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Discontinued Operations - Narrative (Details) $ in Millions |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jul. 31, 2017 USD ($) seat | Sep. 30, 2018 USD ($) | Sep. 30, 2018 USD ($) | May 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Conversion ratio for every share of Tegna common stock owned by stockholders |  |  |  | 0.3333
Tax benefit from discontinued operations |  | $ 4.3 |  |
CareerBuilder |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Proceeds from sale of discontinued operation | $ 198.3 |  |  |
CareerBuilder |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Equity method investment retained after disposal, ownership interest (as a percent) | 17.00% |  | 17.00% |
Equity method investment retained after disposal, fully diluted ownership interest (as a percent) | 10.00% |  | 10.00% |
Number seats retained on Board of Directors after sale | seat | 2 |  |  |
Total number of seats on Board of Directors | seat | 10 |  |  |
Equity income (loss) in unconsolidated investments, net |  |  | $ 15.7 |

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