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Income Taxes - Additional Information (Detail) (USD $) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Income Taxes [Line Items] |  |  |  |
Deferred tax assets tax credit carryforwards other |  | $ 5,000,000 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsOther |  |
Foreign tax credits carryforwards |  | 27,200,000 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign |  |
Unrecognized tax benefit | 14,780,000 us-gaap_UnrecognizedTaxBenefits | 14,996,000 us-gaap_UnrecognizedTaxBenefits | 13,079,000 us-gaap_UnrecognizedTaxBenefits | 4,012,000 us-gaap_UnrecognizedTaxBenefits
Net unrecognized tax benefits that, if recognized, would favorably impact the effective income tax rate | 13,000,000 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate | 13,200,000 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate |  |
Decrease in unrecognized tax benefits due to the expiration of statutes of limitations and the settlement of various audits | 5,000,000 us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleAmountOfUnrecordedBenefit |  |  |
Accrued interest and penalties related to income tax liabilities | 2,400,000 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued | 2,300,000 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued |  |
Aggregate amount of interest and penalties recorded in the statement of operations | 200,000 us-gaap_IncomeTaxExaminationPenaltiesAndInterestExpense | 400,000 us-gaap_IncomeTaxExaminationPenaltiesAndInterestExpense | (200,000)us-gaap_IncomeTaxExaminationPenaltiesAndInterestExpense |
Undistributed earning of foreign subsidiaries | 212,100,000 us-gaap_UndistributedEarningsOfForeignSubsidiaries |  |  |
Effects of retroactive changes in tax law |  |  | 1,400,000 aciw_EstimatedTaxBenefitFromEnactedTaxLaw |
Decrease in deferred tax assets valuation allowance | 3,600,000 us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount |  |  |
Domestic Tax Authority |  |  |  |
Income Taxes [Line Items] |  |  |  |
Tax credits expiration year | 2020 |  |  |
General business tax credit carryforwards | 10,300,000 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsGeneralBusiness / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember |  |  |
Deferred tax assets operating loss carry forwards subject to expiration | 358,100,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsSubjectToExpiration / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember |  |  |
Deferred tax assets operating loss carry forwards expiration year | 2017 |  |  |
Domestic Tax Authority | Earliest Tax Year [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Tax years open for audit | 2010 |  |  |
Domestic Tax Authority | Latest Tax Year [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Tax years open for audit | 2011 |  |  |
Foreign Entities |  |  |  |
Income Taxes [Line Items] |  |  |  |
Foreign tax credits carryforwards | 32,900,000 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember |  |  |
Valuation allowance against tax credit | 9,200,000 us-gaap_TaxCreditCarryforwardValuationAllowance / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember |  |  |
Tax credits expiration year | 2015 |  |  |
Deferred tax assets operating loss carry forwards | 70,600,000 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember |  |  |
Deferred tax assets operating loss carry forwards not subject to expiration | 60,600,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsNotSubjectToExpiration / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember |  |  |
Deferred tax assets operating loss carry forwards not subject to expiration, expiration period | 10 years |  |  |
Valuation allowance against the tax benefit associated with NOLs | $ 6,700,000 us-gaap_OperatingLossCarryforwardsValuationAllowance / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember |  |  |
Foreign Entities | Earliest Tax Year [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Tax years open for audit | 2002 |  |  |
Foreign Entities | Latest Tax Year [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Tax years open for audit | 2013 |  |  |
India Tax Authority |  |  |  |
Income Taxes [Line Items] |  |  |  |
Income tax examination description | The Company's Indian income tax returns covering fiscal years 2002 through 2007 and 2010 through 2012 are under audit by the Indian tax authority. |  |  |

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