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Borrowings - Components of Debt (Detail) (USD $)
In Thousands, unless otherwise specified
0 Months Ended 12 Months Ended
Apr. 04, 2013
Dec. 31, 2014
Dec. 31, 2013
Debt Instrument [Line Items]      
Total debt   $ 942,322us-gaap_LongTermDebt $ 932,814us-gaap_LongTermDebt
Less: Current portion of long-term debt   (8,090)us-gaap_LongTermDebtCurrent (149)us-gaap_LongTermDebtCurrent
Long-term debt, noncurrent   934,232us-gaap_LongTermDebtNoncurrent 932,665us-gaap_LongTermDebtNoncurrent
Senior Notes - 2007 [Member]      
Debt Instrument [Line Items]      
Rate   6.40%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= iff_SeniorNotesInTwoThousandSevenMember
 
Credit facilities   500,000us-gaap_SeniorLongTermNotes
/ us-gaap_LongtermDebtTypeAxis
= iff_SeniorNotesInTwoThousandSevenMember
500,000us-gaap_SeniorLongTermNotes
/ us-gaap_LongtermDebtTypeAxis
= iff_SeniorNotesInTwoThousandSevenMember
Senior Notes - 2007 [Member] | Minimum [Member]      
Debt Instrument [Line Items]      
Maturities   2017  
Senior Notes - 2007 [Member] | Maximum [Member]      
Debt Instrument [Line Items]      
Maturities   2027  
Senior Notes - 2006 [Member]      
Debt Instrument [Line Items]      
Rate   6.14%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= iff_SeniorNotesInTwoThousandSixMember
 
Maturities   2016  
Credit facilities   125,000us-gaap_SeniorLongTermNotes
/ us-gaap_LongtermDebtTypeAxis
= iff_SeniorNotesInTwoThousandSixMember
125,000us-gaap_SeniorLongTermNotes
/ us-gaap_LongtermDebtTypeAxis
= iff_SeniorNotesInTwoThousandSixMember
Senior Notes - 2013 [Member]      
Debt Instrument [Line Items]      
Rate 3.20%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= iff_SeniorNotesInTwoThousandThirteenMember
3.20%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= iff_SeniorNotesInTwoThousandThirteenMember
 
Debt Instrument, Maturity Date May 01, 2023    
Maturities   2023  
Credit facilities   299,782us-gaap_SeniorLongTermNotes
/ us-gaap_LongtermDebtTypeAxis
= iff_SeniorNotesInTwoThousandThirteenMember
299,736us-gaap_SeniorLongTermNotes
/ us-gaap_LongtermDebtTypeAxis
= iff_SeniorNotesInTwoThousandThirteenMember
Bank overdrafts and other [Member]      
Debt Instrument [Line Items]      
Bank overdrafts and other   12,335us-gaap_ShortTermBorrowings
/ us-gaap_LongtermDebtTypeAxis
= iff_BankBorrowingsAndOverdraftsMember
984us-gaap_ShortTermBorrowings
/ us-gaap_LongtermDebtTypeAxis
= iff_BankBorrowingsAndOverdraftsMember
Deferred realized gains on interest rate swaps [Member]      
Debt Instrument [Line Items]      
Deferred realized gains on interest rate swaps   $ 5,205us-gaap_OtherLongTermDebtNoncurrent
/ us-gaap_LongtermDebtTypeAxis
= iff_DeferredRealizedGainsOnInterestRateSwapsMember
$ 7,094us-gaap_OtherLongTermDebtNoncurrent
/ us-gaap_LongtermDebtTypeAxis
= iff_DeferredRealizedGainsOnInterestRateSwapsMember