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v3.19.1

Fair Value of Financial Instruments - Additional Information (Detail) $ in Thousands | 3 Months Ended
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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