Segment Information - Capital Expenditure and Depreciation and Amortization by Segment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Capital Expenditures	$ 235,978	$ 170,094	$ 128,973
Depreciation and amortization	323,330	173,792	117,967
Operating Segments [Member] | Flavors [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	80,267	70,028	68,937
Depreciation and amortization	56,674	54,534	53,534
Operating Segments [Member] | Fragrances [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	92,077	82,206	53,089
Depreciation and amortization	65,386	64,018	59,951
Operating Segments [Member] | Frutarom Industries Ltd. [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	55,356	12,878
Depreciation and amortization	194,956	47,738
Unallocated assets [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	8,278	4,982	6,947
Depreciation and amortization	$ 6,314	$ 7,502	$ 4,482