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Stock Based Compensation Expense - Additional Information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 6 Months Ended
Jun. 30, 2013
Mar. 31, 2013
Jun. 30, 2013
Stock Options
Jun. 30, 2012
Stock Options
Jun. 30, 2013
Stock Options
Jun. 30, 2013
Restricted Stock
Jun. 30, 2013
Restricted Stock
Jun. 30, 2012
Restricted Stock
Jun. 30, 2012
Restricted Stock
Vested immediately
Jun. 30, 2013
Performance Shares
Jun. 30, 2013
Performance Shares
Jun. 30, 2013
Performance Shares
Maximum
Jun. 30, 2013
Performance Shares
Performance based shares based upon net income and net sales for the period commencing April 1, 2013 and ending December 31, 2015
Jun. 30, 2013
Performance Shares
Performance based shares based upon AVD stock price appreciation over the course of the period commencing June 6, 2013 and ending on December 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Stock-based compensation expense     $ 423 $ 432     $ 1,297 $ 599     $ 26      
Nonvested unamortized stock-based compensation expense, value     400   400 7,132 7,132              
Nonvested unamortized stock-based compensation expense, contractual term         6 months 2 years 3 months 18 days       2 years 10 months 24 days        
Number of Shares, Granted 8,230 145,884         154,114 207,184   26,942 26,942      
Number of shares expected to vest             3,000              
Vesting Description             Vest one-third each year on the anniversaries of the employee's employment date              
Number of shares vested 8,230           8,230 82,640 12,204          
Expenses recognized period             3 years 3 years     3 years      
Weighted Average Grant-Date Fair Value, Granted $ 30.37 $ 31.27         $ 31.22 $ 20.45   $ 30.13     $ 30.13 $ 15.31
Weighted Average Grant-Date Fair Value, Vested $ 30.37             $ 11.73            
Average vest date value Restricted share               $ 17.58            
Number of Shares, Forfeited   8,000           1,367            
Weighted Average Grant-Date Fair Value, Forfeited   $ 22.17           $ 20.47            
Percentage of shares vesting based on Performance                         80.00% 20.00%
Targeted performance percentage                       200.00%    
Unamortized stock-based compensation expense                   $ 716 $ 716