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Discontinued operations - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Loss on disposal of discontinued operations   $ 19,040
Loss on disposal of discontinued operations, non-cash charges   16,030
Share-based compensation expense $ 2,275 $ 22,361
Red Violet, Inc.    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Spinoff transaction costs 7,708  
Red Violet, Inc. | Spin-off Transaction Costs    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Non-cash share-based compensation expense $ 5,409  
Share vested not delivered (in shares) 2,041,000  
Share-based compensation expense $ 2,299