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Nature of Business and Summary of Significant Accounting Policies - Summary of Changes in the Carrying Amount of Goodwill (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Goodwill [Line Items] |  |  |
Gross Balance, prior to beginning of period |  |  | $ 957,123
Total impairment prior to beginning of period |  |  | (47,432)
Goodwill [Roll Forward] |  |  |
Balance, beginning of period | $ 1,280,525 | $ 909,691 |
Goodwill from acquisitions |  | 370,834 |
Goodwill from acquisitions, subsequent adjustment | (299) |  |
Balance, end of period | 1,280,226 | 1,280,525 |
ACI On Demand |  |  |
Goodwill [Line Items] |  |  |
Gross Balance, prior to beginning of period |  |  | 183,783
Total impairment prior to beginning of period |  |  | 0
Goodwill [Roll Forward] |  |  |
Balance, beginning of period | 554,617 | 183,783 |
Goodwill from acquisitions |  | 370,834 |
Goodwill from acquisitions, subsequent adjustment | (299) |  |
Balance, end of period | 554,318 | 554,617 |
ACI On Premise |  |  |
Goodwill [Line Items] |  |  |
Gross Balance, prior to beginning of period |  |  | 773,340
Total impairment prior to beginning of period |  |  | $ (47,432)
Goodwill [Roll Forward] |  |  |
Balance, beginning of period | 725,908 | 725,908 |
Goodwill from acquisitions |  | 0 |
Goodwill from acquisitions, subsequent adjustment | 0 |  |
Balance, end of period | $ 725,908 | $ 725,908 |

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