v3.25.2
Cover Page - shares
6 Months Ended
Jun. 30, 2025
Jul. 30, 2025
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2025  
Document Transition Report false  
Entity File Number 001-40291  
Entity Registrant Name COMPASS, INC.  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 30-0751604  
Entity Address, Address Line One 110 Fifth Avenue, 4th Floor  
Entity Address, City or Town New York  
Entity Address, State or Province NY  
Entity Address, Postal Zip Code 10011  
City Area Code (646)  
Local Phone Number 982-0353  
Title of 12(g) Security Class A Common Stock, $0.00001 par value per share  
Trading Symbol COMP  
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  
Entity Common Stock, Shares Outstanding   525,865,413
Amendment Flag false  
Document Fiscal Year Focus 2025  
Document Fiscal Period Focus Q2  
Entity Central Index Key 0001563190  
Current Fiscal Year End Date --12-31