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Commitments - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Schedule Of Commitments And Contingencies [Line Items] |  |  |
Rent Expense | $ 1,012 us-gaap_LeaseAndRentalExpense | $ 939 us-gaap_LeaseAndRentalExpense | $ 727 us-gaap_LeaseAndRentalExpense
Hannibal, Missouri |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |
Long Term Ground Leases Expiration Period |  | 20 years | 20 years
Marsing |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |
Long Term Ground Leases Expiration Period |  | 25 years | 25 years
Minimum | Axis, Alabama |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |
Long Term Ground Leases Expiration Period | 20 years |  |
Maximum | Axis, Alabama |  |  |
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
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Namespace Prefix: | avd_
Data Type: | xbrli:durationItemType
Balance Type: | na
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- 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: |
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- Details
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Period Type: |

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- Details
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- Details
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