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Segment Reporting - Operating Segment (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Segment Reporting Information [Line Items] |  |  |  |
Net Sales | $ 519,866 | $ 495,101 | $ 1,019,201 | $ 963,370
Surfactants [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net Sales | 356,884 | 329,334 | 715,824 | 651,937
Polymers [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net Sales | 140,867 | 141,187 | 262,800 | 267,797
Specialty Products [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net Sales | $ 22,115 | $ 24,580 | $ 40,577 | $ 43,636

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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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