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Stock-Based Compensation Plans - Additional Information (Detail) (USD $) | 0 Months Ended | 12 Months Ended | 1 Months Ended | 3 Months Ended |
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Jul. 24, 2007 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2014 | Jun. 14, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Shares issued under ESPP |  | 154,223 us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans | 128,568 us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans | 122,394 us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans |  |  |  |  |
Stock-based compensation expense |  | $ 11,045,000 us-gaap_ShareBasedCompensation | $ 13,572,000 us-gaap_ShareBasedCompensation | $ 15,186,000 us-gaap_ShareBasedCompensation |  |  |  |  |
Employee stock purchase plan, amended plan start date | May 01, 2008 |  |  |  |  |  |  |  |
Employee stock purchase plan, amended plan end date | Apr. 30, 2018 |  |  |  |  |  |  |  |
Employee stock purchase plan term | 10 years |  |  |  |  |  |  |  |
Term of outstanding options |  | 5 years 8 months 19 days |  |  |  |  |  |  |
Incentive plan, percentage of options expected to vest over the vesting period |  | 93.20%aciw_ShareBasedCompensationArrangementsStockOptionsExpectedToVest |  |  | 93.20%aciw_ShareBasedCompensationArrangementsStockOptionsExpectedToVest |  |  | 93.20%aciw_ShareBasedCompensationArrangementsStockOptionsExpectedToVest |
Incentive plan, weighted-average grant date fair value of stock options granted |  | $ 9.02 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue | $ 8.72 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue | $ 6.85 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue |  |  |  |  |
Incentive plan, total intrinsic value of stock options exercised |  | 22,800,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue | 25,500,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue | 17,300,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue |  |  |  |  |
Dividend yield |  | 0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate | 0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate | 0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate |  |  |  |  |
Dividend paid |  | $ 0 us-gaap_CommonStockDividendsPerShareCashPaid |  |  |  |  |  |  |
Stock-based compensation expenses tax benefits |  | 4,200,000 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense | 5,200,000 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense | 5,500,000 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense |  |  |  |  |
Proceeds from exercises of stock options |  | 16,461,000 us-gaap_ProceedsFromStockOptionsExercised | 19,561,000 us-gaap_ProceedsFromStockOptionsExercised | 16,730,000 us-gaap_ProceedsFromStockOptionsExercised |  |  |  |  |
Actual tax benefit realized from tax deductions of option exercises |  | 8,600,000 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions | 9,700,000 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions | 6,300,000 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions |  |  |  |  |
2005 Stock Incentive Plan |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Number of shares authorized | 15,000,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_ShareRepurchaseProgramAxis = aciw_StockIncentivePlanTwentyZeroFiveMember |  |  |  |  |  |  |  | 23,250,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_ShareRepurchaseProgramAxis = aciw_StockIncentivePlanTwentyZeroFiveMember
Employee stock purchase plan term |  | 10 years |  |  |  |  |  |  |
Number of shares granted |  |  |  |  | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / us-gaap_ShareRepurchaseProgramAxis = aciw_StockIncentivePlanTwentyZeroFiveMember |  |  |  |
Shares of common stock reserved for issuance prior to amendment |  | 9,000,000 aciw_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorizedPriorToAmendment / us-gaap_ShareRepurchaseProgramAxis = aciw_StockIncentivePlanTwentyZeroFiveMember |  |  | 9,000,000 aciw_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorizedPriorToAmendment / us-gaap_ShareRepurchaseProgramAxis = aciw_StockIncentivePlanTwentyZeroFiveMember |  |  | 9,000,000 aciw_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorizedPriorToAmendment / us-gaap_ShareRepurchaseProgramAxis = aciw_StockIncentivePlanTwentyZeroFiveMember |
Restricted share awards (RSAs) |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Awards granted requisite service period |  | 3 years | 3 years | 3 years |  |  |  |  |
Restricted share awards, vesting increments on anniversary dates of grants |  | 33.00%aciw_RestrictedShareAwardsAnniversaryDateVestingPercentage / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 33.00%aciw_RestrictedShareAwardsAnniversaryDateVestingPercentage / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 33.00%aciw_RestrictedShareAwardsAnniversaryDateVestingPercentage / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |  |  |  |  |
Restricted shares awards, shares vested |  | 66,670 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 88,638 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 237,897 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |  |  |  |  |
Restricted shares withheld to pay employees' portion of minimum payroll withholding taxes |  | 26,461 us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 31,746 us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 71,439 us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |  |  |  |  |
Unrecognized compensation costs |  | 1,900,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |  |  | 1,900,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |  |  | 1,900,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |
Unrecognized compensation costs, weighted-average recognition periods |  | 10 months 24 days |  |  |  |  |  |  |
Restricted share awards (RSAs) | S1 Corporation |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Awards granted requisite service period |  | 4 years |  |  |  |  |  |  |
Restricted share awards, vesting increments on anniversary dates of grants |  | 25.00%aciw_RestrictedShareAwardsAnniversaryDateVestingPercentage / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_BusinessAcquisitionAxis = aciw_SOneCorporationMember |  |  |  |  |  |  |
Vesting percentage if employee is terminated without cause within 12 months from acquisition date |  | 100.00%aciw_ShareBasedCompensationArrangementTransactionRestrictedShareAwardsVestingWithinFirstYear / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_BusinessAcquisitionAxis = aciw_SOneCorporationMember |  |  | 100.00%aciw_ShareBasedCompensationArrangementTransactionRestrictedShareAwardsVestingWithinFirstYear / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_BusinessAcquisitionAxis = aciw_SOneCorporationMember |  |  | 100.00%aciw_ShareBasedCompensationArrangementTransactionRestrictedShareAwardsVestingWithinFirstYear / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_BusinessAcquisitionAxis = aciw_SOneCorporationMember |
Original grant date |  | Nov. 09, 2011 |  |  |  |  |  |  |
Restricted share awards (RSAs) | Minimum |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Awards granted requisite service period |  | 3 years |  |  |  |  |  |  |
Restricted share awards, vesting increments on anniversary dates of grants |  | 33.00%aciw_RestrictedShareAwardsAnniversaryDateVestingPercentage / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |  |  |  |
Restricted share awards (RSAs) | Maximum |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Awards granted requisite service period |  | 4 years |  |  |  |  |  |  |
Restricted share awards, vesting increments on anniversary dates of grants |  | 25.00%aciw_RestrictedShareAwardsAnniversaryDateVestingPercentage / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |  |  |  |
2010 Grant |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Expected attainment level for the awards granted, percentage |  |  |  |  |  | 136.00%aciw_ShareBasedCompensationArrangementsPerformanceSharesExpectedAttainment / us-gaap_AwardTypeAxis = aciw_StockBasedCompensationPlansTwentyTenGrantMember |  |  |
2010 Grant | Minimum |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Expected attainment level for the awards granted, percentage |  |  |  |  |  |  | 130.00%aciw_ShareBasedCompensationArrangementsPerformanceSharesExpectedAttainment / us-gaap_AwardTypeAxis = aciw_StockBasedCompensationPlansTwentyTenGrantMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
2010 Grant | Maximum |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Expected attainment level for the awards granted, percentage |  |  |  |  |  |  | 175.00%aciw_ShareBasedCompensationArrangementsPerformanceSharesExpectedAttainment / us-gaap_AwardTypeAxis = aciw_StockBasedCompensationPlansTwentyTenGrantMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
2012 Grant | Minimum |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Expected attainment level for the awards granted, percentage |  |  |  |  |  |  |  | 0.00%aciw_ShareBasedCompensationArrangementsPerformanceSharesExpectedAttainment / us-gaap_AwardTypeAxis = aciw_StockBasedCompensationPlansTwentyTwelveGrantMember / us-gaap_RangeAxis = us-gaap_MinimumMember |
2012 Grant | Maximum |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Expected attainment level for the awards granted, percentage |  |  |  |  |  |  |  | 100.00%aciw_ShareBasedCompensationArrangementsPerformanceSharesExpectedAttainment / us-gaap_AwardTypeAxis = aciw_StockBasedCompensationPlansTwentyTwelveGrantMember / us-gaap_RangeAxis = us-gaap_MaximumMember |
2013 Grant |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Expected attainment level for the awards granted, percentage |  |  |  |  |  |  |  | 75.00%aciw_ShareBasedCompensationArrangementsPerformanceSharesExpectedAttainment / us-gaap_AwardTypeAxis = aciw_StockBasedCompensationPlansTwentyThirteenGrantMember |
2011 Grant |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Expected attainment level for the awards granted, percentage |  | 100.00%aciw_ShareBasedCompensationArrangementsPerformanceSharesExpectedAttainment / us-gaap_AwardTypeAxis = aciw_StockBasedCompensationPlansTwentyElevenGrantMember |  |  |  |  |  |  |
Stock Options |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Unrecognized compensation costs |  | 6,700,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_EmployeeStockOptionMember |  |  | 6,700,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_EmployeeStockOptionMember |  |  | 6,700,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_EmployeeStockOptionMember |
Unrecognized compensation costs, weighted-average recognition periods |  | 1 year 8 months 12 days |  |  |  |  |  |  |
LTIP Performance Shares |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Unrecognized compensation costs |  | 6,700,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_OptionIndexedToIssuersEquityTypeAxis = aciw_LongTermIncentivePlansMember |  |  | 6,700,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_OptionIndexedToIssuersEquityTypeAxis = aciw_LongTermIncentivePlansMember |  |  | 6,700,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_OptionIndexedToIssuersEquityTypeAxis = aciw_LongTermIncentivePlansMember |
Unrecognized compensation costs, weighted-average recognition periods |  | 2 years |  |  |  |  |  |  |
Employee Stock Purchase Plan 1999 |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Number of shares authorized |  | 4,500,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_EmployeeStockMember |  |  | 4,500,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_EmployeeStockMember |  |  | 4,500,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_EmployeeStockMember |
Permitted designation for purchase of common stock under ESPP |  | Participating employees are permitted to designate up to the lesser of $25,000, or 10% of their annual base compensation, for the purchase of common stock under the ESPP. Purchases under the ESPP are made one calendar month after the end of each fiscal quarter. |  |  |  |  |  |  |
