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Restructuring and Other Charges, Net - Changes in Employee-Related Restructuring Liabilities (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2017
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
Beginning Balance |  |  | $ 21,085 |  |  |
Additional Charges (Reversals), Net |  |  | 6,802 |  |  |
Non-Cash Charges |  |  | (3,794) |  |  |
Additional charges, net | $ 1,884 | $ 2,525 | 6,802 | $ 18,699 |  |
Payments |  |  | (6,345) |  |  |
Ending Balance | 17,748 |  | 17,748 |  | $ 21,085 |
2017 Productivity Program |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
Additional charges, net |  |  |  |  |  | $ 24,500
2017 Productivity Program | Employee Severance |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
Beginning Balance |  |  | 1,106 |  |  |
Additional Charges (Reversals), Net |  |  | 0 |  |  |
Non-Cash Charges |  |  | 0 |  |  |
Payments |  |  | (217) |  |  |
Ending Balance | 889 |  | 889 |  | 1,106 |
2017 Productivity Program | Other |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
Beginning Balance |  |  | 88 |  |  |
Additional Charges (Reversals), Net |  |  | 0 |  |  |
Non-Cash Charges |  |  | 0 |  |  |
Payments |  |  | 0 |  |  |
Ending Balance | 88 |  | 88 |  | 88 |
Frutarom Integration Initiative | Employee Severance |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
Beginning Balance |  |  | 4,038 |  |  |
Additional Charges (Reversals), Net |  |  | 1,737 |  |  |
Non-Cash Charges |  |  | 0 |  |  |
Additional charges, net |  |  | 17,200 |  |  |
Payments |  |  | (2,390) |  |  |
Ending Balance | 3,385 |  | 3,385 |  | 4,038 |
Frutarom Integration Initiative | Fixed Asset Write Down [Member] |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
Beginning Balance |  |  | 0 |  |  |
Additional Charges (Reversals), Net |  |  | 3,766 |  |  |
Non-Cash Charges |  |  | (3,766) |  |  |
Payments |  |  | 0 |  |  |
Ending Balance | 0 |  | 0 |  | 0 |
Frutarom Integration Initiative | Other |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
Beginning Balance |  |  | 2,485 |  |  |
Additional Charges (Reversals), Net |  |  | 1,299 |  |  |
Non-Cash Charges |  |  | (28) |  |  |
Payments |  |  | (325) |  |  |
Ending Balance | 3,431 |  | 3,431 |  | 2,485 |
2019 Severance Initiatives | Employee Severance |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
Beginning Balance |  |  | 12,897 |  |  |
Additional Charges (Reversals), Net |  |  | 0 |  |  |
Non-Cash Charges |  |  | 0 |  |  |
Additional charges, net |  |  |  |  | 21,300 |
Payments |  |  | (3,413) |  |  |
Ending Balance | 9,484 |  | 9,484 |  | 12,897 |
2019 Severance Initiatives | Other |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
Beginning Balance |  |  | 471 |  |  |
Additional Charges (Reversals), Net |  |  | 0 |  |  |
Non-Cash Charges |  |  | 0 |  |  |
Payments |  |  | 0 |  |  |
Ending Balance | 471 |  | 471 |  | $ 471 |
Taste |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
Additional charges, net | 1,884 | 2,525 | 6,802 | 5,078 |  |
Scent [Member] |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
Additional charges, net | 0 | 0 | 0 | 10,900 |  |
Shared IT & Corporate Costs [Member] |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
Additional charges, net | $ 0 | $ 0 | $ 0 | $ 2,721 |  |

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