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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

X

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Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
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