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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

X

- Details

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Namespace Prefix:	avd_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Lease Expiration Period

+ References

No definition available.

+ Details

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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

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration