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Income Taxes - Schedule of Income Tax Provision Differed from Amounts Computed at the Statutory Federal Income Tax Rate (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
 [2]
Income Tax Disclosure [Abstract]      
Income tax provision at statutory rate $ 11,955 $ 42,757 [1] $ 521
Tax effect of pre-Separation earnings [1]   (16,210)  
State income taxes, net of federal income tax benefit 2,668 2,294 [1] 67
Effect of change in apportionment factors [3] 3,467    
Write-off of permanent outside basis difference [1]   (50,687)  
Effect of U.S. federal tax rate change [1]   (80,298)  
Other, net 30 (137) [1]  
Income tax expense (benefit) $ 18,120 $ (102,281) [1] $ 588
Federal statutory rate 21.00% 35.00% [1]  
Tax effect of pre-Separation earnings, percent [1]   (13.30%)  
State income taxes, net of federal income tax benefit, percent 4.70% 1.90% [1]  
Effect of change in apportionment factors, percent [3] 6.10%    
Write-off of permanent outside basis difference, percent [1]   (41.50%)  
Effect of U.S. federal tax rate change, percent [1]   (65.70%)  
Other, net, percent [1]   (0.10%)  
Income tax expense (benefit), percent 31.80% (83.70%) [1]  
[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.
[2] As a partnership, Cars.com, LLC generally was not subject to federal and state income tax. Therefore, the income tax benefit is based upon five months of DealerRater post-acquisition activity.
[3] This item relates to changes in apportionment factors upon the finalization of the post-Spin 2017 state tax returns in the fourth quarter of 2018.