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Summary of Long Term Debt (Parenthetical) (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Debt Instrument [Line Items]  
Senior secured credit facility term 5 years
Senior secured credit facility, maturity date June 17, 2018
Revolving Credit Facility  
Debt Instrument [Line Items]  
Senior secured credit facility 200us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= us-gaap_RevolvingCreditFacilityMember
Maximum | Term Loan  
Debt Instrument [Line Items]  
Accordion feature 100us-gaap_SecuredLongTermDebt
/ us-gaap_DebtInstrumentAxis
= avd_TermLoanMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember