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Revenues, by Product Line (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenue from External Customer [Line Items]
Revenues	$ 290,224us-gaap_SalesRevenueNet	$ 249,644us-gaap_SalesRevenueNet	$ 254,808us-gaap_SalesRevenueNet	$ 221,473us-gaap_SalesRevenueNet	$ 283,162us-gaap_SalesRevenueNet	$ 213,939us-gaap_SalesRevenueNet	$ 205,830us-gaap_SalesRevenueNet	$ 161,997us-gaap_SalesRevenueNet	$ 1,016,149us-gaap_SalesRevenueNet	$ 864,928us-gaap_SalesRevenueNet	$ 666,579us-gaap_SalesRevenueNet
Retail payments processing
Revenue from External Customer [Line Items]
Revenues									406,023us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = aciw_RetailPaymentsProcessingMember	410,200us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = aciw_RetailPaymentsProcessingMember	372,942us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = aciw_RetailPaymentsProcessingMember
Online banking and community financial services
Revenue from External Customer [Line Items]
Revenues									227,659us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = aciw_OnlineBankingAndCommunityFinancialServicesMember	223,902us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = aciw_OnlineBankingAndCommunityFinancialServicesMember	169,652us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = aciw_OnlineBankingAndCommunityFinancialServicesMember
Wholesale banking payments
Revenue from External Customer [Line Items]
Revenues									37,879us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = aciw_WholesaleBankingPaymentsMember	35,396us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = aciw_WholesaleBankingPaymentsMember	39,717us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = aciw_WholesaleBankingPaymentsMember
Payment fraud management
Revenue from External Customer [Line Items]
Revenues									36,235us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = aciw_PaymentFraudManagementMember	37,136us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = aciw_PaymentFraudManagementMember	25,160us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = aciw_PaymentFraudManagementMember
Card and merchant management
Revenue from External Customer [Line Items]
Revenues									32,887us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = aciw_CardAndMerchantManagementMember	18,072us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = aciw_CardAndMerchantManagementMember	21,963us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = aciw_CardAndMerchantManagementMember
Tools and infrastructure
Revenue from External Customer [Line Items]
Revenues									40,427us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = aciw_ToolsAndInfrastructureMember	38,241us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = aciw_ToolsAndInfrastructureMember	37,145us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = aciw_ToolsAndInfrastructureMember
Billers
Revenue from External Customer [Line Items]
Revenues									$ 235,039us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = aciw_BillersMember	$ 101,981us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = aciw_BillersMember

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- Definition

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

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