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Changes in Alliance Agreement Liability (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Dec. 31, 2007
Alliance Agreement [Line Items] |  |  |  |
Beginning balance | $ 22,584 | $ 32,487 |  | $ 9,300
Costs related to fulfillment of technical enablement milestones | (1,917) | (9,903) | (11,000) |
Ending balance | $ 20,667 | $ 22,584 | $ 32,487 | $ 9,300

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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. + References No definition available. + Details
Name: | aciw_AllianceAgreementLiability
Namespace Prefix: | aciw_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | aciw_AllianceAgreementLineItems
Namespace Prefix: | aciw_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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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. + References No definition available. + Details
Name: | aciw_CostsRelatedToFulfillmentOfTechnicalEnablementMilestones
Namespace Prefix: | aciw_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration