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Components of Basic and Diluted Earnings Per Share (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Numerator:
Net income attributable to American Vanguard	$ 16,915	$ 8,734
Denominator:
Weighted averages shares outstanding-basic	28,269	27,624
Weighted average shares outstanding-assuming dilution	28,879	28,299
Stock Options
Denominator:
Assumed exercise of stock options and restricted shares-fully diluted	610	675

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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