Quarterly report pursuant to Section 13 or 15(d)

Cover Page

Cover Page - $ / shares
9 Months Ended
Sep. 30, 2023
Oct. 31, 2023
Dec. 31, 2022
Cover [Abstract]      
Document Type 10-Q    
Document Quarterly Report true    
Document Period End Date Sep. 30, 2023    
Document Transition Report false    
Entity File Number 001-36155    
Entity Registrant Name MARCUS & MILLICHAP, INC.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 35-2478370    
Entity Address, Address Line One 23975 Park Sorrento, Suite 400    
Entity Address, City or Town Calabasas    
Entity Address, State or Province CA    
Entity Address, Postal Zip Code 91302    
City Area Code 818    
Local Phone Number 212-2250    
Title of 12(b) Security Common Stock, par value $0.0001 per share    
Trading Symbol MMI    
Security Exchange Name NYSE    
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    
Preferred stock, par value (in dollars per share) $ 0.0001   $ 0.0001
Entity Common Stock, Shares Outstanding   38,384,569  
Entity Central Index Key 0001578732    
Current Fiscal Year End Date --12-31    
Document Fiscal Period Focus Q3    
Document Fiscal Year Focus 2023    
Amendment Flag false