| Cover Page - USD ($) $ in Millions | 12 Months Ended | ||
| Dec. 31, 2019 | Apr. 23, 2020 | Jun. 28, 2019 | |
| Cover page. | |||
| Document Type | 10-K/A | ||
| Document Annual Report | true | ||
| Document Period End Date | Dec. 31, 2019 | ||
| Document Transition Report | false | ||
| Entity File Number | 001-33520 | ||
| Entity Registrant Name | COMSCORE, INC. | ||
| Entity Incorporation, State or Country Code | DE | ||
| Entity Tax Identification Number | 54-1955550 | ||
| Entity Address, Address Line One | 11950 Democracy Drive, 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 | ||
| Title of 12(b) Security | Common Stock, par value $0.001 per share | ||
| Trading Symbol | SCOR | ||
| Security Exchange Name | NASDAQ | ||
| Entity Well-known Seasoned Issuer | No | ||
| Entity Voluntary Filers | No | ||
| Entity Current Reporting Status | Yes | ||
| Entity Interactive Data Current | Yes | ||
| Entity Filer Category | Accelerated Filer | ||
| Entity Small Business | false | ||
| Entity Emerging Growth Company | false | ||
| Entity Shell Company | false | ||
| Entity Public Float | $ 220.3 | ||
| Entity Common Stock, Shares Outstanding | 70,208,183 | ||
| Amendment Flag | true | ||
| Document Fiscal Year Focus | 2019 | ||
| Document Fiscal Period Focus | FY | ||
| Entity Central Index Key | 0001158172 | ||
| Current Fiscal Year End Date | --12-31 | ||
| Amendment Description | On February 28, 2020, comScore, Inc. (the “company,” “Comscore,” “we,” “us” or “our”) filed its Annual Report on Form 10-K for the fiscal year ended December 31, 2019 (the “Original 10-K”). This Amendment No. 1 (the “Amendment”) amends Part II, Item 9B of the Original 10-K to disclose the recent resignation of a member of the Company’s Board of Directors, and amends Part III, Items 10 through 14 of the Original 10-K to include information previously omitted from the Original 10-K in reliance on General Instruction G(3) to Form 10-K. General Instruction G(3) to Form 10-K provides that registrants may incorporate by reference certain information from a definitive proxy statement which involves the election of directors if such definitive proxy statement is filed with the Securities and Exchange Commission (the “SEC”) within 120 days after the end of the fiscal year. We do not anticipate that our definitive proxy statement involving the election of directors will be filed before April 29, 2020 (i.e., within 120 days after the end of our 2019 fiscal year). Accordingly, Part III of the Original 10-K is hereby amended and restated as set forth below. The information included herein as required by Part III, Items 10 through 14 of Form 10-K is more limited than what is required to be included in the definitive proxy statement to be filed in connection with our annual meeting of shareholders. In addition, as required by Rule 12b-15 under the Securities Exchange Act of 1934, as amended (the “Exchange Act”), new certifications by our principal executive officer and principal financial officer are filed as exhibits to this Amendment under Item 15 of Part IV hereof. Except as stated herein, this Amendment does not reflect events occurring after the filing of the Original 10-K with the SEC on February 28, 2020 and no attempt has been made in this Amendment to modify or update other disclosures as presented in the Original 10-K. |
