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Condensed Consolidated Financial Statements - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Amount of settlement funds	$ 200.2

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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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- Details

Name:	us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration