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Software and Other Intangible Assets - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]
Software, net	$ 209,507,000us-gaap_CapitalizedComputerSoftwareNet	$ 191,468,000us-gaap_CapitalizedComputerSoftwareNet
Software, accumulated amortization	121,600,000us-gaap_CapitalizedComputerSoftwareAccumulatedAmortization	95,300,000us-gaap_CapitalizedComputerSoftwareAccumulatedAmortization
Other intangible assets amortization expense	24,700,000us-gaap_AmortizationOfIntangibleAssets	18,500,000us-gaap_AmortizationOfIntangibleAssets	12,100,000us-gaap_AmortizationOfIntangibleAssets
Minimum
Finite-Lived Intangible Assets [Line Items]
Estimated useful life	3 years
Maximum
Finite-Lived Intangible Assets [Line Items]
Estimated useful life	20 years
Software Marketed for External Sale
Finite-Lived Intangible Assets [Line Items]
Software, net	85,900,000us-gaap_CapitalizedComputerSoftwareNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = aciw_SoftwareMarketedForExternalSaleMember	94,000,000us-gaap_CapitalizedComputerSoftwareNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = aciw_SoftwareMarketedForExternalSaleMember
Software, amortization expense	14,800,000us-gaap_CapitalizedComputerSoftwareAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = aciw_SoftwareMarketedForExternalSaleMember	13,600,000us-gaap_CapitalizedComputerSoftwareAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = aciw_SoftwareMarketedForExternalSaleMember	13,800,000us-gaap_CapitalizedComputerSoftwareAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = aciw_SoftwareMarketedForExternalSaleMember
Software Marketed for External Sale | Minimum
Finite-Lived Intangible Assets [Line Items]
Estimated useful life	3 years
Software Marketed for External Sale | Maximum
Finite-Lived Intangible Assets [Line Items]
Estimated useful life	10 years
Software Acquired or Developed for Internal Use
Finite-Lived Intangible Assets [Line Items]
Software, net	123,600,000us-gaap_CapitalizedComputerSoftwareNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = aciw_SoftwareAcquiredOrDevelopedForInternalUseMember	97,500,000us-gaap_CapitalizedComputerSoftwareNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = aciw_SoftwareAcquiredOrDevelopedForInternalUseMember
Software, amortization expense	$ 26,700,000us-gaap_CapitalizedComputerSoftwareAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = aciw_SoftwareAcquiredOrDevelopedForInternalUseMember	$ 19,100,000us-gaap_CapitalizedComputerSoftwareAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = aciw_SoftwareAcquiredOrDevelopedForInternalUseMember	$ 11,600,000us-gaap_CapitalizedComputerSoftwareAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = aciw_SoftwareAcquiredOrDevelopedForInternalUseMember
Software Acquired or Developed for Internal Use | Minimum
Finite-Lived Intangible Assets [Line Items]
Estimated useful life	3 years
Software Acquired or Developed for Internal Use | Maximum
Finite-Lived Intangible Assets [Line Items]
Estimated useful life	10 years

X

- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

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-Section 50

-Paragraph 2

-Subparagraph (a)(2)

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X

- Definition

For each balance sheet presented, the amount of accumulated amortization for capitalized computer software costs.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 985

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

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-Section 50

-Paragraph 2

-Subparagraph (a)

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X

- Definition

For each income statement presented, the amount charged to expense for amortization of capitalized computer software costs.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 985

-SubTopic 20

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128487-111756



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-Publisher FASB

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-Topic 985

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-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756

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- Definition

The carrying amount of capitalized computer software costs net of accumulated amortization as of the balance sheet date.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 985

-SubTopic 20

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128487-111756



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- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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