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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