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Common Stock and Treasury Stock - Additional Information (Detail) (USD $) | 12 Months Ended | 36 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2014 | Feb. 28, 2014 | Jul. 31, 2013 | Feb. 29, 2012 | Dec. 31, 2011 | Sep. 13, 2012
Maximum stock authorized to purchase under stock repurchase program |  |  |  |  |  |  | $ 262,100,000 us-gaap_StockRepurchaseProgramAuthorizedAmount1 | $ 210,000,000 us-gaap_StockRepurchaseProgramAuthorizedAmount1 |
Increase in maximum stock authorized to purchase under stock repurchase program |  |  |  |  | 100,000,000 aciw_StockRepurchaseProgramAdditionalAuthorizedRepurchaseAmount | 100,000,000 aciw_StockRepurchaseProgramAdditionalAuthorizedRepurchaseAmount | 52,100,000 aciw_StockRepurchaseProgramAdditionalAuthorizedRepurchaseAmount |  |
Repurchase of common stock, shares | 3,578,427 us-gaap_StockRepurchasedDuringPeriodShares | 4,970,424 us-gaap_StockRepurchasedDuringPeriodShares | 4,313,076 us-gaap_StockRepurchasedDuringPeriodShares | 37,108,467 us-gaap_StockRepurchasedDuringPeriodShares |  |  |  |  |
Repurchase of common stock, value | 70,000,000 us-gaap_StockRepurchasedDuringPeriodValue | 80,912,000 us-gaap_StockRepurchasedDuringPeriodValue | 57,836,000 us-gaap_StockRepurchasedDuringPeriodValue | 395,800,000 us-gaap_StockRepurchasedDuringPeriodValue |  |  |  |  |
Number shares issued pursuant to stock option exercises | 2,036,558 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised | 2,478,183 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised | 2,541,903 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised |  |  |  |  |  |
Long-term incentive program performance share awards |  |  |  |  |  |  |  |  |
Stock issued during the period performance share award | 635,643 aciw_StockIssuedDuringPeriodSharesPerformanceShareAwardPlan / us-gaap_PlanNameAxis = aciw_LongTermEquityCompensationIncentivePlanLtipMember | 982,728 aciw_StockIssuedDuringPeriodSharesPerformanceShareAwardPlan / us-gaap_PlanNameAxis = aciw_LongTermEquityCompensationIncentivePlanLtipMember |  |  |  |  |  |  |
Restricted share awards (RSAs) |  |  |  |  |  |  |  |  |
Stock issued during the period restricted share awards | 106,275 aciw_StockIssuedDuringPeriodRestrictedShareAwards / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 25,989 aciw_StockIssuedDuringPeriodRestrictedShareAwards / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 679,782 aciw_StockIssuedDuringPeriodRestrictedShareAwards / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |  |  |  |  |  |
Stock Options |  |  |  |  |  |  |  |  |
Number shares issued pursuant to stock option exercises | 2,037,467 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_EmployeeStockOptionMember | 2,493,684 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_EmployeeStockOptionMember | 2,541,903 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |
Maximum stock authorized to purchase under stock repurchase program |  |  |  |  |  |  |  |  | 113,000,000 us-gaap_StockRepurchaseProgramAuthorizedAmount1 / us-gaap_RangeAxis = us-gaap_MaximumMember
Stock authorized to purchase under stock repurchase program, shares |  |  |  |  |  |  |  |  | 7,500,000 us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased / us-gaap_RangeAxis = us-gaap_MaximumMember
Remaining value of shares authorized for purchase under the stock repurchase program | $ 138,300,000 us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1 / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  | $ 138,300,000 us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1 / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |  |

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- Definition Number of share options (or share units) exercised during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28,29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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- Definition Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 + Details
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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
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- Definition The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
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