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v2.4.1.9

Summary of Differences Between Income Tax Expense Computed at Statutory Federal Income Tax Rate and Per Consolidated Statements of Income (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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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
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Tax expense at federal rate of 35% |  |  |  |  |  |  |  |  | $ 34,569 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | $ 32,606 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | $ 22,844 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
State income taxes, net of federal benefit |  |  |  |  |  |  |  |  | (544)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes | 675 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes | 655 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Change in valuation allowance |  |  |  |  |  |  |  |  | 3,521 us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance | (1,615)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance | (2,680)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Foreign tax rate differential |  |  |  |  |  |  |  |  | (5,508)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential | (4,650)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential | (8,940)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential
Unrecognized tax benefit increase (decrease) |  |  |  |  |  |  |  |  | 65 us-gaap_IncomeTaxReconciliationTaxContingencies | 488 us-gaap_IncomeTaxReconciliationTaxContingencies | (1,665)us-gaap_IncomeTaxReconciliationTaxContingencies
Tax effect of foreign operations |  |  |  |  |  |  |  |  | (104)aciw_TaxEffectOfForeignOperations | 5,906 aciw_TaxEffectOfForeignOperations | 5,311 aciw_TaxEffectOfForeignOperations
Acquisition Costs |  |  |  |  |  |  |  |  | 289 aciw_IncomeTaxReconciliationAcquisitionCosts | 896 aciw_IncomeTaxReconciliationAcquisitionCosts | 2,659 aciw_IncomeTaxReconciliationAcquisitionCosts
Tax benefit of research & development |  |  |  |  |  |  |  |  | (3,446)us-gaap_IncomeTaxReconciliationTaxCreditsResearch | (4,001)us-gaap_IncomeTaxReconciliationTaxCreditsResearch | (1,749)us-gaap_IncomeTaxReconciliationTaxCreditsResearch
Other |  |  |  |  |  |  |  |  | 2,367 us-gaap_IncomeTaxReconciliationOtherAdjustments | (1,014)us-gaap_IncomeTaxReconciliationOtherAdjustments | (13)us-gaap_IncomeTaxReconciliationOtherAdjustments
Income tax provision | $ 23,334 us-gaap_IncomeTaxExpenseBenefit | $ 9,433 us-gaap_IncomeTaxExpenseBenefit | $ 2,409 us-gaap_IncomeTaxExpenseBenefit | $ (3,967)us-gaap_IncomeTaxExpenseBenefit | $ 24,108 us-gaap_IncomeTaxExpenseBenefit | $ 5,347 us-gaap_IncomeTaxExpenseBenefit | $ 2,280 us-gaap_IncomeTaxExpenseBenefit | $ (2,444)us-gaap_IncomeTaxExpenseBenefit | $ 31,209 us-gaap_IncomeTaxExpenseBenefit | $ 29,291 us-gaap_IncomeTaxExpenseBenefit | $ 16,422 us-gaap_IncomeTaxExpenseBenefit

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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 + Details
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- Definition The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 2 -Article 4 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other adjustments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 + Details
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