Employee participating annual base compensation designated for purchase of common stock, amount |  | 25,000 aciw_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumEmployeeSalaryDollars / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_EmployeeStockMember |  |  | 25,000 aciw_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumEmployeeSalaryDollars / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_EmployeeStockMember |  |  | 25,000 aciw_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumEmployeeSalaryDollars / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_EmployeeStockMember |
Employee participating annual base compensation designated for purchase of common stock, percent |  | 10.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumEmployeeSubscriptionRate / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_EmployeeStockMember |  |  | 10.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumEmployeeSubscriptionRate / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_EmployeeStockMember |  |  | 10.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumEmployeeSubscriptionRate / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_EmployeeStockMember |
Price of common stock purchased under ESPP, description |  | The price for shares of common stock purchased under the ESPP is 85% of the stock's fair market value on the last business day of the three-month participation period. |  |  |  |  |  |  |
Price of common stock purchased under ESPP, percent |  | 85.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_EmployeeStockMember |  |  |  |  |  |  |
Discount offered pursuant to ESPP, percentage |  | 15.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardDiscountFromMarketPriceOfferingDate / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_EmployeeStockMember |  |  |  |  |  |  |
Stock-based compensation expense |  | $ 500,000 us-gaap_ShareBasedCompensation / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_EmployeeStockMember | $ 300,000 us-gaap_ShareBasedCompensation / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_EmployeeStockMember | $ 200,000 us-gaap_ShareBasedCompensation / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_EmployeeStockMember |  |  |  |  |
2002 Non-Employee Director Stock Option Plan |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Number of shares authorized |  | 750,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = aciw_NonEmployeeDirectorStockOptionMember |  |  | 750,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = aciw_NonEmployeeDirectorStockOptionMember |  |  | 750,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = aciw_NonEmployeeDirectorStockOptionMember |
Stock option expiration period |  | March 2005 |  |  |  |  |  |  |
Term of outstanding options |  | 10 years |  |  |  |  |  |  |
1999 Stock Option Plan |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Number of shares authorized |  | 12,000,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = aciw_StockPlanNineteenNinetyNineMember |  |  | 12,000,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = aciw_StockPlanNineteenNinetyNineMember |  |  | 12,000,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = aciw_StockPlanNineteenNinetyNineMember |
Stock option expiration period |  | February 2009 |  |  |  |  |  |  |
Term of outstanding options |  | 10 years |  |  |  |  |  |  |
1999 Stock Option Plan | Minimum |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
LTIP Performance Shares, Performance period |  | 3 years |  |  |  |  |  |  |
1999 Stock Option Plan | Maximum |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
LTIP Performance Shares, Performance period |  | 4 years |  |  |  |  |  |  |
LTIP Performance Shares |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Maximum attainment percentage that may be achieved for LTIP Performance Shares |  | 200.00%aciw_ShareBasedCompensationArrangementsPerformanceSharesMaximumTarget / us-gaap_PlanNameAxis = aciw_LongTermIncentivePlansMember | 200.00%aciw_ShareBasedCompensationArrangementsPerformanceSharesMaximumTarget / us-gaap_PlanNameAxis = aciw_LongTermIncentivePlansMember | 200.00%aciw_ShareBasedCompensationArrangementsPerformanceSharesMaximumTarget / us-gaap_PlanNameAxis = aciw_LongTermIncentivePlansMember | 200.00%aciw_ShareBasedCompensationArrangementsPerformanceSharesMaximumTarget / us-gaap_PlanNameAxis = aciw_LongTermIncentivePlansMember |  | 200.00%aciw_ShareBasedCompensationArrangementsPerformanceSharesMaximumTarget / us-gaap_PlanNameAxis = aciw_LongTermIncentivePlansMember | 200.00%aciw_ShareBasedCompensationArrangementsPerformanceSharesMaximumTarget / us-gaap_PlanNameAxis = aciw_LongTermIncentivePlansMember |
Restricted shares awards, shares vested |  | 635,643 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_PlanNameAxis = aciw_LongTermIncentivePlansMember | 982,728 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_PlanNameAxis = aciw_LongTermIncentivePlansMember | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_PlanNameAxis = aciw_LongTermIncentivePlansMember |  |  |  |  |
Restricted shares withheld to pay employees' portion of minimum payroll withholding taxes |  | 228,279 us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation / us-gaap_PlanNameAxis = aciw_LongTermIncentivePlansMember | 338,262 us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation / us-gaap_PlanNameAxis = aciw_LongTermIncentivePlansMember |  |  |  |  |  |
LTIP Performance Shares | Minimum |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
LTIP Performance Shares, Performance period |  | 1 year | 1 year | 1 year |  |  |  |  |
LTIP Performance Shares | Maximum |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
LTIP Performance Shares, Performance period |  | 3 years | 3 years | 3 years |  |  |  |  |
S1 2003 Stock Incentive Plan |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Restricted shares awards, shares vested |  | 19,822 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_PlanNameAxis = aciw_StockIncentivePlanTwentyZeroThreeMember | 35,598 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_PlanNameAxis = aciw_StockIncentivePlanTwentyZeroThreeMember | 302,055 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_PlanNameAxis = aciw_StockIncentivePlanTwentyZeroThreeMember |  |  |  |  |
