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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 |  |  |  |  |  |  |

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