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Revenue - Summary of Changes in Deferred Revenue (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2021 USD ($)
Change in Contract with Customer, Liability [Roll Forward]
Deferred revenue, beginning balance	$ 129,413
Deferral of revenue	67,734
Recognition of deferred revenue	(67,134)
Foreign currency translation	14
Deferred revenue, ending balance	$ 130,027

X

- Definition

Change in Contract with Customer, Liability [Roll Forward]

+ References

No definition available.

+ Details

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Namespace Prefix:	aciw_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- 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

Name:	aciw_ContractWithCustomerLiabilityAdditions
Namespace Prefix:	aciw_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of increase (decrease) in Contract With Customer Liability Foreign Currency Translation.

+ References

No definition available.

+ Details

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Namespace Prefix:	aciw_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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X

- 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_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- 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=121556615&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=121604090&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=121556615&loc=SL49130532-203044

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Balance Type:	credit
Period Type:	instant