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Summary of Business Sales by Product and Geographic Location (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Net sales |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 116,494 | $ 89,975 | $ 77,905 | $ 70,673 | $ 87,468 | $ 82,447 | $ 72,724 | $ 69,474 | $ 355,047 | $ 312,113 | $ 289,382
Gross profit | $ 44,941 | $ 38,032 | $ 34,335 | $ 30,084 | $ 36,404 | $ 32,986 | $ 31,395 | $ 27,503 | 147,392 | 128,288 | 111,902
Crop |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |
Gross profit |  |  |  |  |  |  |  |  | 117,892 | 107,821 | 97,198
Non-crop |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |
Gross profit |  |  |  |  |  |  |  |  | 29,500 | 20,467 | 14,704
Insecticides |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 132,137 | 119,226 | 117,180
Herbicides/Soil Fumigants/Fungicides |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 121,581 | 123,540 | 111,897
Other, Including Plant Growth Regulators |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 47,691 | 29,438 | 29,013
Crop |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 301,409 | 272,204 | 258,090
Non-Crop |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | $ 53,638 | $ 39,909 | $ 31,292

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