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Condensed Consolidated Financial Statements - Additional Information (Detail) - USD ($) $ in Millions | Sep. 30, 2015 | Dec. 31, 2014
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Accounting Policies [Abstract] |  |
Amount of off balance sheet settlement funds | $ 216.2 | $ 224.9

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- Definition The balance of the settlement accounts at period end. Settlement accounts 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
Name: | aciw_SettlementAccountsBalance
Namespace Prefix: | aciw_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration