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Cash Dividends (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Dividends [Line Items]
Cash dividend declared	$ 0.10	$ 0.12
Cash dividends paid	$ 2,837	$ 3,389
Second Quarter Dividend
Dividends [Line Items]
Cash dividend declaration Date	Jun. 09, 2014	Jun. 10, 2013
Cash dividend distributed date	Jul. 17, 2014	Jul. 19, 2013
Cash dividend record date	Jul. 03, 2014	Jul. 05, 2013
Cash dividend declared	$ 0.05	$ 0.05
Cash dividends paid	1,420	1,413
First Quarter Dividend
Dividends [Line Items]
Cash dividend declaration Date	Mar. 10, 2014	Mar. 11, 2013
Cash dividend distributed date	Apr. 18, 2014	Apr. 19, 2013
Cash dividend record date	Apr. 04, 2013	Apr. 05, 2013
Cash dividend declared	$ 0.05	$ 0.07
Cash dividends paid	$ 1,417	$ 1,976

X

- Definition

Cash dividend paid.

+ References

No definition available.

+ Details

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Namespace Prefix:	avd_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

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

X

- Definition

Date the declared dividend will be paid, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The per share amount of a dividend declared, but not paid, as of the financial reporting date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Date the dividend to be paid was declared, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586

+ Details

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X

- Definition

Date the holder must own the stock to be entitled to the dividend, in CCYY-MM-DD format.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
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