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Segment Reporting - Reconciliation of Segment Information to Consolidated Financial Statements (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Segment Reporting Information [Line Items]        
Operating income $ 38,794 $ 22,253 $ 102,567 $ 81,690
Interest expense, net (3,837) (2,846) (10,760) (8,824)
Loss from equity in joint ventures (863) (1,148) (3,918) (3,842)
Other, net (981) (31) (94) 499
Income Before Provision for Income Taxes 33,113 18,228 87,795 69,523
Operating Segments [Member]        
Segment Reporting Information [Line Items]        
Operating income 46,082 32,412 146,058 106,830
Operating Segments [Member] | Surfactants [Member]        
Segment Reporting Information [Line Items]        
Operating income 21,762 11,115 79,758 48,692
Operating Segments [Member] | Polymers [Member]        
Segment Reporting Information [Line Items]        
Operating income 24,588 18,268 62,802 47,538
Operating Segments [Member] | Specialty Products [Member]        
Segment Reporting Information [Line Items]        
Operating income (268) 3,029 3,498 10,600
Segment Reconciling Items [Member]        
Segment Reporting Information [Line Items]        
Unallocated corporate expenses [1] $ (7,288) $ (10,159) $ (43,491) $ (25,140)
[1] Unallocated corporate expenses primarily comprise corporate administrative expenses (e.g., corporate finance, legal, human resources, information systems, deferred compensation and environmental remediation) that are not included in segment operating income and not used to evaluate segment performance.