Commitments and Contingencies - Additional Information (Detail) € in Millions	3 Months Ended					12 Months Ended
	Dec. 31, 2017 USD ($) Facility	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Mar. 31, 2014 EUR (€)	Mar. 31, 2014 USD ($)	Dec. 31, 2017 USD ($) Facility	Dec. 31, 2016 USD ($)	Dec. 31, 2015 EUR (€)	Dec. 31, 2015 USD ($)
Commitments And Contingencies [Line Items]
Minimum rental payments under non-cancelable operating leases, 2017	$ 36,200,000					$ 36,200,000
Minimum rental payments under non-cancelable operating leases, 2018	33,900,000					33,900,000
Minimum rental payments under non-cancelable operating leases, 2019	30,800,000					30,800,000
Minimum rental payments under non-cancelable operating leases, 2020	29,300,000					29,300,000
Minimum rental payments under non-cancelable operating leases, from 2021 and thereafter	153,400,000					153,400,000
Rental expense						37,800,000	$ 35,400,000		$ 33,600,000
Amount still available for additional borrowings	950,000,000					950,000,000
Available lines of credit	105,400,000					$ 105,400,000
Duration as potentially responsible party, years						20 years
Number of facilities under Potentially Responsible Party investigation | Facility						8
Estimated maximum future costs of environmental liabilities for identified sites (less than $5 million)	5,000,000					$ 5,000,000
Property, plant and equipment, gross	2,090,755,000					2,090,755,000	1,913,333,000
Bank guarantees and pledged assets to pursue defenses related to other contingencies						30,700,000
Reversal of previously recorded provision		$ (1,000,000)
Recovery of litigation charges						56,000,000	0		0
Minimum [Member]
Commitments And Contingencies [Line Items]
Estimated maximum future costs of environmental liabilities for identified sites (less than $5 million)	0					0
Maximum [Member]
Commitments And Contingencies [Line Items]
Estimated maximum future costs of environmental liabilities for identified sites (less than $5 million)	15,000,000					15,000,000
China [Member]
Commitments And Contingencies [Line Items]
Property, plant and equipment, gross	$ 151,400,000					$ 151,400,000
Number of plants | Facility	5					5
Number of plants under construction | Facility	1					1
Guangzhou Flavors Plant [Member] | Guangzhou, China [Member]
Commitments And Contingencies [Line Items]
Property, plant and equipment, gross	$ 68,000,000					$ 68,000,000
Zhejiang Ingredients Plant [Member] | Zhejiang, China [Member]
Commitments And Contingencies [Line Items]
Possible compensation payments for relocation	50,000,000					50,000,000
Proceeds from compensation for relocation	15,000,000
Property, plant and equipment, gross	25,000,000					25,000,000
Pledged assets [Member]
Commitments And Contingencies [Line Items]
The amount of pledged assets, principally PP&E to cover income tax and indirect tax assessments						15,000,000
Bank guarantees and standby letters of credit [Member]
Commitments And Contingencies [Line Items]
Bank guarantees and letters of credit outstanding						51,700,000
Bank guarantees [Member]
Commitments And Contingencies [Line Items]
Bank guarantees related to appeals on income tax and indirect tax cases						15,700,000
Damages from Product Defects [Member]
Commitments And Contingencies [Line Items]
Payments for legal settlements	3,100,000
Reversal of previously recorded provision	(12,800,000)					$ (12,800,000)
Product liability accrual period expense	$ 7,500,000	3,500,000	$ 1,800,000
ZoomEssence [Member]
Commitments And Contingencies [Line Items]
Payments for legal settlements		$ 56,000,000
Spanish Capital Tax Charge [Member]
Commitments And Contingencies [Line Items]
Payments for legal settlements				€ 9.8	$ 11,200,000
Recovery of litigation charges							$ 2,300,000	€ 9.8	$ 10,500,000