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Changes in the Alliance Agreement Liability (Detail) (USD $) In Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2010 | Sep. 30, 2011 | Sep. 30, 2010
Accounts Payable and Accrued Liabilities [Line Items] |  |  |
Beginning Balance |  | $ 22,584 |
Costs related to fulfillment of technical enablement milestones | (2,200) | (317) | (7,600)
Ending Balance |  | $ 22,267 |

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- Definition Accounts Payable and Accrued Liabilities [Line Items] + Details
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Namespace Prefix: | aciw
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The liability recorded for funds received by the Company from International Business Machines under the Master Alliance Agreement. This liabilies relates to funding for technical enablement milestones, prepaid incentives and other obligations. + Details
Name: | aciw_AllianceAgreementLiability
Namespace Prefix: | aciw
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Costs related to fulfillment of technical enablement milestones under the Master Alliance Agreement with International Business Machines. The costs are expensed as incurred prior to reaching technological feasibility and capitalized after. + Details
Name: | aciw_CostsRelatedToFulfillmentOfTechnicalEnablementMilestones
Namespace Prefix: | aciw
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration