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Fair Value of Financial Instruments - Additional Information (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Fair Value Disclosures [Abstract]
Reduction in deferred consideration balances	$ 1,543

X

- Definition

The increase (decrease) during the reporting period in the obligation created by deferred compensation under acquisitions that will be paid in the future.

+ References

No definition available.

+ Details

Name:	avd_IncreaseDecreaseInDeferredCompensationAsResultOfAcquisitions
Namespace Prefix:	avd_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_FairValueDisclosuresAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration