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Discontinued operations - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Share-based compensation expense $ 2,954 $ 2,614   $ 5,229 $ 24,975
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]          
Share-based compensation expense     2,299    
Common Stock Grants | Red Violet, Inc. | Transaction Grants          
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)     2,041,000 644,419  
Discontinued Operations, Disposed of | Red Violet, Inc.          
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