Segment Information - Reportable Segment Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Net sales:
Net sales	$ 1,267,345	$ 907,548	$ 3,856,315	$ 2,758,492
Segment profit:
Restructuring and other charges, net	(3,716)	(927)	(22,415)	(2,830)
Gain on sales of fixed assets	(372)	1,630	(1,136)	435
Operating profit	184,664	159,268	548,471	488,633
Interest expense	(33,497)	(23,914)	(102,662)	(93,755)
Other income (expense)	5,699	4,158	15,114	25,389
Income before taxes	156,866	100,702	460,923	381,457
Frutarom
Segment profit:
Restructuring and other charges, net	(2,453)	0	(7,290)	0
Corporate and Other
Segment profit:
Operational improvement initiative costs	(712)	(344)	(1,652)	(1,773)
Acquisition and related costs	0	1	0	519
Integration-related costs	(10,511)	(958)	(36,825)	(1,951)
Restructuring and other charges, net	(3,716)	(927)	(22,415)	(1,837)
Gain on sales of fixed assets	(372)	1,630	(1,136)	435
Frutarom Acquisition Related Costs	(2,914)	14,341	5,182	26,796
FDA Mandated Product Recall	(3,623)	0	(3,623)	0
Operating Segments | Taste
Net sales:
Net sales	423,269	436,214	1,302,050	1,335,773
Segment profit:
Operating profit	97,526	96,497	304,062	317,666
Operating Segments | Scent
Net sales:
Net sales	480,384	471,334	1,444,407	1,422,719
Segment profit:
Operating profit	83,484	87,488	260,543	261,545
Operating Segments | Frutarom
Net sales:
Net sales	363,692	0	1,109,858	0
Segment profit:
Operating profit	28,257	0	94,841	0
Corporate, Non-Segment
Segment profit:
Operating profit	(8,333)	(19,578)	(39,892)	(63,975)
Acquisition-related Costs
Segment profit:
Operating profit	$ (250)	$ 9,800	$ (250)	$ 4,800