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Goodwill and Other Intangible Assets, Net - Schedule of Goodwill by Operating Segment (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Sep. 30, 2019 | Dec. 31, 2018 | Oct. 04, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | --- | --- | ---
Goodwill [Line Items] |  |  |  |  |  |
Goodwill | $ 5,497,596 |  | $ 5,378,388 |  | $ 1,156,288 | $ 1,000,123
Flavors [Member] |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Goodwill | 527,785 |  | 525,060 |  |  |
Fragrances [Member] |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Goodwill | 623,373 |  | 618,878 |  |  |
Unallocated [Member] |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Goodwill | 0 |  | 10,440 |  |  |
Frutarom Industries Ltd. [Member] |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Goodwill | $ 4,346,438 | $ 4,273,957 | $ 4,224,010 | $ 4,243,079 |  |

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
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