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Condensed Consolidated Financial Statements - Changes in Carrying Amount of Goodwill (Parenthetical) (Detail) | 9 Months Ended
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Sep. 30, 2016
Maximum |
Goodwill [Line Items] |
Preliminary purchase price allocation period | 1 year

X
- Definition Maximum purchase price allocation period. + References No definition available. + Details
Name: | aciw_PreliminaryPurchasePriceAllocationPeriod
Namespace Prefix: | aciw_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_GoodwillLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |