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Components of Basic and Diluted Earnings Per Share (Detail) - USD ($)
shares in Thousands, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Numerator:        
Net income attributable to AVD $ 2,877 $ 2,772 $ 8,917 $ 3,604
Denominator:        
Weighted average shares outstanding-basic 28,957 28,753 28,886 28,653
Dilutive effect of stock options and grants 539 536 499 555
Weighted average shares outstanding-assuming dilution 29,496 29,289 29,385 29,208