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Commitments and Contingencies - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Jul. 22, 2017
Jun. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Commitments And Contingencies [Line Items]          
Rental expenses     $ 1,728 $ 1,378 $ 365
Data cost incurred     4,280 $ 3,200 $ 924
Capital commitment under certain data licensing agreements, Total     23,247    
Litigation settlement expense   $ 7,000      
Accrued Expenses and Other Current Liabilities [Member]          
Commitments And Contingencies [Line Items]          
Litigation settlement expense     $ 4,000    
TransUnion Risk and Alternative Data Solutions, Inc [Member]          
Commitments And Contingencies [Line Items]          
Litigation settlement, amount awarded to other party $ 7,000        
Loss contingency, settlement agreement, terms     Company subsidiary, IDI Holdings, will pay $7,000 to TRADS over the course of one year to settle all these matters (the “TRADS Litigation Settlement”).