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Restructuring and Other Charges, Net - Additional Information (Detail) (USD $)
3 Months Ended 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Restructuring Cost and Reserve [Line Items]      
Restructuring charge $ 187,000us-gaap_RestructuringCharges $ 122,000us-gaap_RestructuringCharges  
Fragrance Ingredients Rationalization [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring charge 187,000us-gaap_RestructuringCharges
/ us-gaap_RestructuringPlanAxis
= iff_FragranceIngredientsRationalizationMember
  13,800,000us-gaap_RestructuringCharges
/ us-gaap_RestructuringPlanAxis
= iff_FragranceIngredientsRationalizationMember
Restructuring, personnel-related costs     2,200,000us-gaap_SeveranceCosts1
/ us-gaap_RestructuringPlanAxis
= iff_FragranceIngredientsRationalizationMember
Restructuring, accelerated depreciation of fixed assets     10,300,000us-gaap_RestructuringReserveAcceleratedDepreciation
/ us-gaap_RestructuringPlanAxis
= iff_FragranceIngredientsRationalizationMember
Restructuring, plant shutdown and other related costs 200,000iff_RestructuringReservePlantShutdownAndOtherRelatedCosts
/ us-gaap_RestructuringPlanAxis
= iff_FragranceIngredientsRationalizationMember
   
Expected number of positions eliminated 43us-gaap_RestructuringAndRelatedCostExpectedNumberOfPositionsEliminated
/ us-gaap_RestructuringPlanAxis
= iff_FragranceIngredientsRationalizationMember
   
Facility Closing [Member] | Fragrance Ingredients Rationalization [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring Costs     $ 1,300,000us-gaap_RestructuringCosts
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_FacilityClosingMember
/ us-gaap_RestructuringPlanAxis
= iff_FragranceIngredientsRationalizationMember