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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 | $ 107,007 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill | $ 113,521 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill | $ 116,189 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
Write off during fiscal 2014 | (319)us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill |  |
Acquisitions during fiscal year |  |  | 3,473 us-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 | $ 100,211 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill | $ 107,007 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill | $ 113,521 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill

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- Definition Indefinite Lived Intangible Assets Accumulated Amortization During Period + References No definition available. + Details
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- Details
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- Definition 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) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16373-109275 + Details
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- Definition Amount of increase in assets, excluding financial assets and goodwill, lacking physical substance with an indefinite life, resulting from a business combination. + References No definition available. + Details
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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 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition 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. + References No definition available. + Details
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