v3.25.1
Cover - USD ($)
$ in Billions
 12 Months Ended
Dec. 31, 2024
Apr. 25, 2025
Jun. 30, 2024
Document Information [Line Items]      
Document Type 10-K/A    
Document Annual Report true    
Document Transition Report false    
Document Financial Statement Error Correction [Flag] false    
Entity Interactive Data Current Yes    
ICFR Auditor Attestation Flag true    
Amendment Flag true    
Amendment Description Throughout this document Newmark Group, Inc. is referred to as “Newmark,” and, together with its subsidiaries, as the “Company,” “we,” “us,” or “our.” On March 3, 2025, Newmark filed its Annual Report on Form 10-K for the fiscal year ended December 31, 2024 (the “Original Form 10-K”). Certain Part III information was omitted from the Original Form 10-K in reliance on General Instruction G(3) to Form 10-K. General Instruction G(3) to Form 10-K provides that registrants may incorporate by reference certain information from a definitive proxy statement which involves the election of directors if such definitive proxy statement is filed with the Securities and Exchange Commission (the “SEC”) within 120 days after the end of the fiscal year. The Company does not anticipate that its definitive proxy statement involving the election of directors in connection with its 2025 annual meeting of stockholders will be filed by April 30, 2025 (i.e., within 120 days after the end of the Company’s 2024 fiscal year). Accordingly, this Amendment No. 1 (this “Amendment”) hereby amends and restates Part III, Items 10 through 14 of the Original Form 10-K as set forth below. The information included herein as required by Part III, Items 10 through 14 of the Original Form 10-K is more limited than what is required to be included in the definitive proxy statement to be filed in connection with our 2025 annual meeting of stockholders. Accordingly, the definitive proxy statement to be filed at a later date will include additional information related to the topics herein and additional information not required by Part III, Items 10 through 14 of Form 10-K.This Amendment also restates Item 15 of Part IV of the Original Form 10-K. In addition, as required by Rule 12b-15 under the Securities Exchange Act of 1934, as amended (the “Exchange Act”), new certifications by our principal executive officer and principal financial officer are filed as exhibits to this Amendment under Item 15 of Part IV hereof.No other amendments are being made hereby to the Original Form 10-K. Except as stated herein, this Amendment does not reflect events occurring after the filing of the Original Form 10-K with the SEC on March 3, 2025, and no attempt has been made in this Amendment to modify or update other disclosures as presented in the Original Form 10-K. Terms used but not defined herein have the meanings given to them in the Original Form 10-K.    
Document Period End Date Dec. 31, 2024    
Document Fiscal Year Focus 2024    
Document Fiscal Period Focus FY    
Entity Information [Line Items]      
Entity Registrant Name NEWMARK GROUP, INC.    
Entity Central Index Key 0001690680    
Entity File Number 001-38329    
Entity Tax Identification Number 81-4467492    
Entity Incorporation, State or Country Code DE    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Shell Company false    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Public Float     $ 1.3
Entity Contact Personnel [Line Items]      
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    
Entity Phone Fax Numbers [Line Items]      
City Area Code (212)    
Local Phone Number 372-2000    
Entity Listings [Line Items]      
Title of 12(b) Security Class A Common Stock, $0.01 par value    
Trading Symbol NMRK    
Security Exchange Name NASDAQ    
Class A Common Stock      
Entity Listings [Line Items]      
Entity Common Stock, Shares Outstanding   163,201,394  
Class B Common Stock      
Entity Listings [Line Items]      
Entity Common Stock, Shares Outstanding   21,285,533