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Condensed Consolidated Financial Statements - Additional Information (Details) $ in Thousands | 1 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jul. 31, 2019 USD ($) | Sep. 30, 2021 USD ($) reportingUnit | Dec. 31, 2020 USD ($)
Condensed Financial Statements, Captions [Line Items] |  |  |
Right-of-use assets |  | $ 49,438 | $ 41,243
Amount of off balance sheet settlement funds |  | 196,000 | 246,800
Goodwill |  | $ 1,280,226 | 1,280,226
Number of reporting units | reportingUnit |  | 2 |
India payment technology and services company |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Payments to acquire investment interest | $ 18,300 |  |
Percentage of voting interests acquired | 30.00% |  |
Equity method investment, amount recorded |  | $ 19,000 | 19,300
ACI On Demand |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Goodwill |  | 554,300 |
ACI On Premise |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Goodwill |  | $ 725,900 |
Level 2 | Senior Notes | 5.750% Senior Notes due 2026 |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Stated interest rate (percentage) |  | 5.75% |
Fair value of long-term debt |  | $ 420,000 | $ 424,500
Corporate Headquarters |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Right-of-use assets |  | 12,900 |
Operating lease liability |  | $ 15,200 |

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