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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.

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