v3.25.1
Cover - shares
 3 Months Ended
Mar. 31, 2025
Apr. 30, 2025
Document Information [Line Items]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Mar. 31, 2025  
Document Transition Report false  
Entity File Number 001-37879  
Entity Registrant Name TRADE DESK, INC.  
Entity Incorporation, State or Country Code NV  
Entity Tax Identification Number 27-1887399  
Entity Address, Address Line One 42 N. Chestnut Street  
Entity Address, City or Town Ventura  
Entity Address, State or Province CA  
Entity Address, Postal Zip Code 93001  
City Area Code 805  
Local Phone Number 585-3434  
Title of 12(b) Security Class A Common Stock, par value $0.000001 per share  
Trading Symbol TTD  
Security Exchange Name NASDAQ  
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 Central Index Key 0001671933  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2025  
Document Fiscal Period Focus Q1  
Amendment Flag false  
Class A common stock    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   448,135,991
Class B common stock    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   43,302,678