Segment Information - Capital Expenditure and Depreciation and Amortization by Segment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Capital Expenditures	$ 128,973	$ 126,412	$ 101,030
Depreciation and amortization	117,967	102,469	89,597
Operating Segments [Member] | Flavors [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	68,937	47,064	39,416
Depreciation and amortization	53,534	47,705	45,228
Operating Segments [Member] | Fragrances [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	53,089	73,345	50,597
Depreciation and amortization	59,951	50,724	39,614
Unallocated assets [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	6,947	6,003	11,017
Depreciation and amortization	$ 4,482	$ 4,040	$ 4,755