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Components of Basic and Diluted Earnings Per Share (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Numerator:        
Net income attributable to American Vanguard $ 8,386 $ 8,744 $ 25,301 $ 17,478
Denominator:        
Weighted averages shares outstanding-basic 28,295 27,858 28,280 27,740
Weighted average shares outstanding-assuming dilution 28,886 28,737 28,884 28,544
Stock Options
        
Denominator:        
Assumed exercise of stock options and restricted shares-fully diluted 591 879 604 804