Business Restructuring - Additional Information (Detail)	3 Months Ended			9 Months Ended
	Dec. 31, 2014 USD ($) Employees	Sep. 30, 2014 Employees	Dec. 31, 2013 USD ($)	Sep. 30, 2014 USD ($)
2014 Restructuring [Member]
Restructuring Cost And Reserve [Line Items]
Number positions eliminated | Employees	13
Restructuring charges	$ 1,722,000
2013 Restructuring [Member] | Surfactants [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring charges			$ 1,040,000
Accelerated depreciation expenses				$ 1,825,000
2013 Restructuring [Member] | North America [Member] | Surfactants [Member]
Restructuring Cost And Reserve [Line Items]
Number positions eliminated | Employees		16