| Document and Entity Information | Sep. 10, 2020 |
| Cover [Abstract] | |
| Amendment Flag | false |
| Entity Central Index Key | 0001158172 |
| Document Type | 8-K |
| Document Period End Date | Sep. 10, 2020 |
| Entity Registrant Name | comScore, Inc. |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 001-33520 |
| Entity Tax Identification Number | 54-1955550 |
| Entity Address, Address Line One | 11950 Democracy Drive |
| Entity Address, Address Line Two | Suite 600 |
| Entity Address, City or Town | Reston |
| Entity Address, State or Province | VA |
| Entity Address, Postal Zip Code | 20190 |
| City Area Code | (703) |
| Local Phone Number | 438-2000 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Common Stock, par value $0.001 per share |
| Trading Symbol | SCOR |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
