Segment Information - Reportable Segment Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Net sales:
Net sales	$ 930,928	$ 828,293
Segment profit:
Restructuring and other charges, net	(717)	(10,143)
Gain on sales of fixed assets	69	21
Tax assessment		(5,400)
Operating profit	174,856	130,065
Interest expense	(16,595)	(12,807)
Other income, net	576	21,229
Income before taxes	158,837	138,487
Flavor Compounds
Net sales:
Net sales	449,019	406,164
Segment profit:
Operating profit	111,564	94,556
Fragrances [Member]
Net sales:
Net sales	481,909	422,129
Segment profit:
Operating profit	93,277	77,875
Global expenses [Member]
Segment profit:
Operating profit	(23,825)	(16,293)
Corporate and Other [Member]
Segment profit:
Restructuring and other charges, net	(1,026)	(621)
Acquisition and related costs	514	(8,788)
Operational improvement initiative costs	0	(1,192)
Gain on sales of fixed assets	0	(5,350)
Tax assessment	(717)	(10,143)
Integration-related costs	69	21
FDA mandated product recall	$ (5,000)	$ 0