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Document and Entity Information - shares
 9 Months Ended
Sep. 30, 2019
Oct. 29, 2019
Cover [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Sep. 30, 2019  
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q3  
Trading Symbol AVD  
Entity Registrant Name AMERICAN VANGUARD CORP  
Entity Central Index Key 0000005981  
Current Fiscal Year End Date --12-31  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Title of 12(b) Security Common Stock, $.10 par value  
Security Exchange Name NYSE  
Entity File Number 001-13795  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 95-2588080  
Entity Address, Address Line One 4695 MacArthur Court  
Entity Address, City or Town Newport Beach  
Entity Address, State or Province CA  
Entity Address, Postal Zip Code 92660  
City Area Code 949  
Local Phone Number 260-1200  
Document Quarterly Report true  
Document Transition Report false  
Entity Common Stock, Shares Outstanding   30,186,844