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Commitments - Additional information (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Commitments and Contingencies [Line Items] |  |  |
Rent Expense | $ 696 | $ 550 | $ 392
Hannibal |  |  |
Commitments and Contingencies [Line Items] |  |  |
Long Term Ground Leases Expiration Period | 20 years |  |
Missouri |  |  |
Commitments and Contingencies [Line Items] |  |  |
Long Term Ground Leases Expiration Period | 20 years |  |
Marsing |  |  |
Commitments and Contingencies [Line Items] |  |  |
Long Term Ground Leases Expiration Period | 25 years |  |
Minimum | Axis |  |  |
Commitments and Contingencies [Line Items] |  |  |
Long Term Ground Leases Expiration Period | 20 years |  |
Minimum | Alabama |  |  |
Commitments and Contingencies [Line Items] |  |  |
Long Term Ground Leases Expiration Period | 20 years |  |
Maximum | Axis |  |  |
Commitments and Contingencies [Line Items] |  |  |
Long Term Ground Leases Expiration Period | 35 years |  |
Maximum | Alabama |  |  |
Commitments and Contingencies [Line Items] |  |  |
Long Term Ground Leases Expiration Period | 35 years |  |

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- Details
Name: | avd_CommitmentsAndContingenciesLineItems
Namespace Prefix: | avd_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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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 Rental expense incurred for leased assets including furniture and equipment which has not been recognized in costs and expenses applicable to sales and revenues; for example, cost of goods sold or other operating costs and expenses. + References No definition available. + Details
Name: | us-gaap_LeaseAndRentalExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration