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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, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Numerator:
Net income attributable to American Vanguard	$ 8,429	$ 4,089	$ 4,304	$ 3,452	$ 3,871	$ 2,877	$ 3,246	$ 2,794	$ 20,274	$ 12,788	$ 6,591
Denominator:
Weighted average shares outstanding—basic									29,100	28,859	28,673
Dilutive effect of stock options and grants									603	535	564
Weighted average shares outstanding-assuming dilution									29,703	29,394	29,237

X

- Definition

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.

+ References

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-Publisher FASB
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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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