| Document and Entity Information | Nov. 14, 2024 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Nov. 14, 2024 |
| Entity Registrant Name | TRADE DESK, INC. |
| Entity Incorporation State Country Code | NV |
| Entity File Number | 001-37879 |
| Entity Tax Identification Number | 27-1887399 |
| Entity Address Address Line 1 | 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 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Class A Common Stock, par value $0.000001 per share |
| Trading Symbol | TTD |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0001671933 |
| Amendment Flag | false |
