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Components of Basic and Diluted Earnings Per Share (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Numerator:        
Net income attributable to AVD $ 145 $ 8,386 $ 2,304 $ 25,301
Denominator:        
Weighted averages shares outstanding-basic 28,408 28,295 28,404 28,280
Dilutive effect of stock options and grants 387 591 473 604
Weighted average shares outstanding-assuming dilution 28,795 28,886 28,877 28,884