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Temporary Differences in Financial Statement Carrying Amounts and Tax Bases of Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Deferred Tax Assets And Liabilities [Line Items]
Inventories	$ 5,558us-gaap_DeferredTaxAssetsInventory	$ 4,398us-gaap_DeferredTaxAssetsInventory
State income taxes	(633)us-gaap_DeferredTaxAssetsStateTaxes	(331)us-gaap_DeferredTaxAssetsStateTaxes
Vacation pay accrual	776us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation	648us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation
Accrued bonuses	95us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBonuses	1,791us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBonuses
Bad debt	45us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts	169us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts
Prepaid expenses	(1,314)avd_DeferredTaxAssetsPrepaidExpenses	(1,929)avd_DeferredTaxAssetsPrepaidExpenses
Stock compensation	2,446us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	1,281us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Other	1,758us-gaap_DeferredTaxAssetsOther	494us-gaap_DeferredTaxAssetsOther
Net deferred tax asset	8,731us-gaap_DeferredTaxAssetsNet	6,521us-gaap_DeferredTaxAssetsNet
Plant and equipment, principally due to differences in depreciation and capitalized interest	(28,365)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment	(25,662)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
NOL Carryforward	361avd_DeferredTaxLiabilitiesNetOperatingLossCarryForwards
Tax credit	319avd_DeferredTaxLiabilitiesForeignTaxCredits	14avd_DeferredTaxLiabilitiesForeignTaxCredits
Fair value adjustment		207avd_DeferredTaxLiabilitiesOtherLiabilities
Other	(474)us-gaap_DeferredTaxLiabilitiesOther	2,111us-gaap_DeferredTaxLiabilitiesOther
Net deferred tax liability	(28,159)us-gaap_DeferredTaxLiabilities	(23,330)us-gaap_DeferredTaxLiabilities
Total net deferred tax liability	$ (19,428)us-gaap_DeferredTaxAssetsLiabilitiesNet	$ (16,809)us-gaap_DeferredTaxAssetsLiabilitiesNet

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