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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