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Debt - Additional Information (Detail) (USD $)
 12 Months Ended 0 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Aug. 20, 2014
Aug. 20, 2013
Aug. 12, 2014
Nov. 10, 2011
Debt Instrument [Line Items]              
Credit Facility maturity date Aug. 20, 2018            
Additional borrowing $ 169,500,000us-gaap_ProceedsFromLinesOfCredit $ 40,000,000us-gaap_ProceedsFromLinesOfCredit $ 119,000,000us-gaap_ProceedsFromLinesOfCredit        
Debt issuance cost paid 4,662,000us-gaap_PaymentsOfDebtIssuanceCosts 17,042,000us-gaap_PaymentsOfDebtIssuanceCosts 1,094,000us-gaap_PaymentsOfDebtIssuanceCosts        
Credit facility, interest rate description The applicable margin for borrowings under the Revolving Credit Facility is, based on the calculation of the applicable consolidated total leverage ratio, between 0.50% to 1.50% with respect to base rate borrowings and between 1.50% and 2.50% with respect to LIBOR based borrowings. Interest is due and payable monthly. The interest rate in effect at December 31, 2014 for the Credit Facility was 2.67%.            
Credit facility, interest rate margin above federal fund rate 1.00%aciw_DebtInstrumentInterestAdditionalInterestAboveFederalFundRate            
Credit facility, interest rate margin above one-month LIBOR rate 1.00%aciw_DebtInstrumentInterestAdditionalInterestAboveOneMonthLondonInterbankOfferedRateRate            
Credit facility, borrowing rate 2.67%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd            
Maturity date of senior notes Aug. 15, 2020            
Other current liabilities 7,340,000us-gaap_OtherNotesPayableCurrent 6,410,000us-gaap_OtherNotesPayableCurrent          
Minimum              
Debt Instrument [Line Items]              
Credit facility, interest rate margin above base rate 0.50%aciw_DebtInstrumentInterestRateLondonInterbankOfferedRateMargin
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		            
Credit facility, interest rate margin above LIBOR rate 1.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		            
Maximum              
Debt Instrument [Line Items]              
Credit facility, interest rate margin above base rate 1.50%aciw_DebtInstrumentInterestRateLondonInterbankOfferedRateMargin
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		            
Credit facility, interest rate margin above LIBOR rate 2.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		            
Fourth Amendment              
Debt Instrument [Line Items]              
Borrowing under credit facility after amendment       300,000,000aciw_CreditAgreementMaximumOptionalIncrementalTermLoansAndOrRevolvingCreditFacility
/ us-gaap_LongtermDebtTypeAxis
= aciw_FourthAmendmentMember		      
Borrowing under credit facility       200,000,000aciw_CreditAgreementMinimumOptionalIncrementalTermLoansAndOrRevolvingCreditFacility
/ us-gaap_LongtermDebtTypeAxis
= aciw_FourthAmendmentMember		      
Credit Facility maturity date       Aug. 20, 2018      
Senior Notes              
Debt Instrument [Line Items]              
Senior notes amount outstanding 300,000,000us-gaap_SeniorLongTermNotes
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		       300,000,000us-gaap_SeniorLongTermNotes
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		    
Percentage of interest rate on notes       6.375%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		 6.375%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		    
Debt issuance cost incurred         6,100,000us-gaap_DebtIssuanceCosts
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		    
Debt issuance cost paid 200,000us-gaap_PaymentsOfDebtIssuanceCosts
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		 5,900,000us-gaap_PaymentsOfDebtIssuanceCosts
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		          
Issue price percentage of senior notes of the principal amount         100.00%aciw_DebtInstrumentIssuePricePercentageOfPrincipalAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		    
Maturity date of senior notes         Aug. 20, 2020    
Fifth Amendment | Minimum              
Debt Instrument [Line Items]              
Credit agreement intercompany indebtedness permitted amount           75,000,000aciw_CreditAgreementIntercompanyIndebtednessPermittedAmount
/ us-gaap_LongtermDebtTypeAxis
= aciw_FifthAmendmentMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		  
