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Summary of Business Sales Segmentation as per Product (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Net sales:                      
Total crop                 $ 346,514 $ 329,540 $ 272,068
Non-crop                 34,507 36,650 29,012
Total Sales 75,522 97,201 86,761 121,537 104,262 89,836 84,837 87,255 381,021 366,190 301,080
Gross profit 32,341 43,159 42,066 53,781 45,776 39,625 38,346 37,378 171,347 161,125 123,068
Crop
                      
Net sales:                      
Gross profit                 155,275 142,019 110,348
Non-crop
                      
Net sales:                      
Gross profit                 16,072 19,106 12,720
Insecticides
                      
Net sales:                      
Total crop                 193,623 194,060 137,460
Herbicides/Soil Fumigants/Fungicides
                      
Net sales:                      
Total crop                 121,042 89,899 90,782
Other Including Plant Growth Regulators
                      
Net sales:                      
Total crop                 $ 31,849 $ 45,581 $ 43,826