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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
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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.

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