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Summary of Stock Options Summarized by Exercise Price (Detail) (USD $) | 3 Months Ended |
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Mar. 31, 2015 | Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Outstanding Weighted Average, Exercise Price | $ 9.21 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice | $ 9.22 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Exercisable Weighted Average, Exercise Price | $ 7.71 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice | $ 7.82 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
Incentive Stock Option Plan |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Outstanding Weighted Average, Shares | 697,854 avd_ShareBasedCompensationByShareBasedPaymentAwardOptionOutstandingWeightedAverageNumberOfShares / us-gaap_PlanNameAxis = avd_IncentiveStockOptionPlanMember |
Outstanding Weighted Average, Remaining Life (Months) | 87 months |
Outstanding Weighted Average, Exercise Price | $ 9.21 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_PlanNameAxis = avd_IncentiveStockOptionPlanMember |
Exercisable Weighted Average, Shares | 421,229 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber / us-gaap_PlanNameAxis = avd_IncentiveStockOptionPlanMember |
Exercisable Weighted Average, Exercise Price | $ 7.71 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice / us-gaap_PlanNameAxis = avd_IncentiveStockOptionPlanMember |
Incentive Stock Option Plan | Range One |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Exercise Price Per Share, Lower Range | $ 7.50 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit / us-gaap_PlanNameAxis = avd_IncentiveStockOptionPlanMember / us-gaap_RangeAxis = avd_RangeOneMember |
Outstanding Weighted Average, Shares | 404,550 avd_ShareBasedCompensationByShareBasedPaymentAwardOptionOutstandingWeightedAverageNumberOfShares / us-gaap_PlanNameAxis = avd_IncentiveStockOptionPlanMember / us-gaap_RangeAxis = avd_RangeOneMember |
Outstanding Weighted Average, Remaining Life (Months) | 68 months |
Outstanding Weighted Average, Exercise Price | $ 7.50 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_PlanNameAxis = avd_IncentiveStockOptionPlanMember / us-gaap_RangeAxis = avd_RangeOneMember |
Exercisable Weighted Average, Shares | 404,550 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber / us-gaap_PlanNameAxis = avd_IncentiveStockOptionPlanMember / us-gaap_RangeAxis = avd_RangeOneMember |
Exercisable Weighted Average, Exercise Price | $ 7.50 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice / us-gaap_PlanNameAxis = avd_IncentiveStockOptionPlanMember / us-gaap_RangeAxis = avd_RangeOneMember |
Incentive Stock Option Plan | Range Two |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Exercise Price Per Share, Lower Range | $ 11.32 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit / us-gaap_PlanNameAxis = avd_IncentiveStockOptionPlanMember / us-gaap_RangeAxis = avd_RangeTwoMember |
Exercise Price Per Share, Upper Range | $ 14.75 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit / us-gaap_PlanNameAxis = avd_IncentiveStockOptionPlanMember / us-gaap_RangeAxis = avd_RangeTwoMember |
Outstanding Weighted Average, Shares | 293,304 avd_ShareBasedCompensationByShareBasedPaymentAwardOptionOutstandingWeightedAverageNumberOfShares / us-gaap_PlanNameAxis = avd_IncentiveStockOptionPlanMember / us-gaap_RangeAxis = avd_RangeTwoMember |
Outstanding Weighted Average, Remaining Life (Months) | 114 months |
Outstanding Weighted Average, Exercise Price | $ 11.56 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_PlanNameAxis = avd_IncentiveStockOptionPlanMember / us-gaap_RangeAxis = avd_RangeTwoMember |
Exercisable Weighted Average, Shares | 16,679 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber / us-gaap_PlanNameAxis = avd_IncentiveStockOptionPlanMember / us-gaap_RangeAxis = avd_RangeTwoMember |
Exercisable Weighted Average, Exercise Price | $ 12.69 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice / us-gaap_PlanNameAxis = avd_IncentiveStockOptionPlanMember / us-gaap_RangeAxis = avd_RangeTwoMember |
Performance Incentive Stock Option Plan |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Outstanding Weighted Average, Shares | 107,689 avd_ShareBasedCompensationByShareBasedPaymentAwardOptionOutstandingWeightedAverageNumberOfShares / us-gaap_PlanNameAxis = avd_PerformanceIncentiveStockOptionPlanMember |
Outstanding Weighted Average, Remaining Life (Months) | 33 months |
Outstanding Weighted Average, Exercise Price | $ 11.49 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_PlanNameAxis = avd_PerformanceIncentiveStockOptionPlanMember | $ 11.49 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_PlanNameAxis = avd_PerformanceIncentiveStockOptionPlanMember
Performance Incentive Stock Option Plan | Range Three |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Exercise Price Per Share, Lower Range | $ 11.49 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit / us-gaap_PlanNameAxis = avd_PerformanceIncentiveStockOptionPlanMember / us-gaap_RangeAxis = avd_RangeThreeMember |
Outstanding Weighted Average, Shares | 107,689 avd_ShareBasedCompensationByShareBasedPaymentAwardOptionOutstandingWeightedAverageNumberOfShares / us-gaap_PlanNameAxis = avd_PerformanceIncentiveStockOptionPlanMember / us-gaap_RangeAxis = avd_RangeThreeMember |
Outstanding Weighted Average, Remaining Life (Months) | 33 months |
Outstanding Weighted Average, Exercise Price | $ 11.49 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_PlanNameAxis = avd_PerformanceIncentiveStockOptionPlanMember / us-gaap_RangeAxis = avd_RangeThreeMember |

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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + 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 (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + 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 (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + 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 (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for option awards outstanding, 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + 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 (g) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + 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 (g) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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