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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 |  |  | $ 204,856 us-gaap_StockIssuedDuringPeriodValueAcquisitions |
Reissuance of treasury stock |  |  | 2,174 aciw_TreasuryStockReissuedInAcquisitionValue |
Cash payments | 205,100 us-gaap_PaymentsToAcquireBusinessesGross |  | 641,700 us-gaap_PaymentsToAcquireBusinessesGross |
Total Purchase Price |  | 378,100 us-gaap_BusinessCombinationConsiderationTransferred1 |  |
S1 Corporation |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Cash payments |  |  |  | 365,918 aciw_BusinessCombinationCashPaymentsToAcquireeShareholders / us-gaap_BusinessAcquisitionAxis = aciw_SOneCorporationMember
Issuance of ACI common stock |  |  |  | 204,857 us-gaap_StockIssuedDuringPeriodValueAcquisitions / us-gaap_BusinessAcquisitionAxis = aciw_SOneCorporationMember
Reissuance of treasury stock |  |  |  | 2,174 aciw_TreasuryStockReissuedInAcquisitionValue / us-gaap_BusinessAcquisitionAxis = aciw_SOneCorporationMember
Cash payments |  |  |  | 368,700 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = aciw_SOneCorporationMember
S1 shares previously held as available-for-sale securities |  |  |  | 11,557 aciw_BusinessCombinationSharesPreviouslyHeldAsAvailableForSaleSecurities / us-gaap_BusinessAcquisitionAxis = aciw_SOneCorporationMember
Total Purchase Price |  |  |  | 587,284 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = aciw_SOneCorporationMember
S1 Corporation | Covenant not to compete |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Cash payments |  |  |  | $ 2,778 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = aciw_SOneCorporationMember / us-gaap_ContingentConsiderationByTypeAxis = us-gaap_NoncompeteAgreementsMember

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- Definition 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 -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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