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Summary of Business Sales Segmentation as per Location (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Net sales:                      
Total crop                 $ 329,540 $ 272,068 $ 203,393
Non-crop                 36,650 29,012 23,466
Total Sales 104,262 89,836 84,837 87,255 81,776 73,209 80,062 66,033 366,190 301,080 226,859
Gross profit 45,776 39,625 38,346 37,378 33,912 30,565 31,681 26,910 161,125 123,068 86,321
Crop
                      
Net sales:                      
Gross profit                 142,019 110,348 77,916
Non-crop
                      
Net sales:                      
Gross profit                 19,106 12,720 8,405
Insecticides
                      
Net sales:                      
Total crop                 194,060 137,460 84,500
Herbicides
                      
Net sales:                      
Total crop                 89,899 90,782 86,780
Other
                      
Net sales:                      
Total crop                 $ 45,581 $ 43,826 $ 32,113