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Cash Dividends - Additional Information (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 1 Months Ended | 6 Months Ended |  |  |  | 1 Months Ended
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Jun. 30, 2013 | Apr. 19, 2013 | Apr. 16, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Jun. 10, 2013 | Mar. 11, 2013 | Mar. 08, 2012 | Jul. 19, 2013 Subsequent Event
Dividends [Line Items] |  |  |  |  |  |  |  |  |
Cash dividend declared |  |  |  |  |  | $ 0.05 | $ 0.07 | $ 0.05 |
Dividend distributed date | Jul. 19, 2013 |  |  | Apr. 19, 2013 | Apr. 16, 2012 |  |  |  |
Cash dividend record date | Jul. 05, 2013 |  |  | Apr. 05, 2013 | Apr. 01, 2012 |  |  |  |
Cash dividends paid |  | $ 1,976 | $ 1,380 |  |  |  |  |  | $ 1,413

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- 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

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

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- 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

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- 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

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- 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_
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Period Type: | duration