Credit agreement intercompany unsecured indebtedness permitted amount           350,000,000aciw_CreditAgreementIntercompanyUnsecuredIndebtednessPermittedAmount
/ us-gaap_LongtermDebtTypeAxis
= aciw_FifthAmendmentMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		  
Fifth Amendment | Maximum              
Debt Instrument [Line Items]              
Credit agreement intercompany indebtedness permitted amount           225,000,000aciw_CreditAgreementIntercompanyIndebtednessPermittedAmount
/ us-gaap_LongtermDebtTypeAxis
= aciw_FifthAmendmentMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		  
Credit agreement intercompany unsecured indebtedness permitted amount           500,000,000aciw_CreditAgreementIntercompanyUnsecuredIndebtednessPermittedAmount
/ us-gaap_LongtermDebtTypeAxis
= aciw_FifthAmendmentMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		  
License agreement              
Debt Instrument [Line Items]              
Financed internally-used software     14,800,000aciw_SoftwareLicensesFinanced
/ us-gaap_DebtInstrumentAxis
= us-gaap_ContractualRightsMember		        
License agreement period     5 years        
Annual payments due date     April through 2016        
Total other liabilities 6,300,000us-gaap_OtherLiabilities
/ us-gaap_DebtInstrumentAxis
= us-gaap_ContractualRightsMember		 9,300,000us-gaap_OtherLiabilities
/ us-gaap_DebtInstrumentAxis
= us-gaap_ContractualRightsMember		          
Other current liabilities 3,100,000us-gaap_OtherNotesPayableCurrent
/ us-gaap_DebtInstrumentAxis
= us-gaap_ContractualRightsMember		 3,000,000us-gaap_OtherNotesPayableCurrent
/ us-gaap_DebtInstrumentAxis
= us-gaap_ContractualRightsMember		          
Other noncurrent liabilities 3,200,000us-gaap_OtherLongTermDebtNoncurrent
/ us-gaap_DebtInstrumentAxis
= us-gaap_ContractualRightsMember		 6,300,000us-gaap_OtherLongTermDebtNoncurrent
/ us-gaap_DebtInstrumentAxis
= us-gaap_ContractualRightsMember		          
Revolving Credit Facility              
Debt Instrument [Line Items]              
Line of credit facility amount outstanding 44,000,000us-gaap_LineOfCredit
/ us-gaap_LineOfCreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember		            
Unused borrowings 206,000,000us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount
/ us-gaap_LineOfCreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember		            
Credit facilities, maximum borrowing capacity             250,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LineOfCreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
Credit facilities, maturity             5 years
Additional borrowing           60,500,000us-gaap_ProceedsFromLinesOfCredit
/ us-gaap_LineOfCreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember		  
Term Credit Facility              
Debt Instrument [Line Items]              
Line of credit facility amount outstanding 547,900,000us-gaap_LineOfCredit
/ us-gaap_LineOfCreditFacilityAxis
= aciw_TermLoanFacilityMember		            
Credit facilities, maximum borrowing capacity             500,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LineOfCreditFacilityAxis
= aciw_TermLoanFacilityMember
Credit facilities, maturity             5 years
Additional borrowing           150,000,000us-gaap_ProceedsFromLinesOfCredit
/ us-gaap_LineOfCreditFacilityAxis
= aciw_TermLoanFacilityMember		  
Debt issuance cost incurred             28,600,000us-gaap_DebtIssuanceCosts
/ us-gaap_LineOfCreditFacilityAxis
= aciw_TermLoanFacilityMember
Debt issuance cost paid $ 4,500,000us-gaap_PaymentsOfDebtIssuanceCosts
/ us-gaap_LineOfCreditFacilityAxis
= aciw_TermLoanFacilityMember		 $ 11,300,000us-gaap_PaymentsOfDebtIssuanceCosts
/ us-gaap_LineOfCreditFacilityAxis
= aciw_TermLoanFacilityMember		 $ 12,800,000us-gaap_PaymentsOfDebtIssuanceCosts
/ us-gaap_LineOfCreditFacilityAxis
= aciw_TermLoanFacilityMember		        
Parent Company and Domestic Subsidiaries              
Debt Instrument [Line Items]              
Percentage of capital stock pledged as collateral 100.00%aciw_PercentageOfCapitalStockPledgedAsCollateral
/ dei_LegalEntityAxis
= aciw_ParentCompanyAndDomesticSubsidiariesMember		            
Foreign Subsidiaries              
Debt Instrument [Line Items]              
Percentage of capital stock pledged as collateral 65.00%aciw_PercentageOfCapitalStockPledgedAsCollateral
/ dei_LegalEntityAxis
= aciw_ForeignSubsidiariesMember