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Unamortized Stock Based Compensation Expenses (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Stock Options |  |
Unrecognized Share Based Compensation Expense [Line Items] |  |
Unamortized Stock-Based Compensation Expenses | $ 1,457 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | $ 21 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Remaining Weighted Average Period (yrs) | 3 years | 6 months
Performance Based Options |  |
Unrecognized Share Based Compensation Expense [Line Items] |  |
Unamortized Stock-Based Compensation Expenses | 551 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = avd_PerformanceBasedOptionsMember |
Remaining Weighted Average Period (yrs) | 3 years |
Restricted Stock |  |
Unrecognized Share Based Compensation Expense [Line Items] |  |
Unamortized Stock-Based Compensation Expenses | 4,829 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 5,550 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
Remaining Weighted Average Period (yrs) | 1 year 9 months 18 days | 1 year 10 months 24 days
Performance Shares |  |
Unrecognized Share Based Compensation Expense [Line Items] |  |
Remaining Weighted Average Period (yrs) | 2 years 1 month 6 days | 2 years 4 months 24 days
Performance Based Restricted Stock |  |
Unrecognized Share Based Compensation Expense [Line Items] |  |
Unamortized Stock-Based Compensation Expenses | $ 1,249 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = avd_PerformanceBasedRestrictedStockMember | $ 564 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = avd_PerformanceBasedRestrictedStockMember

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- Definition Unrecognized cost of unvested share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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