Summary of Business Sales by Product and Geographic Location (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Net sales
Net sales	$ 77,905	$ 72,724	$ 148,578	$ 142,198
Insecticides
Net sales
Net sales	39,442	30,912	77,384	64,018
Herbicides/Soil Fumigants/Fungicides
Net sales
Net sales	16,045	21,093	36,066	45,767
Other, Including Plant Growth Regulators
Net sales
Net sales	10,096	6,331	13,488	9,820
Crop
Net sales
Net sales	65,583	58,336	126,938	119,605
Non-Crop
Net sales
Net sales	12,322	14,388	21,640	22,593
US
Net sales
Net sales	55,760	51,773	108,004	101,628
International
Net sales
Net sales	$ 22,145	$ 20,951	$ 40,574	$ 40,570