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Contingencies (Detail) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Loss Contingencies [Line Items] |  |  |  |  |  |
Provision for income taxes | $ (32,100,000) |  | $ (24,200,000) | $ (77,300,000) | $ (64,200,000) |
Ramirez v. Trans Union LLC [Member] | Judicial Ruling [Member] | Punitive Damages [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Loss Contingency, Damages Awarded, Value |  | $ 32,000,000.0 |  |  |  | $ 52,000,000.0
Loss Contingency, Loss in Period |  | 30,500,000 |  |  |  |
Provision for income taxes |  | 7,600,000 |  |  |  |
Per person [Member] | Ramirez v. Trans Union LLC [Member] | Judicial Ruling [Member] | Punitive Damages [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Loss Contingency, Damages Awarded, Value |  | $ 3,936.88 |  |  |  | $ 6,353.08

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