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Summary of Differences Between Income Tax Expense Computed at Statutory Federal Income Tax Rate and Per Consolidated Statements of Income (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Tax expense at federal rate of 35%									$ 34,569us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	$ 32,606us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	$ 22,844us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
State income taxes, net of federal benefit									(544)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes	675us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes	655us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Change in valuation allowance									3,521us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	(1,615)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	(2,680)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Foreign tax rate differential									(5,508)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential	(4,650)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential	(8,940)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential
Unrecognized tax benefit increase (decrease)									65us-gaap_IncomeTaxReconciliationTaxContingencies	488us-gaap_IncomeTaxReconciliationTaxContingencies	(1,665)us-gaap_IncomeTaxReconciliationTaxContingencies
Tax effect of foreign operations									(104)aciw_TaxEffectOfForeignOperations	5,906aciw_TaxEffectOfForeignOperations	5,311aciw_TaxEffectOfForeignOperations
Acquisition Costs									289aciw_IncomeTaxReconciliationAcquisitionCosts	896aciw_IncomeTaxReconciliationAcquisitionCosts	2,659aciw_IncomeTaxReconciliationAcquisitionCosts
Tax benefit of research & development									(3,446)us-gaap_IncomeTaxReconciliationTaxCreditsResearch	(4,001)us-gaap_IncomeTaxReconciliationTaxCreditsResearch	(1,749)us-gaap_IncomeTaxReconciliationTaxCreditsResearch
Other									2,367us-gaap_IncomeTaxReconciliationOtherAdjustments	(1,014)us-gaap_IncomeTaxReconciliationOtherAdjustments	(13)us-gaap_IncomeTaxReconciliationOtherAdjustments
Income tax provision	$ 23,334us-gaap_IncomeTaxExpenseBenefit	$ 9,433us-gaap_IncomeTaxExpenseBenefit	$ 2,409us-gaap_IncomeTaxExpenseBenefit	$ (3,967)us-gaap_IncomeTaxExpenseBenefit	$ 24,108us-gaap_IncomeTaxExpenseBenefit	$ 5,347us-gaap_IncomeTaxExpenseBenefit	$ 2,280us-gaap_IncomeTaxExpenseBenefit	$ (2,444)us-gaap_IncomeTaxExpenseBenefit	$ 31,209us-gaap_IncomeTaxExpenseBenefit	$ 29,291us-gaap_IncomeTaxExpenseBenefit	$ 16,422us-gaap_IncomeTaxExpenseBenefit

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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