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Segment Information - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Number of geographic regions considered as reportable operating segments	3us-gaap_NumberOfReportableSegments
BASE24
Segment Reporting Information [Line Items]
Percentage of total revenues from licensing BASE24 product line	21.00%aciw_PercentageOfTotalRevenue / us-gaap_ProductOrServiceAxis = aciw_BaseTwentyFourMember	28.00%aciw_PercentageOfTotalRevenue / us-gaap_ProductOrServiceAxis = aciw_BaseTwentyFourMember	32.00%aciw_PercentageOfTotalRevenue / us-gaap_ProductOrServiceAxis = aciw_BaseTwentyFourMember
Geographic Concentration Risk
Segment Reporting Information [Line Items]
Percentage of revenues	No country outside of the United States accounted for more than 10% of the Company's consolidated revenues during the years ended December 31, 2014, 2013 and 2012.	No country outside of the United States accounted for more than 10% of the Company's consolidated revenues during the years ended December 31, 2014, 2013 and 2012.	No country outside of the United States accounted for more than 10% of the Company's consolidated revenues during the years ended December 31, 2014, 2013 and 2012.
Customer Concentration Risk
Segment Reporting Information [Line Items]
Percentage of revenues	No single customer accounted for more than 10% of the Company's consolidated revenues during the years ended December 31, 2014, 2013 and 2012.	No single customer accounted for more than 10% of the Company's consolidated revenues during the years ended December 31, 2014, 2013 and 2012.	No single customer accounted for more than 10% of the Company's consolidated revenues during the years ended December 31, 2014, 2013 and 2012.

X

- Definition

Percentage of total revenues derived from licensing the BASE24 product line, which does not include the BASE24-eps product, and providing related services and maintenance.

+ References

No definition available.

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X

- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

+ References

No definition available.

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X

- Definition

Disclosure of the extent of enterprise reliance on its major customers. For example, includes revenues from transactions with a single external customer amounting to 10 percent or more of the entity's revenues, the total amount of revenues from each such customer, and the identity of the segment or segments reporting the revenues. A group of entities that the entity knows to be under common control generally will be considered a single customer for inclusion in this item. The federal government, a state government, a local government (for example, a county or municipality), or a foreign government each will generally be considered as a single customer for inclusion in this item.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 280

-SubTopic 10

-Section 50

-Paragraph 42

-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9054-108599

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