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Product Acquisitions - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Business Acquisition [Line Items]
Fair value reduction	$ 32us-gaap_LiabilitiesFairValueAdjustment	$ 297us-gaap_LiabilitiesFairValueAdjustment	$ 216us-gaap_LiabilitiesFairValueAdjustment
Product acquisition and licensing agreements obligation, Other Liability	2,492avd_BusinessAcquisitionPurchasePriceAllocationOtherLiabilitiesAssumed
Costs and Expenses
Business Acquisition [Line Items]
Fair value reduction	32us-gaap_LiabilitiesFairValueAdjustment / us-gaap_IncomeStatementLocationAxis = us-gaap_OperatingExpenseMember	297us-gaap_LiabilitiesFairValueAdjustment / us-gaap_IncomeStatementLocationAxis = us-gaap_OperatingExpenseMember	216us-gaap_LiabilitiesFairValueAdjustment / us-gaap_IncomeStatementLocationAxis = us-gaap_OperatingExpenseMember
Cost of Sales
Business Acquisition [Line Items]
Fair value reduction			$ 0us-gaap_LiabilitiesFairValueAdjustment / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember
Product Rights
Business Acquisition [Line Items]
Expected useful life	25 years
Customer Lists
Business Acquisition [Line Items]
Expected useful life	10 years
Trademarks
Business Acquisition [Line Items]
Expected useful life	25 years

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- Definition

Business Acquisition Purchase Price Allocation Other Liabilities Assumed

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- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Amount of addition (reduction) to the amount at which a liability could be incurred (settled) in a current transaction between willing parties.

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