XML 13 R1.htm IDEA: XBRL DOCUMENT v3.24.3
Cover Page - shares
 9 Months Ended
Sep. 30, 2024
Oct. 28, 2024
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Sep. 30, 2024  
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 212  
Local Phone Number 913-9058  
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   510,307,191
Amendment Flag false  
Document Fiscal Year Focus 2024  
Document Fiscal Period Focus Q3  
Entity Central Index Key 0001563190  
Current Fiscal Year End Date --12-31