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Cash Dividend (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended
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Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016
Supplemental Cash Flow Elements [Abstract] |  |  |  |
Cash dividend declaration date | Sep. 18, 2017 | Jun. 08, 2017 | Mar. 07, 2017 | Dec. 18, 2016
Cash dividend record date | Oct. 05, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 23, 2016
Cash dividend distributed date | Oct. 19, 2017 | Jul. 14, 2017 | Apr. 14, 2017 | Jan. 06, 2017
Cash dividend per share | $ 0.015 | $ 0.015 | $ 0.015 | $ 0.010
Cash dividend paid | $ 439 | $ 437 | $ 435 | $ 289

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- Definition Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests. + References No definition available. + Details
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Namespace Prefix: | avd_
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Balance Type: | debit
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=98513485&loc=d3e4304-108586 + Details
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Namespace Prefix: | us-gaap_
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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=98513485&loc=d3e4304-108586 + Details
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Balance Type: | na
Period Type: | instant

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- 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=98513485&loc=d3e4304-108586 + Details
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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_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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