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Segment Information - Selected Segment Financial Data, Assets (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Segment Reporting Information [Line Items] |  |
Assets | $ 1,771,494 us-gaap_Assets | $ 1,850,700 us-gaap_Assets
Americas - United States [Member] |  |
Segment Reporting Information [Line Items] |  |
Assets | 1,173,723 us-gaap_Assets / us-gaap_StatementGeographicalAxis = country_US | 1,210,674 us-gaap_Assets / us-gaap_StatementGeographicalAxis = country_US
Americas - Other [Member] |  |
Segment Reporting Information [Line Items] |  |
Assets | 30,304 us-gaap_Assets / us-gaap_StatementGeographicalAxis = aciw_OtherAmericasMember | 32,594 us-gaap_Assets / us-gaap_StatementGeographicalAxis = aciw_OtherAmericasMember
EMEA [Member] |  |
Segment Reporting Information [Line Items] |  |
Assets | 446,756 us-gaap_Assets / us-gaap_StatementGeographicalAxis = us-gaap_EMEAMember | 487,629 us-gaap_Assets / us-gaap_StatementGeographicalAxis = us-gaap_EMEAMember
Asia/Pacific [Member] |  |
Segment Reporting Information [Line Items] |  |
Assets | $ 120,711 us-gaap_Assets / us-gaap_StatementGeographicalAxis = us-gaap_AsiaPacificMember | $ 119,803 us-gaap_Assets / us-gaap_StatementGeographicalAxis = us-gaap_AsiaPacificMember

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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.18) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 18 -Article 5 + Details
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Period Type: | instant

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- Details
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- Details
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- Details
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