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Condensed Consolidated Financial Statements - Additional Information (Detail) - USD ($) $ in Millions | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Summary Of Significant Accounting Policies [Line Items] |  |
Amount of off balance sheet settlement funds | $ 254.7 | $ 270.0
Level 2 [Member] |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Fair value senior note | $ 308.3 | $ 309.8

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- Definition The balance of the settlement funds at period end. Settlement funds are trust accounts maintained for the benefit of the Company's clients. They are not included in the Company's balance sheet. + References No definition available. + Details
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Namespace Prefix: | aciw_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Summary Of Significant Accounting Policies [Line Items] + References No definition available. + Details
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Namespace Prefix: | aciw_
Data Type: | xbrli:stringItemType
Balance Type: | na
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |