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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, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Numerator:
Net income attributable to American Vanguard	$ 7,416	$ 6,525	$ 5,599	$ 4,655	$ 8,429	$ 4,089	$ 4,304	$ 3,452	$ 24,195	$ 20,274	$ 12,788
Denominator:
Weighted average shares outstanding—basic									29,326	29,100	28,859
Dilutive effect of stock options and grants									722	603	535
Weighted average shares outstanding-assuming dilution									30,048	29,703	29,394

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.

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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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