Business Restructuring - Additional Information (Detail)	3 Months Ended				6 Months Ended	9 Months Ended
	Dec. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Jun. 30, 2016 USD ($)	Sep. 30, 2016 USD ($) Employees
Restructuring Cost And Reserve [Line Items]
Business restructuring						$ 1,061,000
Ethoxylation Assets [Member]
Restructuring Cost And Reserve [Line Items]
Depreciation expense				$ 1,084,000
Longford Mills [Member] | Surfactants [Member]
Restructuring Cost And Reserve [Line Items]
Number positions eliminated | Employees						30
Depreciation expense		$ 1,295,000				$ 3,222,000
Longford Mills [Member] | Surfactants [Member] | Scenario Forecast [Member]
Restructuring Cost And Reserve [Line Items]
Depreciation expense	$ 1,300,000
Longford Mills [Member] | Surfactants [Member] | Termination Benefits [Member]
Restructuring Cost And Reserve [Line Items]
Business restructuring			$ 1,061,000		$ 1,061,000
Longford Mills [Member] | Surfactants [Member] | Plant Consolidation Expenses [Member]
Restructuring Cost And Reserve [Line Items]
Expected amount of restructuring expenses		$ 3,000,000				$ 3,000,000