XML 59 R132.htm IDEA: XBRL DOCUMENT
v3.19.3.a.u2

Financial Instruments - Derivative Instruments Notional Amount Outstanding (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Forward Currency Contracts [Member] |  |
Schedule Of Information By Major Category Of Credit Derivatives Contracts [Line Items] |  |
Derivative instruments outstanding | $ 473,600 | $ 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 Nominal or face amount used to calculate payment on derivative. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959 + Details
Name: | us-gaap_DerivativeNotionalAmount
Namespace Prefix: | us-gaap_
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: |