Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

+ Details

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Balance Type:	na
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- Definition

The value (monetary amount) of the award the plaintiff seeks in the legal matter.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14326-108349

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 9
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14557-108349

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
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-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14435-108349

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Balance Type:	debit
Period Type:	duration

- Definition

Reflects the estimated amount of loss from the specified contingency as of the balance sheet date.

+ 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 (b)
-URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14435-108349

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 9
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14557-108349

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The total number of new claims filed pertaining to a loss contingency during the period.

+ References

+ Details

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Data Type:	xbrli:integerItemType
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- Details

Name:	us-gaap_LitigationCaseAxis=avd_HaroldReedAndAlbertaLtdDbaJemHoldingsClaimMember
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- Details

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- Details

Name:	us-gaap_LitigationCaseAxis=avd_JemHoldingsCrossClaimsMember
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- Details

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- Details

Name:	us-gaap_LitigationCaseAxis=avd_VanGiessenGrowersIncCrossClaimsMember
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- Details

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Legal Proceedings - Additional Information (Detail) $ in Thousands		1 Months Ended
	Mar. 29, 2016 Case	Jan. 31, 2017 USD ($) Case
Harold Reed v. AMVAC et al.
Loss Contingencies [Line Items]
Number of lawsuits filed \| Case	2
Reed
Loss Contingencies [Line Items]
Loss contingency damages sought, value		$ 250
Jem Holdings
Loss Contingencies [Line Items]
Loss contingency damages sought, value		$ 60
Cross Claims
Loss Contingencies [Line Items]
Number of lawsuits filed \| Case		4
Van Giessen Growers, Inc.
Loss Contingencies [Line Items]
Loss contingency estimate of possible loss		$ 400
Chin Coulee Farms
Loss Contingencies [Line Items]
Loss contingency estimate of possible loss		530
Houweling Farms
Loss Contingencies [Line Items]
Loss contingency estimate of possible loss		$ 4,300