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Business Acquisitions - Additional Information (Detail)
$ in Thousands
12 Months Ended
Jan. 10, 2019
USD ($)
Business
Dec. 31, 2018
USD ($)
Productline
Mar. 31, 2019
USD ($)
Business Acquisition [Line Items]      
Goodwill   $ 25,790 $ 39,159
Agrovant and Defensive      
Business Acquisition [Line Items]      
Number of businesses acquired | Business 2    
Business combination, cash consideration $ 20,682    
Business combination, cash acquired 982    
Business combination, deferred consideration paid 2,645    
Business combination, liabilities assumed 17,040    
Business combination, liabilities assumed, tax 10,098    
Business combination, total consideration 40,370    
Goodwill 14,211    
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 3,385    
Agrovant and Defensive | Product Registrations and Product Rights      
Business Acquisition [Line Items]      
Business combination, preliminary allocation purchase price of intangible assets 9,451    
Agrovant and Defensive | Trade Name      
Business Acquisition [Line Items]      
Business combination, preliminary allocation purchase price of intangible assets 1,733    
Agrovant and Defensive | 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