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Litigation and Environmental - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 0 Months Ended | 12 Months Ended | 0 Months Ended | 1 Months Ended
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Nov. 20, 2014 | Sep. 19, 2013 Claimant | Dec. 31, 2014 | Mar. 31, 2012 Case | Oct. 31, 1997 Plaintiff Country
Loss Contingencies [Line Items] |  |  |  |  |
Number of Claimants Involved in Case |  | 14 avd_NumberOfClaimantsInvolvedInCase |  |  |
Number of Claimants Not Involved in Case |  | 8 avd_NumberOfClaimantsNotInvolvedInCase |  |  |
Potential value of fine against AMVAC |  |  | $ 200 avd_FinesAssessed |  |
Legal settlements | 168 us-gaap_PaymentsForLegalSettlements |  |  |  |
Delaware |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Number of cases filed |  |  |  | 2 us-gaap_LossContingencyNewClaimsFiledNumber / us-gaap_LitigationCaseAxis = avd_DelawareMember |
Hendler Law Firm |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Number of dismissed complaints |  |  | 22 us-gaap_LossContingencyClaimsSettledAndDismissedNumber / avd_PlaintiffsNameAxis = avd_HendlerLawFirmMember |  |
Former Banana Workers |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Number of claimants |  |  |  |  | 10 us-gaap_LossContingencyNumberOfDefendants / avd_LossContingenciesByNameOfPlaintiffAxis = avd_FormerBananaWorkersMember
Number Of Countries |  |  |  |  | 4 avd_NumberOfCountries / avd_LossContingenciesByNameOfPlaintiffAxis = avd_FormerBananaWorkersMember
Former Banana Workers | Louisiana And Delaware |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Number of pending claims |  |  | 2 us-gaap_LossContingencyPendingClaimsNumber / us-gaap_LitigationCaseAxis = avd_LouisianaAndDelawareMember / avd_LossContingenciesByNameOfPlaintiffAxis = avd_FormerBananaWorkersMember |  |
Former Banana Workers | Delaware |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Number of dismissed complaints |  |  | 2 us-gaap_LossContingencyClaimsSettledAndDismissedNumber / us-gaap_LitigationCaseAxis = avd_DelawareMember / avd_LossContingenciesByNameOfPlaintiffAxis = avd_FormerBananaWorkersMember |  |
Number of claimants |  |  | 2,700 us-gaap_LossContingencyNumberOfPlaintiffs / us-gaap_LitigationCaseAxis = avd_DelawareMember / avd_LossContingenciesByNameOfPlaintiffAxis = avd_FormerBananaWorkersMember |  |
Former Banana Workers | Domestic Lawsuits |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Number of lawsuits |  |  | 4 avd_NumberOfLawsuits / us-gaap_LitigationCaseAxis = avd_DomesticLawsuitsMember / avd_LossContingenciesByNameOfPlaintiffAxis = avd_FormerBananaWorkersMember |  |
Former Banana Workers | Nicaraguan Lawsuits |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Number of lawsuits |  |  | 85 avd_NumberOfLawsuits / us-gaap_LitigationCaseAxis = avd_NicaraguanLawsuitsMember / avd_LossContingenciesByNameOfPlaintiffAxis = avd_FormerBananaWorkersMember |  |
Former Banana Workers | Nicaraguan |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Number of claimants |  |  | 3,592 us-gaap_LossContingencyNumberOfDefendants / avd_LossContingenciesByNameOfPlaintiffAxis = avd_FormerBananaWorkersMember / us-gaap_StatementScenarioAxis = avd_CountryOneMember |  |
Former Banana Workers | Nicaraguan | Public Law |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Number of Lawsuits Filed |  |  | 85 avd_NumberOfLawsuitsFiled / avd_LossContingenciesByNameOfPlaintiffAxis = avd_FormerBananaWorkersMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = avd_PublicMember / us-gaap_StatementScenarioAxis = avd_CountryOneMember |  |
Former Banana Workers | Nicaraguan | Special Law |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Number of Lawsuits Filed |  |  | 2 avd_NumberOfLawsuitsFiled / avd_LossContingenciesByNameOfPlaintiffAxis = avd_FormerBananaWorkersMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = avd_SpecialMember / us-gaap_StatementScenarioAxis = avd_CountryOneMember |  |
Former Banana Workers | Nicaraguan | Compensatory Damages |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Value of claims paid |  |  | 1,000 avd_ClaimsPaid / avd_LossContingenciesByNameOfPlaintiffAxis = avd_FormerBananaWorkersMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = avd_CompensatoryDamagesMember / us-gaap_StatementScenarioAxis = avd_CountryOneMember |  |
Former Banana Workers | Nicaraguan | Punitive Damages |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Value of claims paid |  |  | $ 5,000 avd_ClaimsPaid / avd_LossContingenciesByNameOfPlaintiffAxis = avd_FormerBananaWorkersMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = avd_PunitiveDamagesMember / us-gaap_StatementScenarioAxis = avd_CountryOneMember |  |

X
- Definition Claims Paid + References No definition available. + Details
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Balance Type: | debit
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- Definition Fines Assessed + References No definition available. + Details
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- Definition Number of claimants involved in case. + References No definition available. + Details
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- Definition Number of claimants not involved in case. + References No definition available. + Details
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- Definition Number of Countries + References No definition available. + Details
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- Definition The number of claims settled and dismissed during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349 + Details
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- Definition The total number of new claims filed pertaining to a loss contingency during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349 + Details
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- Definition Number of defendants named in a legal action. + References No definition available. + Details
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- Definition Number of plaintiffs that have filed claims pertaining to a loss contingency. + References No definition available. + Details
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- Definition Number of pending claims pertaining to a loss contingency. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349 + Details
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- Definition The amount of cash paid for the settlement of litigation or for other legal issues during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585 + Details
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