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Fair Value of Financial Instruments - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Fair Value Disclosures [Abstract] |  |  |  |  |
Reduction in deferred consideration balances | $ 1,345 | $ 1,468 | $ 2,888 | $ 1,468 |
Deferred consideration | $ 978 |  | $ 978 |  | $ 8,267

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
- Definition Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements. Represents currently earned compensation under compensation arrangements that is not actually paid until a later date. + References No definition available. + Details
Name: | us-gaap_DeferredCompensationLiabilityCurrentAndNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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