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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
	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		14avd_NumberOfClaimantsInvolvedInCase
Number of Claimants Not Involved in Case		8avd_NumberOfClaimantsNotInvolvedInCase
Potential value of fine against AMVAC			$ 200avd_FinesAssessed
Legal settlements	168us-gaap_PaymentsForLegalSettlements
Delaware
Loss Contingencies [Line Items]
Number of cases filed				2us-gaap_LossContingencyNewClaimsFiledNumber / us-gaap_LitigationCaseAxis = avd_DelawareMember
Hendler Law Firm
Loss Contingencies [Line Items]
Number of dismissed complaints			22us-gaap_LossContingencyClaimsSettledAndDismissedNumber / avd_PlaintiffsNameAxis = avd_HendlerLawFirmMember
Former Banana Workers
Loss Contingencies [Line Items]
Number of claimants					10us-gaap_LossContingencyNumberOfDefendants / avd_LossContingenciesByNameOfPlaintiffAxis = avd_FormerBananaWorkersMember
Number Of Countries					4avd_NumberOfCountries / avd_LossContingenciesByNameOfPlaintiffAxis = avd_FormerBananaWorkersMember
Former Banana Workers | Louisiana And Delaware
Loss Contingencies [Line Items]
Number of pending claims			2us-gaap_LossContingencyPendingClaimsNumber / us-gaap_LitigationCaseAxis = avd_LouisianaAndDelawareMember / avd_LossContingenciesByNameOfPlaintiffAxis = avd_FormerBananaWorkersMember
Former Banana Workers | Delaware
Loss Contingencies [Line Items]
Number of dismissed complaints			2us-gaap_LossContingencyClaimsSettledAndDismissedNumber / us-gaap_LitigationCaseAxis = avd_DelawareMember / avd_LossContingenciesByNameOfPlaintiffAxis = avd_FormerBananaWorkersMember
Number of claimants			2,700us-gaap_LossContingencyNumberOfPlaintiffs / us-gaap_LitigationCaseAxis = avd_DelawareMember / avd_LossContingenciesByNameOfPlaintiffAxis = avd_FormerBananaWorkersMember
Former Banana Workers | Domestic Lawsuits
Loss Contingencies [Line Items]
Number of lawsuits			4avd_NumberOfLawsuits / us-gaap_LitigationCaseAxis = avd_DomesticLawsuitsMember / avd_LossContingenciesByNameOfPlaintiffAxis = avd_FormerBananaWorkersMember
Former Banana Workers | Nicaraguan Lawsuits
Loss Contingencies [Line Items]
Number of lawsuits			85avd_NumberOfLawsuits / us-gaap_LitigationCaseAxis = avd_NicaraguanLawsuitsMember / avd_LossContingenciesByNameOfPlaintiffAxis = avd_FormerBananaWorkersMember
Former Banana Workers | Nicaraguan
Loss Contingencies [Line Items]
Number of claimants			3,592us-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			85avd_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			2avd_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			1,000avd_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			$ 5,000avd_ClaimsPaid / avd_LossContingenciesByNameOfPlaintiffAxis = avd_FormerBananaWorkersMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = avd_PunitiveDamagesMember / us-gaap_StatementScenarioAxis = avd_CountryOneMember

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The number of claims settled and dismissed during the period.

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-Name Accounting Standards Codification

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