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Cover Page - USD ($)
 12 Months Ended
Dec. 31, 2019
Feb. 26, 2020
Jun. 30, 2019
Document Information [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Transition Report false    
Document Period End Date Dec. 31, 2019    
Entity File Number 001-38329    
Entity Registrant Name NEWMARK GROUP, INC.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 81-4467492    
Entity Address, Address Line One 125 Park Avenue    
Entity Address, City or Town New York    
Entity Address, State or Province 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    
Entity Shell Company false    
Entity Public Float     $ 1,323,446,960
Documents Incorporated by Reference
Portions of the registrant’s definitive proxy statement for its 2020 annual meeting of stockholders are incorporated by reference in Part III of this Annual Report on Form 10-K
    
Amendment Flag false    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Entity Central Index Key 0001690680    
Current Fiscal Year End Date --12-31    
Class A Common Stock      
Document Information [Line Items]      
Entity Common Stock, Shares Outstanding   156,118,828  
Class B Common Stock      
Document Information [Line Items]      
Entity Common Stock, Shares Outstanding   21,285,533