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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, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Numerator:                      
Net income attributable to American Vanguard $ 3,871 $ 2,877 $ 3,246 $ 2,794 $ 2,987 $ 2,772 $ 781 $ 51 $ 12,788 $ 6,591 $ 4,841
Denominator:                      
Weighted average shares outstanding—basic                 28,859 28,673 28,436
Dilutive effect of stock options and grants                 535 564 476
Weighted average shares outstanding-assuming dilution                 29,394 29,237 28,912