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Segment Reporting - Reconciliation of Segment Information to Consolidated Financial Statements (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Segment Reporting Information [Line Items] |  |  |  |  |
Operating income |  | $ 42,916 | $ 28,595 | $ 87,523 | $ 63,773
Business restructuring |  | (1,061) |  | (1,061) |
Interest expense, net |  | (3,417) | (2,869) | (7,031) | (6,923)
Loss from equity in joint ventures (Note 16) |  |  | (1,815) |  | (3,055)
Other, net |  | (303) | 235 | (828) | 887
Income Before Provision for Income Taxes |  | 39,196 | 24,146 | 79,664 | 54,682
Operating Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating income |  | 60,014 | 49,183 | 121,789 | 99,976
Operating Segments [Member] | Surfactants [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating income |  | 27,232 | 24,232 | 64,477 | 57,996
Operating Segments [Member] | Polymers [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating income |  | 30,994 | 23,429 | 53,191 | 38,214
Operating Segments [Member] | Specialty Products [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating income |  | 1,788 | 1,522 | 4,121 | 3,766
Segment Reconciling Items [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Unallocated corporate expenses | [1] | $ (16,037) | $ (20,588) | $ (33,205) | $ (36,203)
[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.

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- Definition Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 20 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=68072869&loc=d3e41242-110953 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(10)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(15)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(8)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 + Details
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