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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, 2019 | Dec. 31, 2018
Goodwill [Line Items] |  |
Goodwill, gross amount prior to period |  | $ 957,123
Goodwill, total impairment prior to period |  | (47,432)
Goodwill [Roll Forward] |  |
Goodwill, beginning of period | $ 909,691 |
Goodwill from acquisitions | 368,574 |
Goodwill, end of period | 1,278,265 |
ACI On Demand |  |
Goodwill [Line Items] |  |
Goodwill, gross amount prior to period |  | 183,783
Goodwill, total impairment prior to period |  | 0
Goodwill [Roll Forward] |  |
Goodwill, beginning of period | 183,783 |
Goodwill from acquisitions | 368,574 |
Goodwill, end of period | 552,357 |
ACI On Premise |  |
Goodwill [Line Items] |  |
Goodwill, gross amount prior to period |  | 773,340
Goodwill, total impairment prior to 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 before 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 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 + Details
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