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Business Combination - Additional Information (Details) - USD ($) $ in Thousands, shares in Millions |  | 10 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Feb. 21, 2018 | Dec. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Business Acquisition [Line Items] |  |  |  |  |
Revenue targets for stock-based compensation awards performance period |  |  | 3 years |  |
Goodwill |  | $ 884,449 | $ 884,449 | $ 788,107 | $ 788,107
Dealer Inspire ("DI") and Launch Digital Marketing (“LDM”) |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Total acquisition costs incurred | $ 4,900 |  |  |  |
Total acquisition costs recorded |  |  | 4,300 |  |
Cash settlement of DI's unvested equity awards | $ 5,700 |  |  |  |
Purchase price allocation, preliminary fair values measurement period | 1 year |  |  |  |
Business acquisition, total consideration | $ 160,833 |  |  |  |
Goodwill | 96,342 |  |  |  |
Business acquisition, Goodwill expected income tax deductible amount | $ 15,000 |  |  |  |
Revenues |  | 53,100 | 669,798 | 668,447 |
Net income (loss) |  | $ (11,300) | 46,111 | $ 211,779 |
Pre tax incremental intangible assets amortization expense |  |  | 14,000 |  |
Pre tax cash settlement of unvested equity awards |  |  | $ 8,200 |  |
Dealer Inspire ("DI") and Launch Digital Marketing (“LDM”) | Maximum |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Stock-based compensation awards granted | 25.5 |  |  |  |

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- Definition Amount of direct costs of the business combination including legal, accounting, and other costs incurred to consummate the business acquisition. + References No definition available. + Details
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