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Components of Basic and Diluted Earnings Per Share (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Numerator:              
Net income attributable to American Vanguard $ 278 $ 8,870 $ 8,386 $ 16,915 $ 34,449 $ 36,867 $ 22,068
Denominator:              
Weighted average shares outstanding-basic         28,301 27,914 27,559
Weighted average shares outstanding-assuming dilution         28,899 28,756 27,875
Stock Options
              
Denominator:              
Dilutive effect of stock options and grants         598 842 316