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v3.19.1

Commitments - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Schedule Of Commitments And Contingencies [Line Items] |  |  |
Rent Expense | $ 1,706 | $ 1,102 | $ 946
Vehicle Lease |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |
Rent Expense | $ 779 | $ 529 | $ 555
Hannibal, Missouri | Long-term Ground Lease |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |
Long Term Ground Leases Expiration Period | 20 years |  |
Minimum | Axis, Alabama | Long-term Ground Lease |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |
Long Term Ground Leases Expiration Period | 20 years |  |
Maximum | Axis, Alabama | Long-term Ground Lease |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |
Long Term Ground Leases Expiration Period | 35 years |  |

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- Definition Lease Expiration Period + References No definition available. + Details
Name: | avd_LeaseExpirationPeriod
Namespace Prefix: | avd_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Schedule Of Commitments And Contingencies [Line Items] + References No definition available. + Details
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- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
Name: | us-gaap_LeaseAndRentalExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |