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Commitments and Contingencies - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jul. 22, 2017
Sep. 30, 2017
Jun. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Commitments and Contingencies [Line Items]            
Data cost incurred   $ 1,179   $ 874 $ 3,400 $ 2,757
Capital commitment under non-cancellable data licensing agreements, Total   $ 24,321     24,321  
Litigation settlement expense     $ 7,000      
Accrued Expenses and Other Current Liabilities [Member]            
Commitments and Contingencies [Line Items]            
Litigation settlement expense         $ 5,000  
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, LLC (“IDI Holdings”), will pay $7,000 to TRADS over the course of one year to settle all matters (the “TRADS Litigation Settlement”).