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Business and Asset Acquisitions - Additional Information (Detail) $ in Thousands			3 Months Ended	9 Months Ended	12 Months Ended
	Jul. 01, 2019 USD ($)	Jan. 10, 2019 USD ($) Business	Sep. 30, 2019 USD ($)	Sep. 30, 2019 USD ($)	Dec. 31, 2018 USD ($) Productline
Business Acquisition [Line Items]
Business combination, cash consideration	$ 7,293
Business combination, liabilities assumed	$ 300
Goodwill			$ 38,435	$ 38,435	$ 25,790
Defensive and Agrovant
Business Acquisition [Line Items]
Number of businesses acquired | Business		2
Business combination, cash consideration		$ 20,679	$ 30	$ 838
Business combination, cash acquired		981
Business combination, deferred consideration paid		2,659
Business combination, liabilities assumed		17,083
Business combination, liabilities assumed, tax		10,112
Business combination, total consideration		40,424
Goodwill		14,268
Business combination, preliminary allocation of purchase price, working capital		8,072
Business combination, preliminary allocation purchase price, fixed assets		404
Business combination, preliminary allocation purchase price, indemnification assets		3,384
Defensive and Agrovant | Product Registrations and Product Rights
Business Acquisition [Line Items]
Business combination, preliminary allocation purchase price of intangible assets		9,449
Defensive and Agrovant | Trade Name
Business Acquisition [Line Items]
Business combination, preliminary allocation purchase price of intangible assets		1,733
Defensive and Agrovant | Customer Relationships
Business Acquisition [Line Items]
Business combination, preliminary allocation purchase price of intangible assets		$ 3,114
E.I DuPont et Nemour | Product Lines Acquisition
Business Acquisition [Line Items]
Business combination, cash consideration					$ 3,564
Business combination, number of product lines acquired | Productline					1

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