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Business Combination - Additional Information (Details) - USD ($)
$ in Thousands
 10 Months Ended 12 Months Ended 23 Months Ended
Feb. 21, 2018
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2017
Business Acquisition [Line Items]            
Revenue targets for stock-based compensation awards performance period     3 years      
Goodwill   $ 884,449 $ 505,885 $ 884,449 $ 505,885 $ 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          
Business acquisition, total consideration 160,833          
Goodwill 96,342          
Business acquisition, Goodwill expected income tax deductible amount 15,000          
Revenue   669,800     53,100  
Net income (loss)   $ 46,100     $ (11,300)  
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 $ 25,500