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Long-Term Debt - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |  |  |
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Mar. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2025 | Nov. 30, 2025 | Nov. 29, 2025 | Oct. 31, 2025 | Oct. 01, 2025 | Sep. 30, 2025 | Aug. 31, 2025 | Jul. 31, 2025 | Jun. 30, 2025 | Jun. 20, 2025
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal payments on long -term debt due in 2022 |  | $ 147,332 |  |  |  |  |  |  |  |  |  |  |  |
Interest expense |  | $ 16,547 | $ 12,639 | $ 3,954 |  |  |  |  |  |  |  |  |  |
Base Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit agreement, interest rate |  |  |  |  |  |  |  |  | 3.75% | 2.75% |  |  |  |
SOFR |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit agreement, interest rate |  |  |  |  |  |  |  |  | 4.75% | 3.75% |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowers Liquidity measured |  |  |  |  | $ 20,000 | $ 9,292 |  | $ 3,000 |  | $ 25,000 | $ 4,042 | $ 35,000 | $ 30,000 |
Credit Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit agreement, variable rate description |  | The Company’s borrowing capacity varies with its financial performance, measured in terms of Consolidated EBITDA as defined in the Credit Agreement, for the trailing twelve-month period. Under the Credit Agreement, revolving loans bear interest at a variable rate based, at borrower’s election with proper notice, on either (i) London Interbank Offered Rate ("LIBOR") plus the “Applicable Margin” which is based upon the Total Leverage (“TL”) Ratio (“LIBOR Revolver 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 Margin (“Adjusted Base Rate Revolver Loan”). The Company and the Lenders entered into an amendment to the Credit Agreement, effective March 9, 2023, whereby LIBOR was replaced by the Secured Overnight Financing Rate ("SOFR") with a credit spread adjustment of 10.0 bps for all SOFR periods. The revolving loans now bear interest at a variable rate based at our election with proper notice, on either (i) SOFR plus 0.1% per annum and the “Applicable Margin” or (ii) the greater of (x) the Prime Rate, (y) the Federal Funds Rate plus 0.5%, and (z) the Daily One-Month SOFR Rate plus 1.10%, plus, in the case of (x), (y) or (z) the Applicable Margin (“Adjusted Base Rate Revolver Loan”). Interest payments for SOFR Revolver Loans are payable on the last day of each interest period (either one-, three- or six- month periods, as selected by the Company) and the maturity date, while interest payments for Adjusted Base Rate Revolver Loans are payable on the last business day of each month and the maturity date. |  |  |  |  |  |  |  |  |  |  |  |
Amendment Credit Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit agreement, variable rate description |  | the Company |  |  |  |  |  |  |  |  |  |  |  |
Third Amended Loan Member |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit agreement, variable rate description |  | the Company entered into Amendment Number Eight to the Third Amended Loan and Security Agreement that provided relief in respect of both financial covenants, under which the Maximum Total Leverage Ratio was modified to 6.25 for the period ending March 31, 2025; 6.25 for the period ending June 30, 2025; 5.75 for the period ending September 30, 2025 and returning to 3.25 for the periods ending December 31, 2025 and thereafter. The Minimum Fixed Charge Coverage Ratio is changed to 1.15 for the period ending March 31, 2025, and returning to 1.25 for the period ending June 30, 2025 and thereafter. In addition, the Applicable Margins for the Revolver Loans are changed to 3.75% for SOFR and 2.75% as the Adjusted Base Rate; the Unused Line Fee Rate is 0.35% and the Letter of Credit Fee is 3.75%. Further, notwithstanding financial performance, the borrowing capacity is capped below the facility’s previous maximum ($275,000) by $50,000 through June 30, 2025, then by $40,000 through December 31, 2025, and then by $75,000 through the expiration of the facility. Finally, the definition of Consolidated EBITDA was changed to exclude non-recurring non-cash charges as well as cash charges that do not exceed various sums in various categories over the balance of the term. |  |  |  |  |  |  |  |  |  |  |  |
Eighth Amendment [Member] | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other charges |  |  |  |  | 35,000 |  |  |  |  | $ 9,500 |  |  |  | $ 4,500
Eleven To Third Amended Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Commitment | $ 275,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Eleven To Third Amended Loan [Member] | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Commitment |  |  |  |  | 225,000 | $ 200,000 | $ 245,000 |  |  |  |  |  |  |
Eleventh Amendment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit agreement, variable rate description |  | under the terms of the Eleventh Amendment, two new covenants were added. First, commencing June 30, 2025, Borrowers must maintain Liquidity measured on a monthly basis of not less than: $30,000 for the month ending June 30, 2025; $35,000 for the month ending July 31, 2025; $4,042 for the month ending August 31, 2025; $25,000 for the month ending September 30, 2025; $3,000 for the month ending October 31, 2025; $9,292 for the month ending November 30, 2025; and $20,000 for the month ending December 31, 2025, it being understood that Liquidity will include the sum of Borrowers’ cash, plus 50% of cash held in accounts outside of the U.S. plus the amount by which the revolver commitments exceed the revolver balance (net of letters of credit). Second, Borrowers must attain minimum, year-to-date Consolidated EBITDA (reflecting the exclusion of non-recurring non-cash charges and certain other charges as per the Eighth Amendment) as measured quarterly in the following amounts: $4,500 as of June 30, 2025; $9,500 as of September 30, 2025; and $35,000 as of December 31, 2025. With these changes, with respect to Revolver Loans, the Applicable Margins for SOFR are set at 3.75% from the Closing through September 30, 2025, and then rises to 4.75% as of October 1, 2025, and thereafter, while the Adjusted Base Rate increases to 2.75% and 3.75% during those respective periods. |  |  |  |  |  |  |  |  |  |  |  |
