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Income taxes - Schedule of Components of Deferred Tax Assets and Liabilities (Parenthetical) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Income Taxes [Line Items] |  |  |
Deferred tax assets |  | $ 14,653 | $ 28,109
Litigation settlement expense | $ 7,000 |  |
Accrued Expenses and Other Current Liabilities [Member] |  |  |
Income Taxes [Line Items] |  |  |
Litigation settlement expense |  | 4,000 |
Accrued Expenses and Other Current Liabilities [Member] | TransUnion Risk and Alternative Data Solutions, Inc [Member] |  |  |
Income Taxes [Line Items] |  |  |
Deferred tax assets |  | $ 1,037 |

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- Definition Income taxes. + References No definition available. + Details
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- Definition Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b),(c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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- Definition Amount of litigation expense, including but not limited to legal, forensic, accounting, and investigative fees. + References No definition available. + Details
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- Details
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- Details
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