| Document and Entity Information | Jan. 26, 2023 |
| Document And Entity Information [Line Items] | |
| Amendment Flag | false |
| Entity Central Index Key | 0001838672 |
| Document Type | 8-K |
| Document Period End Date | Jan. 26, 2023 |
| Entity Registrant Name | AdTheorent Holding Company, Inc. |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 001-40116 |
| Entity Tax Identification Number | 85-3978415 |
| Entity Address, Address Line One | 330 Hudson Street |
| Entity Address, Address Line Two | 13th Floor |
| Entity Address, City or Town | New York |
| Entity Address, State or Province | NY |
| Entity Address, Postal Zip Code | 10013 |
| City Area Code | (800) |
| Local Phone Number | 804-1359 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | false |
| Common Stock Par Value 0.0001 Per Share 2 [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | Common stock, par value $0.0001 per share |
| Trading Symbol | ADTH |
| Security Exchange Name | NASDAQ |
| Warrants To Purchase Common Stock 1 [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | Warrants to purchase common stock |
| Trading Symbol | ADTHW |
| Security Exchange Name | NASDAQ |
