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

X

- Definition

Number of shares issued for restricted stock award grants and transaction restricted share awards converted upon the acquisition of S1 during the current period.

+ References

No definition available.

+ Details

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X

- Definition

Number of shares issued for performance share awards during the current period.

+ References

No definition available.

+ Details

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Namespace Prefix:	aciw_
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X

- 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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X

- 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

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Balance Type:	na
Period Type:	duration

X

- 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

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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

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- Definition

Amount of stock repurchase plan authorized.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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X

- 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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X

- Definition

Amount remaining of a stock repurchase plan authorized.

+ References

No definition available.

+ Details

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- Details

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- Details

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- Details

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