Summary of Business Sales by Product and Geographic Location (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Net sales
Net sales	$ 70,673	$ 69,474
Insecticides
Net sales
Net sales	37,942	33,106
Herbicides/Soil Fumigants/Fungicides
Net sales
Net sales	20,021	24,685
Other, Including Plant Growth Regulators
Net sales
Net sales	3,392	3,277
Crop
Net sales
Net sales	61,355	61,068
Non-Crop
Net sales
Net sales	9,318	8,406
US
Net sales
Net sales	52,244	49,855
International
Net sales
Net sales	$ 18,429	$ 19,619