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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   $ 5,000,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsOther    
Foreign tax credits carryforwards   27,200,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign    
Unrecognized tax benefit 14,780,000us-gaap_UnrecognizedTaxBenefits 14,996,000us-gaap_UnrecognizedTaxBenefits 13,079,000us-gaap_UnrecognizedTaxBenefits 4,012,000us-gaap_UnrecognizedTaxBenefits
Net unrecognized tax benefits that, if recognized, would favorably impact the effective income tax rate 13,000,000us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate 13,200,000us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate    
Decrease in unrecognized tax benefits due to the expiration of statutes of limitations and the settlement of various audits 5,000,000us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleAmountOfUnrecordedBenefit      
Accrued interest and penalties related to income tax liabilities 2,400,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued 2,300,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued    
Aggregate amount of interest and penalties recorded in the statement of operations 200,000us-gaap_IncomeTaxExaminationPenaltiesAndInterestExpense 400,000us-gaap_IncomeTaxExaminationPenaltiesAndInterestExpense (200,000)us-gaap_IncomeTaxExaminationPenaltiesAndInterestExpense  
Undistributed earning of foreign subsidiaries 212,100,000us-gaap_UndistributedEarningsOfForeignSubsidiaries      
Effects of retroactive changes in tax law     1,400,000aciw_EstimatedTaxBenefitFromEnactedTaxLaw  
Decrease in deferred tax assets valuation allowance 3,600,000us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount      
Domestic Tax Authority        
Income Taxes [Line Items]        
Tax credits expiration year 2020      
General business tax credit carryforwards 10,300,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsGeneralBusiness
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember		      
Deferred tax assets operating loss carry forwards subject to expiration 358,100,000us-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 32,900,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember		      
Valuation allowance against tax credit 9,200,000us-gaap_TaxCreditCarryforwardValuationAllowance
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember		      
Tax credits expiration year 2015      
Deferred tax assets operating loss carry forwards 70,600,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember		      
Deferred tax assets operating loss carry forwards not subject to expiration 60,600,000us-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 $ 6,700,000us-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.