XML 42 R30.htm IDEA: XBRL DOCUMENT v3.8.0.1
Discontinued operations - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 26, 2018
Mar. 31, 2018
Mar. 31, 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   22,361 $ 7,312
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