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Document and Entity Information
Oct. 30, 2019
Cover [Abstract]  
Document Type 8-K
Amendment Flag false
Document Period End Date Oct. 30, 2019
Entity Registrant Name Newmark Group, Inc.
Entity Central Index Key 0001690680
Entity Emerging Growth Company false
Entity File Number 001-38329
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
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Title of each class Class A Common Stock, $0.01 par value
Trading Symbol NMRK
Security Exchange Name NASDAQ