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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”). |  |

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- Definition Line items represent commitment and contingencies. + References No definition available. + Details
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- Definition Description of the terms of a settlement agreement which resolved the legal matter, including the nature of the consideration, timing of payment, and the nature of rights obtained or lost (for example, but not limited to, patent, trademark, copyright, license and franchise rights). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14435-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14557-108349 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14326-108349 + Details
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