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Debt - Carrying Value of Debt (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
Total debt $ 850,083us-gaap_LongTermDebt $ 891,935us-gaap_LongTermDebt
Less current portion of term credit facility 91,323us-gaap_LongTermDebtCurrent 87,352us-gaap_LongTermDebtCurrent
Total long-term debt 758,760us-gaap_LongTermDebtNoncurrent 804,583us-gaap_LongTermDebtNoncurrent
Term Credit Facility [Member]    
Debt Instrument [Line Items]    
Total debt 528,083us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= aciw_TermCreditFacilityMember		 547,935us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= aciw_TermCreditFacilityMember
6.375% Senior Notes, due August 2020 [Member]    
Debt Instrument [Line Items]    
Total debt 300,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= aciw_SeniorNotesSixPointThreeSevenFivePercentDueTwoThousandTwentyMember		 300,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= aciw_SeniorNotesSixPointThreeSevenFivePercentDueTwoThousandTwentyMember
Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Total debt $ 22,000us-gaap_LongTermDebt
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember		 $ 44,000us-gaap_LongTermDebt
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember