Goodwill Impairment Test Period

No definition available.

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- Definition

The balance of the settlement accounts at period end. Settlement accounts are trust accounts maintained for the benefit of the Company's clients. They are not included in the Company's balance sheet.

+ References

No definition available.

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- Definition

Face amount or stated value per share of common stock.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

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- Definition

Description of risks that arise due to the volume of business transacted with a particular customer. At a minimum, the description informs financial statement users of the general nature of the risk, but excludes "Information about Major Customers" that may be disclosed elsewhere (for instance, segment disclosures).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

-SubTopic 10

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-Topic 275

-SubTopic 10

-Section 50

-Paragraph 18

-Subparagraph (a)

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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.

+ Details

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- Definition

Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which is directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent (that is, noncontrolling interest, previously referred to as minority interest).

+ References

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-Publisher FASB

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-Topic 210

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-Section S99

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-Subparagraph (SX 210.5-02.31)

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-Number 210

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 20

-Article 7

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- Definition

Amount of cash outflow to a noncontrolling interest. Includes, but not limited to, reduction of noncontrolling interest ownership. Excludes dividends paid to the noncontrolling interest.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

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-Topic 230

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- Definition

Description of the stock split arrangement. Also provide the retroactive effect given by a stock split that occurs after the balance date but before the release of financial statements.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Stock Split

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

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-Section S99

-Paragraph 4

-Subparagraph (SAB TOPIC 4.C)

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-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 4

-Section C

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Nature of Business and Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	0 Months Ended	12 Months Ended
	Apr. 10, 2014	Dec. 31, 2014	Dec. 31, 2013
Summary Of Significant Accounting Policies [Line Items]
Common stock, par value	$ 0.005	$ 0.005	$ 0.005
Description of Stock split	Three-for-one	On April 10, 2014, the Company announced that its Board of Directors approved a three-for-one stock split of the Company's common stock, which was affected in the form of a common stock dividend distributed on July 10, 2014.
Payments for partnership dissolved		$ 1,391,000us-gaap_PaymentsToMinorityShareholders
Percentage of receivables		No customer accounted for more than 10% of the Company's consolidated receivables balance as of December 31, 2014 or 2013.	No customer accounted for more than 10% of the Company's consolidated receivables balance as of December 31, 2014 or 2013.
Amount of off balance sheet settlement funds		224,900,000aciw_SettlementAccountsBalance	284,000,000aciw_SettlementAccountsBalance
Goodwill measurement period		1 year
Cornastone Technology Investments (Proprietary) Limited
Summary Of Significant Accounting Policies [Line Items]
Payments for partnership dissolved		1,500,000
Minimum
Summary Of Significant Accounting Policies [Line Items]
Estimated useful life		3 years
Minimum \| Software Acquired or Developed for Internal Use
Summary Of Significant Accounting Policies [Line Items]
Estimated useful life		3 years
Maximum
Summary Of Significant Accounting Policies [Line Items]
Estimated useful life		20 years
Maximum \| Software Acquired or Developed for Internal Use
Summary Of Significant Accounting Policies [Line Items]
Estimated useful life		10 years
Other Noncurrent Liabilities \| Cornastone Technology Investments (Proprietary) Limited
Summary Of Significant Accounting Policies [Line Items]
Noncontrolling interest			$ 1,100,000