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Components of Basic and Diluted Earnings Per Share (Detail) - USD ($)
shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Numerator:        
Net income attributable to AVD $ 3,246 $ 781 $ 6,040 $ 832
Denominator:        
Weighted average shares outstanding-basic 28,893 28,676 28,851 28,602
Dilutive effect of stock options and grants 484 526 491 501
Weighted average shares outstanding-assuming dilution 29,377 29,202 29,342 29,103