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Stock Compensation Plans - Additional Information (Detail)
12 Months Ended 1 Months Ended
Dec. 31, 2014
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2015
2008-2010 Cycle (Cycle VIII) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Percentage of target dollar value of the award converted to a number of notional shares 50.00%iff_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfTargetDollarValueOfAwardIsConvertedToNumberOfNotionalSharesWhenAwardIsGranted
/ us-gaap_PlanNameAxis
= iff_TwoThousandEightToTwoThousandTenCycleMember
     
Long-Term Incentive Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Target payout percentage, cash 50.00%iff_TargetPayoutCash
/ us-gaap_PlanNameAxis
= iff_LongTermIncentivePlanMember
     
Target payout percentage, stock 50.00%iff_TargetPayoutStock
/ us-gaap_PlanNameAxis
= iff_LongTermIncentivePlanMember
     
Vesting period, in years 3 years      
2010-2012 Cycle [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares of common stock issued   65,735us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation
/ us-gaap_PlanNameAxis
= iff_TwoThousandTenToTwoThousandTwelveCycleMember
119,561us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation
/ us-gaap_PlanNameAxis
= iff_TwoThousandTenToTwoThousandTwelveCycleMember
 
2010 Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares authorized for issuance 2,749,669us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= iff_TwoThousandTenPlanMember
     
Shares remaining available for issuance 749,669us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= iff_TwoThousandTenPlanMember
     
Shares subject to outstanding awards 1,206,380iff_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesSubjectToOutstandingAwards
/ us-gaap_PlanNameAxis
= iff_TwoThousandTenPlanMember
     
Shares remaining available for future awards 1,546,494iff_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= iff_TwoThousandTenPlanMember
     
RSU's [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period, in years 3 years      
Each twelve-month period [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting percentage 25.00%iff_SharebasedCompensationArrangementbySharebasedPaymentAwardAwardVestingPercentage
/ us-gaap_VestingAxis
= iff_EachTwelveMonthPeriodMember
     
Full three-year period [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting percentage 25.00%iff_SharebasedCompensationArrangementbySharebasedPaymentAwardAwardVestingPercentage
/ us-gaap_VestingAxis
= iff_FullThreeYearPeriodMember
     
Scenario, Forecast [Member] | 2010-2012 Cycle [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares of common stock issued       90,062us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation
/ us-gaap_PlanNameAxis
= iff_TwoThousandTenToTwoThousandTwelveCycleMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember