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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, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Numerator:                      
Net income attributable to American Vanguard $ 11,313 $ 8,076 $ 8,744 $ 8,734 $ 6,431 $ 4,618 $ 6,007 $ 5,012 $ 36,867 $ 22,068 $ 10,984
Denominator:                      
Weighted average shares outstanding-basic                 27,914 27,559 27,385
Weighted average shares outstanding-assuming dilution                 28,756 27,875 27,652
Stock Options
                      
Denominator:                      
Assumed exercise of stock options-fully dilutive                 842 316 267