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Schedule of Quarterly Data (Parenthetical) (Detail) $ in Thousands | 3 Months Ended
--- | ---
Dec. 31, 2017 USD ($)
Income Statement [Abstract] |
Income tax benefit related tax cuts and jobs act | $ 3,433

X
- Definition Amount of income tax expense (benefit) from effect of Tax Cuts and Jobs Act. + References No definition available. + Details
Name: | avd_TaxCutsAndJobsActIncomeTaxExpenseBenefit
Namespace Prefix: | avd_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_IncomeStatementAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration