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Debt - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Debt Instrument [Line Items] |  |  |  |  |
Short term debt | $ 0 |  | $ 0 |  | $ 0
Credit agreement, Interest | 4,378 | $ 3,384 | $ 11,988 | $ 8,282 |
LIBOR Member |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Credit agreement, variable rate basis |  |  | 1.00% |  |
Amendment Credit Agreement [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Credit agreement, variable rate description |  |  | the Company and the lenders entered into Amendment Number Seven to the Credit Agreement, effective June 30, 2024, under which the Maximum Total Leverage Ratio was modified to 4.25 for the period ended June 30, 2024; 5.0 for the period ending September 30, 2024; 4.5 for the periods ending December 31, 2024, March 31, 2025 and 4.25 for June 30, 2025; 4.0 for the period ending September 30, 2025, and returning to 3.25 for the period ending December 31, 2025 and thereafter. The Minimum Fixed Charge Coverage Ratio remains the same, and a new covenant, the Minimum Modified Current Ratio of not less than 1.5 (defined as the ratio of (i) Accounts Receivable plus Inventory, to (ii) Funded Debt of the Company and its Subsidiaries on a consolidated basis). In addition, the Company may not repurchase shares, pay cash dividends to shareholders or make Permitted Acquisitions without Lenders’ consent. In addition, for purposes of calculating Consolidated EBITDA, the basket for transformation and one-time (cash and non-cash charges (which are excluded from such measure) has been increased from $5,000 to $12,500 in second quarter 2024, $45,000 (in third quarter 2024, fourth quarter 2024 and first quarter 2025), $42,500 in second quarter 2025, $15,000 in third quarter 2025 and $7,500 in fourth quarter 2025, as measured on a four-quarter trailing basis. Finally, the interest rates for the Credit Agreement, as amended, were increased by 25bps to the extent the Total Leverage Ratio equals or exceeds 4.0 and remains at the rates set forth in the Amendment Number Six to the extent the Total Leverage Ratio is below 4.0 |  |
Amendment Credit Agreement [Member] | Q2 2024 [Member] |  |  |  |  |
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 |  | $ 275,000 |  |
Credit agreement, covenant description |  |  | the Credit Agreement originally contained two: namely, borrowers are required to maintain a Total Leverage Ratio of no more than 3.5-to-1, during the first three years, stepping down to 3.25-to-1 as of September 30, 2024, and a Fixed Charge Coverage Ratio 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 Total Leverage 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 |  |
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 Margin” which is based upon the Total Leverage 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 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 nine- month periods, as selected by the Company) |  |
Debt Instrument, Interest Rate, Stated Percentage | 8.48% |  | 8.48% |  |
Interest Expense, Debt | $ 4,435 | $ 3,384 | $ 12,296 | $ 8,282 |
Senior Secured Revolving Line of Credit | Federal Funds Rate |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Credit agreement, variable rate basis |  |  | 0.50% |  |
Senior Secured Revolving Line of Credit | LIBOR Member |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Credit agreement, variable rate basis |  |  | 1.10% |  |
Senior Secured Revolving Line of Credit | Adjusted Base Rate |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Credit agreement, interest payment period, description |  |  | last business day of each month and the maturity date. |  |
Senior Secured Revolving Line of Credit | Term Loan [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Accordion feature | 150,000 |  | $ 150,000 |  |
Senior Secured Revolving Line of Credit | Credit Agreement [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Consolidated funded debt ratio |  |  | 0.50% |  |
Maximum | Senior Secured Revolving Line of Credit |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Available borrowings capacity under credit agreement | 25,000 |  | $ 25,000 |  |
Consolidated funded debt ratio |  |  | 3.50% |  |
Maximum | Senior Secured Revolving Line of Credit | Credit Agreement [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Consolidated funded debt ratio |  |  | 4.00% |  |
Joint venture, consideration |  |  | $ 50,000 |  |
Capacity to increase borrowings under credit agreement | $ 44,716 |  | $ 44,716 |  | $ 115,002
Minimum | Senior Secured Revolving Line of Credit |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Consolidated fixed charge covenant ratio |  |  | 1.25% |  |
Minimum | Senior Secured Revolving Line of Credit | Credit Agreement [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Joint venture, consideration |  |  | $ 15,000 |  |

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