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Business Combination - Selected Unaudited Pro Forma Information (Details) - Dealer Inspire ("DI") and Launch Digital Marketing (“LDM”) - USD ($) $ in Thousands | 10 Months Ended | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Business Acquisition Pro Forma Information [Line Items] |  |  |
Revenues | $ 53,100 | $ 669,798 | $ 668,447
Net income | $ (11,300) | $ 46,111 | $ 211,779

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- Definition The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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