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Segment Information - Net Sales by Geographic Area (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Segment Reporting Information [Line Items]      
Net sales $ 3,088,533us-gaap_SalesRevenueGoodsNet $ 2,952,896us-gaap_SalesRevenueGoodsNet $ 2,821,446us-gaap_SalesRevenueGoodsNet
Europe, Africa and Middle East [Member]      
Segment Reporting Information [Line Items]      
Net sales 1,041,585us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementGeographicalAxis
= iff_EuropeAfricaAndMiddleEastMember		 971,921us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementGeographicalAxis
= iff_EuropeAfricaAndMiddleEastMember		 912,768us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementGeographicalAxis
= iff_EuropeAfricaAndMiddleEastMember
Greater Asia [Member]      
Segment Reporting Information [Line Items]      
Net sales 856,217us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementGeographicalAxis
= iff_GreaterAsiaMember		 823,504us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementGeographicalAxis
= iff_GreaterAsiaMember		 771,877us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementGeographicalAxis
= iff_GreaterAsiaMember
North America [Member]      
Segment Reporting Information [Line Items]      
Net sales 690,214us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementGeographicalAxis
= us-gaap_NorthAmericaMember		 680,840us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementGeographicalAxis
= us-gaap_NorthAmericaMember		 694,430us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementGeographicalAxis
= us-gaap_NorthAmericaMember
Latin America [Member]      
Segment Reporting Information [Line Items]      
Net sales $ 500,517us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementGeographicalAxis
= us-gaap_LatinAmericaMember		 $ 476,631us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementGeographicalAxis
= us-gaap_LatinAmericaMember		 $ 442,371us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementGeographicalAxis
= us-gaap_LatinAmericaMember