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Financial Instruments - Additional Information (Detail) (USD $)
3 Months Ended 12 Months Ended
Jun. 30, 2014
Mar. 31, 2014
Agreement
Dec. 31, 2014
Apr. 04, 2013
Derivatives, Fair Value [Line Items]        
Number of interest rate swap agreements   3iff_NumberOfInterestRateSwapAgreements    
Loss incurred on termination of interest rate swaps $ 2,700,000iff_DeferredGainLossOnTerminatedInterestRateContracts      
Derivative gains included in AOCI     7,000,000us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths  
Cross Currency Swap [Member]        
Derivatives, Fair Value [Line Items]        
Derivative instrument maturity period (years)     10 years  
Forward Currency Contracts [Member]        
Derivatives, Fair Value [Line Items]        
Number of multiple forward currency contracts matured     6iff_NumberOfForwardCurrencyContractsThatMaturedDuringPeriod
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForwardContractsMember
 
Senior Notes - 2013 [Member]        
Derivatives, Fair Value [Line Items]        
Senior notes       $ 300,000,000.0us-gaap_SeniorNotes
/ us-gaap_LongtermDebtTypeAxis
= iff_SeniorNotesInTwoThousandThirteenMember