Borrowing Additional Cash |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |
NonCashChargesInSecondQuarterTwoThousandTwentyFour[Member] | Amendment Credit Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit agreement, variable rate basis |  | 4.00% |  |  |  |  |  |  |  |  |  |  |  |
Senior Secured Revolving Line Of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  | $ 275,000 |  |  |  |  |  |  |  |  |  |  |  |
Available borrowings capacity under credit agreement |  | $ 25,000 |  |  |  |  |  |  |  |  |  |  |  |
Credit agreement, covenant description |  | The Credit Agreement amended and restated the previous credit facility, which had a maturity date of June 30, 2022. With respect to key financial covenants, the Credit Agreement contains two: namely, borrowers are required to maintain a Total Leverage (“TL”) Ratio of no more than 3.5-to-1, during the first three years, stepping down to 3.25-to-1 as of December 31, 2024, and a Fixed Charge Coverage Ratio ("FCCR") of at least 1.25-to-1. In addition, to the extent that it completes acquisitions totaling $15,000 or more in any 90-day period, AMVAC may step-up the TL Ratio by 0.5-to-1, not to exceed 4.00-to-1, for the next three full consecutive quarters. |  |  |  |  |  |  |  |  |  |  |  |
Consolidated funded debt ratio |  | 3.25% |  |  |  |  |  |  |  |  |  |  |  |
Senior secured credit facility, maturity date |  | Aug. 05, 2026 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 7.68% |  |  |  |  |  |  |  |  |  |  |  |
Interest Expense, Debt |  | $ 16,054 | $ 12,391 | $ 4,238 |  |  |  |  |  |  |  |  |  |
Senior Secured Revolving Line Of Credit | Term Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accordion feature |  | $ 150,000 |  |  |  |  |  |  |  |  |  |  |  |
Senior Secured Revolving Line Of Credit | Credit Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated funded debt ratio |  | 0.50% |  |  |  |  |  |  |  |  |  |  |  |
Capacity to increase borrowings under credit agreement |  | $ 28,623 |  |  |  |  |  |  |  |  |  |  |  |
Security Agreement | Eleven To Third Amended Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit agreement, variable rate description |  | the Company and the lenders entered into Amendment Number Eleven to the Third Amended Loan and Security Agreement, under which events of default arising from the failure of Borrowers to be in compliance with both the Total Leverage Ratio and the Fixed Charge Coverage Ratio as of March 31, 2025, were waived. In addition, the Total Revolver Commitment was reduced from $275,000 to the following: $245,000, effective from the Closing Date through November 29, 2025; $225,000 effective from November 30, 2025, through December 30, 2025; and $200,000 from December 31, 2025, through the expiration of the agreement. In addition, the due date for audited fiscal year-end financial statements was extended to one hundred fifty-seven (157) days (after the end of the fiscal year) for 2025 only, and the due date for first quarter financial statements was extended to sixty-seven (67) days after March 31, 2025. In addition, the Maximum Total Leverage Ratio covenant was suspended for the quarters ending on June 30, 2025, September 30, 2025, and December 31, 2025, and set at 4.00 to 1.00 for the quarter ending March 31, 2026, and thereafter. Further, the Fixed Charge Coverage Ratio covenant was suspended for the quarter ending June 30, 2025, then set at 1.00 to 1.00 for the quarter ending September 30, 2025, then set at 1.25 to 1:00 for the quarter ending December 31, 2025, and thereafter. |  |  |  |  |  |  |  |  |  |  |  |
Maximum | Third Amended Loan Member |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowing capacity used |  | $ 75,000 |  |  |  |  |  |  |  |  |  |  |  |
Consolidated funded debt ratio |  | 4.00% |  |  |  |  |  |  |  |  |  |  |  |
Maximum | Third Amended Loan Member | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowing capacity used |  |  |  |  | $ 40,000 |  |  |  |  |  |  |  | $ 50,000 |
Maximum | Senior Secured Revolving Line Of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available borrowings capacity under credit agreement |  | $ 275,000 |  |  |  |  |  |  |  |  |  |  |  |
Consolidated funded debt ratio |  | 3.50% |  |  |  |  |  |  |  |  |  |  |  |
Maximum | Senior Secured Revolving Line Of Credit | Credit Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated funded debt ratio |  | 4.00% |  |  |  |  |  |  |  |  |  |  |  |
Joint venture, consideration |  | $ 50,000 |  |  |  |  |  |  |  |  |  |  |  |
Maximum | Security Agreement | Third Amended Loan Member |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated funded debt ratio |  | 1.25% |  |  |  |  |  |  |  |  |  |  |  |
Minimum [Member] | Third Amended Loan Member |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated funded debt ratio |  | 1.00% |  |  |  |  |  |  |  |  |  |  |  |
Minimum [Member] | Senior Secured Revolving Line Of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated funded debt ratio |  | 1.25% |  |  |  |  |  |  |  |  |  |  |  |
Minimum [Member] | Senior Secured Revolving Line Of Credit | Credit Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Joint venture, consideration |  | $ 15,000 |  |  |  |  |  |  |  |  |  |  |  |
Minimum [Member] | Senior Secured Revolving Line Of Credit | Amendment Credit Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated funded debt ratio | 90.00% | 1.15% |  |  |  |  |  |  |  |  |  |  |  |

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