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