Goodwill and Other Intangible Assets - Schedule of Changes in Carrying Value of Goodwill (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Goodwill [Line Items]
Goodwill, Beginning Balance	$ 14,969	$ 15,193
Accumulated impairment loss, Beginning Balance	(3,467)	(3,467)
Goodwill net, Beginning Balance	11,502	11,726
Foreign currency translation	(237)	(224)
Goodwill, Ending Balance	14,732	14,969
Accumulated impairment loss, Ending Balance	(3,467)	(3,467)
Goodwill net, Ending Balance	11,265	11,502
Surfactants Segment [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	9,025	9,107
Accumulated impairment loss, Beginning Balance	(3,467)	(3,467)
Goodwill net, Beginning Balance	5,558	5,640
Foreign currency translation	(156)	(82)
Goodwill, Ending Balance	8,869	9,025
Accumulated impairment loss, Ending Balance	(3,467)	(3,467)
Goodwill net, Ending Balance	5,402	5,558
Polymer Segment [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	5,461	5,603
Goodwill net, Beginning Balance	5,461	5,603
Foreign currency translation	(81)	(142)
Goodwill, Ending Balance	5,380	5,461
Goodwill net, Ending Balance	5,380	5,461
Specialty Products Segment [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	483	483
Goodwill net, Beginning Balance	483	483
Goodwill, Ending Balance	483	483
Goodwill net, Ending Balance	$ 483	$ 483