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Revenue - Summary of Changes in Deferred Revenue (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Change in Contract with Customer, Liability [Roll Forward] |  |
Deferred revenue, beginning balance | $ 129,413 | $ 118,939
Deferral of revenue | 154,419 | 149,363
Recognition of deferred revenue | (171,530) | (141,313)
Foreign currency translation | (1,952) | 2,424
Deferred revenue, ending balance | $ 110,350 | $ 129,413

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- Definition Amount of revenue deferred in the current period for which consideration has been received or is receivable and an obligation exists to transfer goods or services to the customer. + References No definition available. + Details
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Namespace Prefix: | aciw_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Amount of increase (decrease) in contract with customer liability foreign currency translation. + References No definition available. + Details
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- Definition Amount of revenue recognized previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due. + References No definition available. + Details
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Namespace Prefix: | aciw_
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- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=123360276&loc=SL49130531-203044 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130549-203045 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=123360276&loc=SL49130532-203044 + Details
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