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Components of Basic and Diluted Earnings Per Share (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Numerator:        
Net income attributable to American Vanguard $ 8,870 $ 8,076 $ 34,171 $ 25,554
Denominator:        
Weighted averages shares outstanding 28,322 27,970 28,295 27,818
Weighted average shares outstanding-assuming dilution 28,889 28,878 28,890 28,673
Stock Options
        
Denominator:        
Assumed exercise of stock options and restricted shares-fully diluted 567 908 595 855