number 372-2000    
Title of 12(b) Security Class A Common Stock, $0.01 par value    
Trading Symbol NMRK    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction false    
Entity Shell Company false    
Entity Public Float     $ 814.4
Documents Incorporated by Reference
Portions of the registrant’s definitive proxy statement for its 2024 annual meeting of stockholders are incorporated by reference in Part III of this Annual Report on Form 10-K.
We anticipate that we will file such proxy statement with the SEC on or before April 29, 2024.
    
Amendment Flag false    
Document Fiscal Year Focus 2023    
Document Fiscal Period Focus FY    
Entity Central Index Key 0001690680    
Class A Common Stock      
Document Information      
Entity Common Stock, Shares Outstanding   151,384,467  
Class B Common Stock      
Document Information      
Entity Common Stock, Shares Outstanding   21,285,533