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Accumulated Other Comprehensive Income (Loss) - Reclassifications of Accumulated Other Comprehensive Income to Consolidated Statement of Comprehensive Income (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Schedule Of Reclassification Of Accumulated Other Comprehensive Income Loss [Line Items]    
(Losses) gains on derivatives qualifying as hedges, net of tax $ (3,949)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax $ (1,162)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax
Settlements/Curtailments (43)us-gaap_OtherComprehensiveIncomeLossFinalizationOfPensionAndNonPensionPostretirementPlanValuationBeforeTax [1] (215)us-gaap_OtherComprehensiveIncomeLossFinalizationOfPensionAndNonPensionPostretirementPlanValuationBeforeTax [1]
Prior service cost (63)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax [1] (319)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax [1]
Actuarial losses (28,219)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax [1] (33,618)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax [1]
(Losses) gains on pension and postretirement liability adjustments, net of tax (16,877)iff_OtherComprehensiveIncomeLossReclassificationAdjustmentOnPensionAndOtherPostretirementBenefitPlansIncludedInNetIncomeNetOfTax (20,925)iff_OtherComprehensiveIncomeLossReclassificationAdjustmentOnPensionAndOtherPostretirementBenefitPlansIncludedInNetIncomeNetOfTax
Other (income) expense, net [Member] | Cross Currency Swap [Member]    
Schedule Of Reclassification Of Accumulated Other Comprehensive Income Loss [Line Items]    
(Losses) gains on derivatives qualifying as hedges 0us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CurrencySwapMember
/ us-gaap_IncomeStatementLocationAxis
= iff_OtherIncomeExpenseNetMember		 (333)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CurrencySwapMember
/ us-gaap_IncomeStatementLocationAxis
= iff_OtherIncomeExpenseNetMember
Cost of goods sold [Member] | Foreign currency contracts [Member]    
Schedule Of Reclassification Of Accumulated Other Comprehensive Income Loss [Line Items]    
(Losses) gains on derivatives qualifying as hedges (4,426)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_IncomeStatementLocationAxis
= iff_CostOfGoodsSoldMember		 (861)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_IncomeStatementLocationAxis
= iff_CostOfGoodsSoldMember
Interest expense [Member] | Interest Rate Swaps [Member]    
Schedule Of Reclassification Of Accumulated Other Comprehensive Income Loss [Line Items]    
(Losses) gains on derivatives qualifying as hedges (274)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InterestExpenseMember		 (205)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InterestExpenseMember
Provision for income taxes [Member]    
Schedule Of Reclassification Of Accumulated Other Comprehensive Income Loss [Line Items]    
Provision for income taxes for (Losses) gains on derivatives qualifying as hedges 751us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax
/ us-gaap_IncomeStatementLocationAxis
= iff_ProvisionForIncomeTaxesMember		 237us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax
/ us-gaap_IncomeStatementLocationAxis
= iff_ProvisionForIncomeTaxesMember
Provision for income taxes for gains (Losses) on pension and postretirement liability adjustments $ 11,448iff_OtherComprehensiveIncomeLossReclassificationAdjustmentOnPensionAndOtherPostretirementBenefitPlansIncludedInNetIncomeTax
/ us-gaap_IncomeStatementLocationAxis
= iff_ProvisionForIncomeTaxesMember		 $ 13,227iff_OtherComprehensiveIncomeLossReclassificationAdjustmentOnPensionAndOtherPostretirementBenefitPlansIncludedInNetIncomeTax
/ us-gaap_IncomeStatementLocationAxis
= iff_ProvisionForIncomeTaxesMember
[1] The amortization of prior service cost and actuarial loss is included in the computation of net periodic benefit cost. Refer to Note 13 to the Consolidated Financial Statements - Employee Benefits for additional information regarding net periodic benefit cost.