Commitments and Contingencies - Additional Information (Detail)	3 Months Ended				9 Months Ended
	Sep. 30, 2018 USD ($) Facility	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) Facility property	Jun. 06, 2018 USD ($)
Commitments And Contingencies [Line Items]
Bank guarantees related to appeals on income tax and indirect tax cases					$ 13,500,000
Available lines of credit	$ 102,800,000				$ 102,800,000
Duration as potentially responsible party, years					20 years
Number of facilities under potentially responsible party investigation | property					8
Property, Plant and Equipment, Net	874,817,000		$ 880,580,000		$ 874,817,000
Bank guarantees and pledged assets to pursue defenses related to other contingencies					24,000,000
Loss contingency accrual for the period	4,800,000
Additional litigation reserve				$ 1,000,000
Product liability					5,000,000
Settlement of claim			3,000,000		16,000,000
Product Liability Contingency, Loss Exposure in Excess of Accrual, Amount Paid		$ 13,000,000
Product Liability Contingency, Loss Exposure in Excess of Accrual, Best Estimate					1,500,000
Reimbursement to supplier	9,800,000
Bank guarantees and standby letters of credit [Member]
Commitments And Contingencies [Line Items]
Bank guarantees and letters of credit outstanding					49,600,000
Pledged assets [Member]
Commitments And Contingencies [Line Items]
The amount of pledged assets, principally PP&E to cover income tax and indirect tax assessments					10,500,000
Reserve for Environmental Costs [Member]
Commitments And Contingencies [Line Items]
Estimation of possible loss	5,000,000				5,000,000
Damages from Product Defects [Member]
Commitments And Contingencies [Line Items]
Additional litigation reserve	17,500,000				17,500,000
CHINA
Commitments And Contingencies [Line Items]
Property, Plant and Equipment, Net	$ 162,000,000				$ 162,000,000
Number of facilities | Facility	5				5
Number of facilities under construction | Facility	1				1
Guangzhou Flavors Plant [Member] | CHINA
Commitments And Contingencies [Line Items]
Property, Plant and Equipment, Net	$ 67,000,000				$ 67,000,000
Zhejiang Ingredients Plant [Member]
Commitments And Contingencies [Line Items]
Gain Contingency, Expected Relocation Payments			50,000,000
Gain Contingency, Relocation Payments Received	0		15,000,000
Zhejiang Ingredients Plant [Member] | CHINA
Commitments And Contingencies [Line Items]
Property, Plant and Equipment, Net	$ 21,000,000				$ 21,000,000
Minimum
Commitments And Contingencies [Line Items]
Estimation of possible loss			0
Maximum
Commitments And Contingencies [Line Items]
Estimation of possible loss			$ 12,000,000
ZoomEssence [Member]
Commitments And Contingencies [Line Items]
Payments for legal settlements				$ 56,000,000
Amended credit facility | Citibank, N.A.
Commitments And Contingencies [Line Items]
Line of credit facility, maximum borrowing capacity						$ 1,000,000,000