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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, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Numerator:                      
Net income attributable to American Vanguard $ 3,436 $ 3,153 $ 3,106 $ 3,906 $ 7,416 $ 6,525 $ 5,599 $ 4,655 $ 13,601 $ 24,195 $ 20,274
Denominator:                      
Weighted average shares outstanding—basic                 29,030 29,326 29,100
Dilutive effect of stock options and grants                 626 722 603
Weighted average shares outstanding—diluted                 29,656 30,048 29,703