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Summary of Selective Enterprise Information of Sales Disaggregated By Category and Geographic Region (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Disaggregation Of Revenue [Line Items]
Net sales	$ 111,780	$ 89,975	$ 322,934	$ 238,553
Insecticides
Disaggregation Of Revenue [Line Items]
Net sales	25,475	24,866	99,433	102,249
Herbicides/Soil Fumigants/Fungicides
Disaggregation Of Revenue [Line Items]
Net sales	34,577	32,717	98,163	68,783
Other, Including Plant Growth Regulators and Distribution
Disaggregation Of Revenue [Line Items]
Net sales	35,302		83,519
Crop
Disaggregation Of Revenue [Line Items]
Net sales	95,354	74,774	281,115	201,712
Non-crop, Including Distribution
Disaggregation Of Revenue [Line Items]
Net sales	16,426		41,819
US
Disaggregation Of Revenue [Line Items]
Net sales	71,711	65,842	205,889	173,877
International
Disaggregation Of Revenue [Line Items]
Net sales	40,069	$ 24,133	117,045	$ 64,676
Goods Transferred at a Point in Time
Disaggregation Of Revenue [Line Items]
Net sales	111,675		322,266
Goods and Services Transferred Over Time
Disaggregation Of Revenue [Line Items]
Net sales	105		668
Balances without adoption of ASC 606
Disaggregation Of Revenue [Line Items]
Net sales	111,786		322,964
Balances without adoption of ASC 606 | Insecticides
Disaggregation Of Revenue [Line Items]
Net sales	25,481		99,463
Balances without adoption of ASC 606 | Herbicides/Soil Fumigants/Fungicides
Disaggregation Of Revenue [Line Items]
Net sales	34,577		98,163
Balances without adoption of ASC 606 | Other, Including Plant Growth Regulators and Distribution
Disaggregation Of Revenue [Line Items]
Net sales	35,302		83,519
Balances without adoption of ASC 606 | Crop
Disaggregation Of Revenue [Line Items]
Net sales	95,360		281,145
Balances without adoption of ASC 606 | Non-crop, Including Distribution
Disaggregation Of Revenue [Line Items]
Net sales	16,426		41,819
Balances without adoption of ASC 606 | US
Disaggregation Of Revenue [Line Items]
Net sales	71,717		205,919
Balances without adoption of ASC 606 | International
Disaggregation Of Revenue [Line Items]
Net sales	40,069		117,045
Balances without adoption of ASC 606 | Goods Transferred at a Point in Time
Disaggregation Of Revenue [Line Items]
Net sales	$ 111,786		$ 322,964

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