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Segment information - Additional Information (Detail) - Segment
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Revenue [Member] | Outside of United States [Member] | Maximum [Member]    
Segment Reporting Information [Line Items]    
Revenue 10.00% 10.00%
Prior to Spin-off of Red Violet [Member]    
Segment Reporting Information [Line Items]    
Number of reportable segments 2  
After Spin-off of Red Violet [Member]    
Segment Reporting Information [Line Items]    
Number of reportable segments 1