Segment Information - Reportable Segment Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Net sales	$ 3,977,539	$ 3,398,719	$ 3,116,350
Segment assets	12,889,395	4,598,926
Operating profit	583,882	552,630	552,955
Legal Charges/Credits, net	0	56,000	0
Restructuring and Other Charges, net	(5,079)	(19,711)	1,042
Gain on Sale of Assets	1,177	184	10,836
UK Pension Settlement Charges	8,000
Interest expense	(132,558)	(65,363)	(52,989)
Loss on extinguishment of debt	(38,810)	0	0
Other income (expense), net	35,243	49,778	23,751
Income before taxes	447,757	537,045	523,717
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Operational Improvement Initiatives	(2,169)	(1,802)	(2,402)
Acquisition Related Costs	1,289	(20,389)	(12,195)
Integration Related Costs	(7,188)	(4,179)	0
Legal Charges/Credits, net	0	(1,000)	(48,518)
Tax assessment	0	(5,331)	0
Restructuring and Other Charges, net	(4,086)	(19,711)	(322)
Gain on Sale of Assets	1,177	184	7,818
FDA Mandated Product Recall	0	(2,769)	0
UK Pension Settlement Charges	$ (89,632)	$ 0	$ 0
Operating Segments [Member]
Segment Reporting Information [Line Items]
Profit margin	14.70%	16.30%	17.70%
Operating Segments [Member] | Flavors [Member]
Segment Reporting Information [Line Items]
Net sales	$ 1,737,349	$ 1,632,166	$ 1,496,525
Segment assets	2,024,573	1,929,005
Operating profit	$ 395,190	$ 360,483	$ 330,221
Profit margin	22.70%	22.10%	22.10%
Operating Segments [Member] | Fragrances [Member]
Segment Reporting Information [Line Items]
Net sales	$ 1,880,630	$ 1,766,553	$ 1,619,825
Segment assets	2,340,131	2,284,309
Operating profit	$ 329,548	$ 318,954	$ 326,705
Profit margin	17.50%	18.10%	20.20%
Operating Segments [Member] | Frutarom Industries Ltd. [Member]
Segment Reporting Information [Line Items]
Net sales	$ 359,560	$ 0	$ 0
Segment assets	7,961,538	0
Operating profit	$ 27,358	$ 0	$ 0
Profit margin	7.60%	0.00%	0.00%
Global [Member]
Segment Reporting Information [Line Items]
Segment assets	$ 563,153	$ 385,612
Operating profit	(74,730)	(60,810)	$ (48,352)
Frutarom Industries Ltd. [Member]
Segment Reporting Information [Line Items]
Acquisition Related Costs	(156,700)
Loss on extinguishment of debt	3,900
Amortization	23,500
Debt related commitment fees and debt issuance costs	39,400
Expected make-whole payments for early debt payoff	34,900
Realized gain on foreign currency derivative	12,500
Transaction costs	66,000
Acquisition-related Costs [Member]
Segment Reporting Information [Line Items]
Operating profit	$ 7,125	$ (11,000)	$ 0