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Common Stock and Treasury Stock - Additional Information (Detail) (USD $) | 3 Months Ended | 36 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2015 | 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 | 0 us-gaap_StockRepurchasedDuringPeriodShares | 37,108,467 us-gaap_StockRepurchasedDuringPeriodShares |  |  |  |  |
Repurchase of common stock, value |  | 395,800,000 us-gaap_StockRepurchasedDuringPeriodValue |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |
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 |  |  |  |  |  |

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- Definition The additional amount authorized by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
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Namespace Prefix: | aciw_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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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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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

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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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Balance Type: | debit
Period Type: | duration

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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Definition Amount remaining of a stock repurchase plan authorized. + References No definition available. + Details
Name: | us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |