Commitments and Contingencies - Additional Information (Detail)	1 Months Ended	3 Months Ended			6 Months Ended
	Aug. 07, 2018 USD ($)	Jun. 30, 2018 USD ($) Facility	Dec. 31, 2017 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) Facility property
Commitments And Contingencies [Line Items]
Bank guarantees related to appeals on income tax and indirect tax cases					$ 13,500,000
Available lines of credit		$ 102,300,000			$ 102,300,000
Duration as potentially responsible party, years					20 years
Number of facilities under potentially responsible party investigation | property					8
Property, Plant and Equipment, Net		867,629,000	$ 880,580,000		$ 867,629,000
Bank guarantees and pledged assets to pursue defenses related to other contingencies					24,700,000
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
Bank guarantees and standby letters of credit [Member]
Commitments And Contingencies [Line Items]
Bank guarantees and letters of credit outstanding					49,400,000
Pledged assets [Member]
Commitments And Contingencies [Line Items]
The amount of pledged assets, principally PP&E to cover income tax and indirect tax assessments					11,200,000
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		$ 161,000,000			$ 161,000,000
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		$ 71,000,000			$ 71,000,000
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		$ 23,000,000			$ 23,000,000
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
Subsequent Event
Commitments And Contingencies [Line Items]
Reimbursement to supplier	$ 9,800,000