Business Restructuring - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2017 USD ($) Employees
Restructuring Cost And Reserve [Line Items]
Business restructuring	$ 786,000
Other Expense [Member]
Restructuring Cost And Reserve [Line Items]
Business restructuring	786,000
Longford Mills [Member] | Surfactants [Member]
Restructuring Cost And Reserve [Line Items]
Business restructuring	$ 3,603,000
Number positions eliminated | Employees	30
Expected restructuring expenses	$ 4,500,000
Longford Mills [Member] | Surfactants [Member] | Termination Benefits [Member]
Restructuring Cost And Reserve [Line Items]
Business restructuring	1,594,000
Longford Mills [Member] | Surfactants [Member] | Other Expense [Member]
Restructuring Cost And Reserve [Line Items]
Business restructuring	$ 2,009,000