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Income Taxes - Additional Information (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]      
Federal statutory rate 21.00% 35.00% [1]  
Tax cuts and jobs act of 2017 change in tax rate provisional income tax expense (benefit)   $ 80,300,000  
Tax effect of pre-Separation earnings [1]   (16,210,000)  
Write-off of permanent outside basis difference resulting from change in tax status [1]   50,687,000  
Effect of U.S. federal tax rate change [1]   80,298,000  
Deferred income tax liabilities, Net   246,000,000  
Unrecognized tax benefits   $ 0 $ 0
[1] The income tax benefit for the year ended December 31, 2017 is based upon seven months of Cars.com, LLC activity and twelve months of DealerRater activity.