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Schedule of Intangible Assets Recognized in Connection with Product Acquisitions (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Business Acquisition [Line Items]
Beginning Balance	$ 107,007us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill	$ 113,521us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill	$ 116,189us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
Write off during fiscal 2014	(319)us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill
Acquisitions during fiscal year			3,473us-gaap_IndefinitelivedIntangibleAssetsAcquired
Impact of movement in exchange rates	(86)us-gaap_IndefiniteLivedIntangibleAssetsTranslationAndPurchaseAccountingAdjustments	(162)us-gaap_IndefiniteLivedIntangibleAssetsTranslationAndPurchaseAccountingAdjustments	(118)us-gaap_IndefiniteLivedIntangibleAssetsTranslationAndPurchaseAccountingAdjustments
Amortization expense	(6,391)avd_IndefiniteLivedIntangibleAssetsAccumulatedAmortizationDuringPeriod	(6,352)avd_IndefiniteLivedIntangibleAssetsAccumulatedAmortizationDuringPeriod	(6,023)avd_IndefiniteLivedIntangibleAssetsAccumulatedAmortizationDuringPeriod
Ending Balance	$ 100,211us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill	$ 107,007us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill	$ 113,521us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill

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Amount of impairment loss resulting from write-down of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit to fair value.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 3

-Subparagraph (b)

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Amount of increase in assets, excluding financial assets and goodwill, lacking physical substance with an indefinite life, resulting from a business combination.

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- Definition

Amount of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

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Amount of increase (decrease) of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit, from foreign currency translation and purchase accounting adjustments.

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