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Income Taxes - Additional Information (Detail)
In Millions, unless otherwise specified
3 Months Ended 3 Months Ended
Mar. 31, 2015
USD ($)
Mar. 31, 2015
EUR (€)
Mar. 31, 2015
Spanish tax settlement [Member]
Mar. 31, 2014
Spanish tax settlement [Member]
Mar. 31, 2015
1995-2001 [Member]
USD ($)
Mar. 31, 2015
1995-2001 [Member]
EUR (€)
Mar. 31, 2015
2007-2012 [Member]
Minimum [Member]
Mar. 31, 2015
2007-2012 [Member]
Maximum [Member]
Mar. 31, 2015
Other Liabilities [Member]
USD ($)
Mar. 31, 2015
Other Current Liabilities [Member]
USD ($)
Income Taxes [Line Items]                    
Unrecognized tax benefits that would impact effective tax rate                 $ 14.8us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherLiabilitiesMember
$ 0.7us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherCurrentLiabilitiesMember
Accrued interest and penalties                 0.8us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherLiabilitiesMember
0.5us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherCurrentLiabilitiesMember
Provision for uncertain tax positions 16.8us-gaap_LiabilityForUncertainTaxPositionsNoncurrent                  
Income tax examination, years under examination             2005 2014    
Bank guarantees needed to be posted to proceed with tax appeals         5.1iff_IncomeTaxExaminationRequiredBankGuaranteesForTaxAppeals
/ us-gaap_IncomeTaxAuthorityAxis
= iff_NineteenNinetyFiveToTwoThousandOneMember
4.7iff_IncomeTaxExaminationRequiredBankGuaranteesForTaxAppeals
/ us-gaap_IncomeTaxAuthorityAxis
= iff_NineteenNinetyFiveToTwoThousandOneMember
       
Settlements 3.8us-gaap_TaxAdjustmentsSettlementsAndUnusualProvisions 3.5us-gaap_TaxAdjustmentsSettlementsAndUnusualProvisions                
Effective tax rate     18.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations
/ us-gaap_TaxCreditCarryforwardAxis
= iff_SpanishIncomeTaxMember
25.30%us-gaap_EffectiveIncomeTaxRateContinuingOperations
/ us-gaap_TaxCreditCarryforwardAxis
= iff_SpanishIncomeTaxMember
           
Tax settlement $ 10.5us-gaap_IncomeTaxReconciliationTaxSettlements