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Long-Term Debt - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Apr. 22, 2020
Mar. 31, 2021
Dec. 31, 2020
Jun. 30, 2017
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]                
Principal payments on long -term debt due in 2022     $ 107,900,000     $ 107,900,000    
Proposed acquisition of consideration           $ 36,917,000 $ 60,904,000 $ 27,283,000
Senior Secured Revolving Line of Credit                
Debt Instrument [Line Items]                
Senior secured credit facility, maturity date       Jun. 30, 2022        
Credit agreement, covenant description           The revolving line of credit agreement (the “Credit Agreement”) is a senior secured lending facility among AMVAC, the Company’s principal operating subsidiary, as borrower, and affiliates (including the Company, AMVAC CV and AMVAC BV), as guarantors and/or borrowers, on the one hand, and a group of commercial lenders led by Bank of the West as agent, swing line lender and Letter of Credit issuer on the other hand, consisting of a line of credit of up to $250,000, an accordion feature of up to $100,000 and a maturity date of June 30, 2022. The Credit Agreement contains two key financial covenants; namely, borrowers are required to maintain a Consolidated Funded Debt Ratio of no more than 3.25-to-1 and a Consolidated Fixed Charge Covenant Ratio of at least 1.25-to-1.    
Credit agreement, variable rate description           Under the Credit Agreement, revolving loans bear interest at a variable rate based, at borrower’s election with proper notice, on either (i) LIBOR plus the “Applicable Rate” which is based upon the Consolidated Funded Debt Ratio (“Eurocurrency Rate Loan”) or (ii) the greater of (x) the Prime Rate, (y) the Federal Funds Rate plus 0.5%, and (z) the Daily One-Month LIBOR Rate plus 1.00%, plus, in the case of (x), (y) or (z) the Applicable Rate (“Alternate Base Rate Loan”)    
Credit agreement, interest rate     2.75%     2.75%    
Federal Funds Rate | Senior Secured Revolving Line of Credit                
Debt Instrument [Line Items]                
Credit agreement, variable rate basis       0.50%        
One-Month LIBOR Rate | Senior Secured Revolving Line of Credit                
Debt Instrument [Line Items]                
Credit agreement, variable rate basis       1.00%        
Eurocurrency Rate | Senior Secured Revolving Line of Credit                
Debt Instrument [Line Items]                
Credit agreement, interest payment period, description           last day of each interest period (either one, two, three or six months, as selected by the borrower)    
Alternate Base Rate | Senior Secured Revolving Line of Credit                
Debt Instrument [Line Items]                
Credit agreement, interest payment period, description           last business day of each month    
Credit Agreement | Senior Secured Revolving Line of Credit                
Debt Instrument [Line Items]                
Available borrowings capacity under credit agreement             $ 26,977,000  
Consolidated funded debt ratio 325.00%   375.00%   400.00%      
Consolidated funded debt thereafter ratio 325.00%              
Proposed acquisition of consideration $ 15,000,000              
Business combination consideration term 90 days              
Credit Agreement | Senior Secured Revolving Line of Credit | Forecast                
Debt Instrument [Line Items]                
Consolidated funded debt ratio   350.00%            
Maximum | Senior Secured Revolving Line of Credit                
Debt Instrument [Line Items]                
Available borrowings capacity under credit agreement       $ 250,000,000        
Consolidated funded debt ratio       325.00%        
Maximum | Term Loan                
Debt Instrument [Line Items]                
Accordion feature       $ 100,000,000        
Maximum | Credit Agreement | Senior Secured Revolving Line of Credit                
Debt Instrument [Line Items]                
Consolidated funded debt ratio 425.00%              
Proposed acquisition of consideration $ 50,000,000              
Capacity to increase borrowings under credit agreement     $ 86,736,000     $ 86,736,000    
Minimum                
Debt Instrument [Line Items]                
Consolidated fixed charge covenant ratio       125.00%        
Minimum | Credit Agreement | Senior Secured Revolving Line of Credit                
Debt Instrument [Line Items]                
Consolidated funded debt ratio 50.00%              
Proposed acquisition of consideration $ 30,000,000