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Goodwill - Additional Information (Detail) - USD ($)
6 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Goodwill [Line Items]    
Goodwill $ 159,791,000 $ 159,791,000
Impairment of goodwill 0  
Spin-off of Red Violet [Member]    
Goodwill [Line Items]    
Derecognized goodwill 6,465,000  
Interactive Data LLC, Fluent, LLC and Q Interactive, LLC Acquisitions [Member] | Prior to Spin-off of Red Violet [Member]    
Goodwill [Line Items]    
Goodwill $ 166,256,000