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Summary of Worldwide Export Sales (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Segment Reporting Information [Line Items] |  |  |
Worldwide Export Sales | $ 73,706 avd_EntityWideDisclosureOnGeographicAreasRevenueFromExternalCustomersAttributableToForeignCountries | $ 69,772 avd_EntityWideDisclosureOnGeographicAreasRevenueFromExternalCustomersAttributableToForeignCountries | $ 69,909 avd_EntityWideDisclosureOnGeographicAreasRevenueFromExternalCustomersAttributableToForeignCountries
Mexico |  |  |
Segment Reporting Information [Line Items] |  |  |
Worldwide Export Sales | 14,601 avd_EntityWideDisclosureOnGeographicAreasRevenueFromExternalCustomersAttributableToForeignCountries / us-gaap_StatementGeographicalAxis = country_MX | 15,661 avd_EntityWideDisclosureOnGeographicAreasRevenueFromExternalCustomersAttributableToForeignCountries / us-gaap_StatementGeographicalAxis = country_MX | 17,980 avd_EntityWideDisclosureOnGeographicAreasRevenueFromExternalCustomersAttributableToForeignCountries / us-gaap_StatementGeographicalAxis = country_MX
Central & South America |  |  |
Segment Reporting Information [Line Items] |  |  |
Worldwide Export Sales | 16,585 avd_EntityWideDisclosureOnGeographicAreasRevenueFromExternalCustomersAttributableToForeignCountries / us-gaap_StatementGeographicalAxis = avd_CentralAndSouthAmericaMember | 15,491 avd_EntityWideDisclosureOnGeographicAreasRevenueFromExternalCustomersAttributableToForeignCountries / us-gaap_StatementGeographicalAxis = avd_CentralAndSouthAmericaMember | 16,374 avd_EntityWideDisclosureOnGeographicAreasRevenueFromExternalCustomersAttributableToForeignCountries / us-gaap_StatementGeographicalAxis = avd_CentralAndSouthAmericaMember
Europe |  |  |
Segment Reporting Information [Line Items] |  |  |
Worldwide Export Sales | 13,249 avd_EntityWideDisclosureOnGeographicAreasRevenueFromExternalCustomersAttributableToForeignCountries / us-gaap_StatementGeographicalAxis = us-gaap_EuropeMember | 12,942 avd_EntityWideDisclosureOnGeographicAreasRevenueFromExternalCustomersAttributableToForeignCountries / us-gaap_StatementGeographicalAxis = us-gaap_EuropeMember | 9,744 avd_EntityWideDisclosureOnGeographicAreasRevenueFromExternalCustomersAttributableToForeignCountries / us-gaap_StatementGeographicalAxis = us-gaap_EuropeMember
Asia |  |  |
Segment Reporting Information [Line Items] |  |  |
Worldwide Export Sales | 7,683 avd_EntityWideDisclosureOnGeographicAreasRevenueFromExternalCustomersAttributableToForeignCountries / us-gaap_StatementGeographicalAxis = us-gaap_AsiaMember | 8,129 avd_EntityWideDisclosureOnGeographicAreasRevenueFromExternalCustomersAttributableToForeignCountries / us-gaap_StatementGeographicalAxis = us-gaap_AsiaMember | 7,308 avd_EntityWideDisclosureOnGeographicAreasRevenueFromExternalCustomersAttributableToForeignCountries / us-gaap_StatementGeographicalAxis = us-gaap_AsiaMember
Africa |  |  |
Segment Reporting Information [Line Items] |  |  |
Worldwide Export Sales | 9,310 avd_EntityWideDisclosureOnGeographicAreasRevenueFromExternalCustomersAttributableToForeignCountries / us-gaap_StatementGeographicalAxis = us-gaap_AfricaMember | 8,322 avd_EntityWideDisclosureOnGeographicAreasRevenueFromExternalCustomersAttributableToForeignCountries / us-gaap_StatementGeographicalAxis = us-gaap_AfricaMember | 7,229 avd_EntityWideDisclosureOnGeographicAreasRevenueFromExternalCustomersAttributableToForeignCountries / us-gaap_StatementGeographicalAxis = us-gaap_AfricaMember
Australia |  |  |
Segment Reporting Information [Line Items] |  |  |
Worldwide Export Sales | 4,202 avd_EntityWideDisclosureOnGeographicAreasRevenueFromExternalCustomersAttributableToForeignCountries / us-gaap_StatementGeographicalAxis = country_AU | 2,692 avd_EntityWideDisclosureOnGeographicAreasRevenueFromExternalCustomersAttributableToForeignCountries / us-gaap_StatementGeographicalAxis = country_AU | 4,444 avd_EntityWideDisclosureOnGeographicAreasRevenueFromExternalCustomersAttributableToForeignCountries / us-gaap_StatementGeographicalAxis = country_AU
Canada |  |  |
Segment Reporting Information [Line Items] |  |  |
Worldwide Export Sales | 4,910 avd_EntityWideDisclosureOnGeographicAreasRevenueFromExternalCustomersAttributableToForeignCountries / us-gaap_StatementGeographicalAxis = country_CA | 3,976 avd_EntityWideDisclosureOnGeographicAreasRevenueFromExternalCustomersAttributableToForeignCountries / us-gaap_StatementGeographicalAxis = country_CA | 4,320 avd_EntityWideDisclosureOnGeographicAreasRevenueFromExternalCustomersAttributableToForeignCountries / us-gaap_StatementGeographicalAxis = country_CA
Middle East |  |  |
Segment Reporting Information [Line Items] |  |  |
Worldwide Export Sales | 3,166 avd_EntityWideDisclosureOnGeographicAreasRevenueFromExternalCustomersAttributableToForeignCountries / us-gaap_StatementGeographicalAxis = us-gaap_MiddleEastMember | 2,500 avd_EntityWideDisclosureOnGeographicAreasRevenueFromExternalCustomersAttributableToForeignCountries / us-gaap_StatementGeographicalAxis = us-gaap_MiddleEastMember | 2,495 avd_EntityWideDisclosureOnGeographicAreasRevenueFromExternalCustomersAttributableToForeignCountries / us-gaap_StatementGeographicalAxis = us-gaap_MiddleEastMember
Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Worldwide Export Sales |  | $ 59 avd_EntityWideDisclosureOnGeographicAreasRevenueFromExternalCustomersAttributableToForeignCountries / us-gaap_StatementGeographicalAxis = avd_OtherCountriesMember | $ 15 avd_EntityWideDisclosureOnGeographicAreasRevenueFromExternalCustomersAttributableToForeignCountries / us-gaap_StatementGeographicalAxis = avd_OtherCountriesMember

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