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Income Taxes - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Income Tax Disclosure [Line Items]        
Provision for income taxes $ 13,019 $ 452 $ 15,782 $ 452
Effective tax rate 38.30%   17.80%  
Deferred income tax liabilities, Net $ 267,000   $ 267,000  
Write-off deferred tax liability associated with non-deductible goodwill     $ 69,000  
DealerRater        
Income Tax Disclosure [Line Items]        
Date of acquisition     Aug. 01, 2016  
DealerRater | TEGNA's        
Income Tax Disclosure [Line Items]        
Deferred income tax assets, Net $ 8,000   $ 8,000