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Purchase Price of S1 Corporation's Common stock (Detail) (USD $) In Thousands, unless otherwise specified	0 Months Ended	12 Months Ended		0 Months Ended
	Aug. 12, 2014	Dec. 31, 2013	Dec. 31, 2012	Feb. 13, 2012
Business Acquisition [Line Items]
Issuance of ACI common stock			$ 204,856us-gaap_StockIssuedDuringPeriodValueAcquisitions
Reissuance of treasury stock			2,174aciw_TreasuryStockReissuedInAcquisitionValue
Cash payments	205,100us-gaap_PaymentsToAcquireBusinessesGross		641,700us-gaap_PaymentsToAcquireBusinessesGross
Total Purchase Price		378,100us-gaap_BusinessCombinationConsiderationTransferred1
S1 Corporation
Business Acquisition [Line Items]
Cash payments				365,918aciw_BusinessCombinationCashPaymentsToAcquireeShareholders / us-gaap_BusinessAcquisitionAxis = aciw_SOneCorporationMember
Issuance of ACI common stock				204,857us-gaap_StockIssuedDuringPeriodValueAcquisitions / us-gaap_BusinessAcquisitionAxis = aciw_SOneCorporationMember
Reissuance of treasury stock				2,174aciw_TreasuryStockReissuedInAcquisitionValue / us-gaap_BusinessAcquisitionAxis = aciw_SOneCorporationMember
Cash payments				368,700us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = aciw_SOneCorporationMember
S1 shares previously held as available-for-sale securities				11,557aciw_BusinessCombinationSharesPreviouslyHeldAsAvailableForSaleSecurities / us-gaap_BusinessAcquisitionAxis = aciw_SOneCorporationMember
Total Purchase Price				587,284us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = aciw_SOneCorporationMember
S1 Corporation | Covenant not to compete
Business Acquisition [Line Items]
Cash payments				$ 2,778us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = aciw_SOneCorporationMember / us-gaap_ContingentConsiderationByTypeAxis = us-gaap_NoncompeteAgreementsMember

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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-Topic 805

-SubTopic 30

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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