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Subsequent event - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified			0 Months Ended
	Sep. 30, 2014	Mar. 25, 2013	Oct. 01, 2014 Subsequent Event	Oct. 01, 2014 Subsequent Event
Subsequent Event [Line Items]
Warrants exercised amount			$ 500
Warrants exercised shares			6,155,000
Equity investment ownership position	19.28%	29.27%		21.18%

X

- Definition

Warrant Exercises

+ References

No definition available.

+ Details

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

X

- Definition

Warrants Exercised Shares

+ References

No definition available.

+ Details

Name:	avd_WarrantsExercisedShares
Namespace Prefix:	avd_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571

+ Details

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

X

- Details

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