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, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disaggregation Of Revenue [Line Items]
Net sales	$ 140,747	$ 117,439	$ 104,555	$ 95,962	$ 130,521	$ 124,884	$ 113,104	$ 99,676	$ 458,704	$ 468,186	$ 454,272
US Crop
Disaggregation Of Revenue [Line Items]
Net sales									223,167	220,635	240,855
US Non-Crop
Disaggregation Of Revenue [Line Items]
Net sales									48,557	61,590	59,459
Total US
Disaggregation Of Revenue [Line Items]
Net sales									271,724	282,225	300,314
International
Disaggregation Of Revenue [Line Items]
Net sales									186,980	185,961	$ 153,958
Goods and Services Transferred at a Point in Time
Disaggregation Of Revenue [Line Items]
Net sales									455,726	464,967
Goods and Services Transferred Over Time
Disaggregation Of Revenue [Line Items]
Net sales									$ 2,978	$ 3,219