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Components of Basic and Diluted Earnings Per Share (Detail) - USD ($)
shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Numerator:    
Net income attributable to AVD $ 2,794 $ 51
Denominator:    
Weighted average shares outstanding-basic 28,808 28,527
Dilutive effect of stock options and grants 499 312
Weighted average shares outstanding-assuming dilution 29,307 28,839