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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, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Net sales
Net sales	$ 130,521	$ 124,884	$ 113,104	$ 99,676	$ 131,338	$ 111,780	$ 107,046	$ 104,108	$ 468,186	$ 454,272	$ 355,047
Gross profit	$ 46,536	$ 47,463	$ 41,653	$ 41,702	$ 52,983	$ 45,300	$ 43,297	$ 41,051	177,354	182,631	147,392
Crop
Net sales
Gross profit									140,806	150,986	117,892
Non-crop
Net sales
Gross profit									36,548	31,645	29,500
Insecticides
Net sales
Net sales									153,448	150,595	134,377
Herbicides/Soil Fumigants/Fungicides
Net sales
Net sales									181,686	183,350	124,529
Other, Including Plant Growth Regulators
Net sales
Net sales									67,266	58,360	42,503
Crop
Net sales
Net sales									402,400	392,305	301,409
Non-Crop
Net sales
Net sales									$ 65,786	$ 61,967	$ 53,638

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