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Summary of Business Sales by Product and Geographic Location (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Net sales |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 131,338 | $ 111,780 | $ 107,046 | $ 104,108 | $ 116,494 | $ 89,975 | $ 77,905 | $ 70,673 | $ 454,272 | $ 355,047 | $ 312,113
Gross profit | $ 52,983 | $ 45,300 | $ 43,297 | $ 41,051 | $ 44,941 | $ 38,032 | $ 34,335 | $ 30,084 | 182,631 | 147,392 | 128,288
Crop |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |
Gross profit |  |  |  |  |  |  |  |  | 150,986 | 117,892 | 107,821
Non-crop |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |
Gross profit |  |  |  |  |  |  |  |  | 31,645 | 29,500 | 20,467
Insecticides |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 150,595 | 134,377 | 119,226
Herbicides/Soil Fumigants/Fungicides |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 183,350 | 124,529 | 123,540
Other, Including Plant Growth Regulators |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 58,360 | 42,503 | 29,438
Crop |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 392,305 | 301,409 | 272,204
Non-Crop |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | $ 61,967 | $ 53,638 | $ 39,909

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