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Discontinued operations - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 26, 2018
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]            
Net assets of red violet as a deduction in additional paid-in capital         $ 41,500  
Loss on disposal of discontinued operations         19,040  
Loss on disposal of discontinued operations, non-cash charges         16,030  
Share-based compensation expense   $ 2,614   $ 9,319 $ 24,975 $ 16,631
Red Violet, Inc. [Member]            
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]            
Net assets of red violet as a deduction in additional paid-in capital $ 41,500          
Spinoff transaction costs     $ 7,708      
Red Violet, Inc. [Member] | Spin-off Transaction Costs [Member]            
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     2,041,000      
Share-based compensation expense     $ 2,299