Restricted shares withheld to pay employees' portion of minimum payroll withholding taxes |  | 5,980 us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation / us-gaap_PlanNameAxis = aciw_StockIncentivePlanTwentyZeroThreeMember | 11,307 us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation / us-gaap_PlanNameAxis = aciw_StockIncentivePlanTwentyZeroThreeMember | 114,501 us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation / us-gaap_PlanNameAxis = aciw_StockIncentivePlanTwentyZeroThreeMember |  |  |  |  |

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- Definition Date the amended term for the Employee Stock Purchase Plan is scheduled to end. + References No definition available. + Details
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- Definition Employee Stock Purchase Plan, Purchase Price of Shares + References No definition available. + Details
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- Definition Date the amended term for the Employee Stock Purchase Plan commenced. + References No definition available. + Details
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- Definition Percentage of restricted share awards that vest on each anniversary date from the date of grant. + References No definition available. + Details
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Namespace Prefix: | aciw_
Data Type: | num:percentItemType
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- Definition Share Based Compensation Arrangement by Share Based Payment Award, Equity Instruments Other Than Options, Grant Date + References No definition available. + Details
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- Definition The highest dollar amount from their salary that an employee is permitted to utilize with respect to the plan. + References No definition available. + Details
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- Definition Share based Compensation Arrangement by Share based Payment Award, Number of Shares Authorized, Prior to Amendment + References No definition available. + Details
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- Definition Extension of the term of the employee stock purchase plan. + References No definition available. + Details
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- Definition The expected attainment percentage for the LTIP Performance Shares based upon forecasted sales and operating income. + References No definition available. + Details
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- Definition The maximum percentage that can be achieved under the predetermined performance thresholds for the LTIP performance shares. + References No definition available. + Details
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- Definition The percentage of outstanding stock options expected to vest over the remaining vesting period. + References No definition available. + Details
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- Definition If an employee is terminated without cause within 12 months of the acquisition date of S1 Corporation the Transaction RSAs 100% vest. + References No definition available. + Details
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- Definition Expiration date month and year of company stock incentive plan. + References No definition available. + Details
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- Definition Aggregate dividends paid during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Disclosure of the aggregate tax benefit realized from the exercise of stock options and the conversion of similar instruments during the annual period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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X
- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition General descriptive information regarding an arrangement under which employees and directors receive: (a) awards of equity shares, equity share options, or other equity instruments; or (b) the entity incurs liabilities to them: (1) in amounts based, at least in part, on the price of the entity's shares or other equity instruments; or (2) that require or may require settlement by issuance of the entity's shares. Such an arrangement is usually provided to employees and directors to compensate them, provide performance incentives to them, and to attract or retain their services. May also include pertinent information particular to a plan that is not elsewhere specified in the taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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X
- Definition Discount rate from fair value on offering date that participants pay for shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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Data Type: | num:percentItemType
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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Period Type: | duration

X
- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Details
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- Definition The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Net number of share options (or share units) granted during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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X
- Definition Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Purchase price of common stock expressed as a percentage of its fair value. + References No definition available. + Details
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- Definition For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer. + References No definition available. + Details
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- Definition Number of shares issued during the period as a result of an employee stock purchase plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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