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Summary of Selective Enterprise Information of Sales Disaggregated By Category and Geographic Region (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	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
Disaggregation Of Revenue [Line Items]
Net sales	$ 131,338	$ 111,780	$ 107,046	$ 104,108	$ 116,494	$ 89,975	$ 77,905	$ 70,673	$ 454,272	$ 355,047	$ 312,113
Insecticides
Disaggregation Of Revenue [Line Items]
Net sales									150,595	134,377	119,226
Herbicides/Soil Fumigants/Fungicides
Disaggregation Of Revenue [Line Items]
Net sales									183,350	124,529	123,540
Other, Including Plant Growth Regulators and Distribution
Disaggregation Of Revenue [Line Items]
Net sales									58,360
Crop
Disaggregation Of Revenue [Line Items]
Net sales									392,305	301,409	272,204
Non-crop, Including Distribution
Disaggregation Of Revenue [Line Items]
Net sales									61,967
Goods Transferred at a Point in Time
Disaggregation Of Revenue [Line Items]
Net sales									453,449
Goods and Services Transferred Over Time
Disaggregation Of Revenue [Line Items]
Net sales									823
US
Disaggregation Of Revenue [Line Items]
Net sales									300,314
International
Disaggregation Of Revenue [Line Items]
Net sales									153,958	$ 98,905	$ 83,259
Balances without adoption of ASC 606
Disaggregation Of Revenue [Line Items]
Net sales									452,815
Balances without adoption of ASC 606 | Insecticides
Disaggregation Of Revenue [Line Items]
Net sales									150,638
Balances without adoption of ASC 606 | Herbicides/Soil Fumigants/Fungicides
Disaggregation Of Revenue [Line Items]
Net sales									183,350
Balances without adoption of ASC 606 | Other, Including Plant Growth Regulators and Distribution
Disaggregation Of Revenue [Line Items]
Net sales									58,360
Balances without adoption of ASC 606 | Crop
Disaggregation Of Revenue [Line Items]
Net sales									392,348
Balances without adoption of ASC 606 | Non-crop, Including Distribution
Disaggregation Of Revenue [Line Items]
Net sales									60,467
Balances without adoption of ASC 606 | Goods Transferred at a Point in Time
Disaggregation Of Revenue [Line Items]
Net sales									452,815
Balances without adoption of ASC 606 | US
Disaggregation Of Revenue [Line Items]
Net sales									298,857
Balances without adoption of ASC 606 | International
Disaggregation Of Revenue [Line Items]
Net sales									$ 153,958

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