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Condensed Consolidated Financial Statements - Summary of Changes in the Carrying Amount of Goodwill (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2020 | Dec. 31, 2019
Goodwill [Line Items] |  |
Goodwill, gross amount prior to beginning of period |  | $ 1,327,957
Goodwill, total impairment prior to beginning of period |  | (47,432)
Goodwill [Roll Forward] |  |
Goodwill, beginning of period | $ 1,280,525 |
Goodwill from acquisitions | (299) |
Goodwill, end of period | 1,280,226 |
ACI On Demand |  |
Goodwill [Line Items] |  |
Goodwill, gross amount prior to beginning of period |  | 554,617
Goodwill, total impairment prior to beginning of period |  | 0
Goodwill [Roll Forward] |  |
Goodwill, beginning of period | 554,617 |
Goodwill from acquisitions | (299) |
Goodwill, end of period | 554,318 |
ACI On Premise |  |
Goodwill [Line Items] |  |
Goodwill, gross amount prior to beginning of period |  | 773,340
Goodwill, total impairment prior to beginning of period |  | $ (47,432)
Goodwill [Roll Forward] |  |
Goodwill, beginning of period | 725,908 |
Goodwill from acquisitions | 0 |
Goodwill, end of period | $ 725,908 |

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(10)(1)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=120320667&loc=SL49117168-202975 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 + Details
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