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Carrying Value of Senior Notes (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Total debt	$ 891,935us-gaap_LongTermDebt	$ 755,383us-gaap_LongTermDebt
Less current portion of term credit facility	87,352us-gaap_LongTermDebtCurrent	47,313us-gaap_LongTermDebtCurrent
Total long-term debt	804,583us-gaap_LongTermDebtNoncurrent	708,070us-gaap_LongTermDebtNoncurrent
Term credit facility
Debt Instrument [Line Items]
Total debt	547,935us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = aciw_TermCreditFacilityMember	455,383us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = aciw_TermCreditFacilityMember
6.375% Senior Notes, due August 2020
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
Debt Instrument [Line Items]
Total debt	$ 44,000us-gaap_LongTermDebt / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember

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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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