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Components of Basic and Diluted Earnings Per Share (Detail) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Numerator:
Net income attributable to American Vanguard	$ 7,908	$ 2,927	$ 3,887	$ 520	$ 3,436	$ 3,153	$ 3,106	$ 3,906	$ 15,242	$ 13,601	$ 24,195
Denominator:
Weighted average shares outstanding—basic									29,450	29,030	29,326
Dilutive effect of stock options and grants									543	626	722
Weighted average shares outstanding—diluted									29,993	29,656	30,048

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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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