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Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2021
Jan. 31, 2022
Jun. 30, 2021
Document Information [Line Items]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2021    
Document Fiscal Year Focus 2021    
Document Fiscal Period Focus FY    
Trading Symbol TTD    
Entity Registrant Name TRADE DESK, INC.    
Entity Central Index Key 0001671933    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer Yes    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Public Float     $ 33,366,438,121
Entity Interactive Data Current Yes    
Entity Shell Company false    
Entity File Number 001-37879    
Entity Incorporation, State or Country Code DE    
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    
Security Exchange Name NASDAQ    
ICFR Auditor Attestation Flag true    
Document Annual Report true    
Document Transition Report false    
Auditor Firm ID 238    
Auditor Name PricewaterhouseCoopers LLP    
Auditor Location Los Angeles, California    
Documents Incorporated by Reference

DOCUMENTS INCORPORATED BY REFERENCE

Portions of the registrant’s Proxy Statement for the 2022 Annual Meeting of Stockholders are incorporated by reference in Part III of this Annual Report on Form 10-K to the extent stated herein. Such proxy statement will be filed with the Securities and Exchange Commission within 120 days of the registrant’s fiscal year ended December 31, 2021.

 

    
Class A common stock      
Document Information [Line Items]      
Entity Common Stock, Shares Outstanding   440,597,630  
Class B common stock      
Document Information [Line Items]      
Entity Common Stock, Shares Outstanding   44,234,950