XML 85 R75.htm IDEA: XBRL DOCUMENT
v3.19.2

Financial Instruments - Derivative Instruments Notional Amount Outstanding (Detail) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Forward Contracts [Member] |  |
Schedule Of Information By Major Category Of Credit Derivatives Contracts [Line Items] |  |
Derivative instruments outstanding | $ 394,538 | $ 585,581
Currency Swap [Member] |  |
Schedule Of Information By Major Category Of Credit Derivatives Contracts [Line Items] |  |
Derivative instruments outstanding | $ 600,000 | $ 600,000

X
- Definition Schedule Of Information By Major Category Of Credit Derivatives Contracts [Line Items] + References No definition available. + Details
Name: | iff_ScheduleOfInformationByMajorCategoryOfCreditDerivativesContractsLineItems
Namespace Prefix: | iff_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
Name: | invest_DerivativeNotionalAmount
Namespace Prefix: | invest_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_ForwardContractsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_CurrencySwapMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |