Segment Information - Capital Expenditure and Depreciation and Amortization by Segment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Capital Expenditures	$ 170,094	$ 128,973	$ 126,412
Depreciation and amortization	173,792	117,967	102,469
Operating Segments [Member] | Flavors [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	70,028	68,937	47,064
Depreciation and amortization	72,474	53,534	47,705
Operating Segments [Member] | Fragrances [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	82,206	53,089	73,345
Depreciation and amortization	85,078	59,951	50,724
Operating Segments [Member] | Frutarom Industries Ltd. [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	12,878	0	0
Depreciation and amortization	8,738	0	0
Unallocated assets [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	4,982	6,947	6,003
Depreciation and amortization	$ 7,502	$ 4,482	$ 4,040