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Revenue from Contracts with Customers - Summary of Geographic Disaggregation of Net Sales (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Disaggregation Of Revenue [Line Items] |  |
Net sales | $ 499,335 | $ 468,269
North America [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Net sales | 308,693 | 291,542
Europe [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Net sales | 123,803 | 109,947
Latin America [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Net sales | 42,515 | 44,803
Asia [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Net sales | 24,324 | 21,977
Surfactants [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Net sales | 358,940 | 322,603
Surfactants [Member] | North America [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Net sales | 220,405 | 198,243
Surfactants [Member] | Europe [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Net sales | 78,371 | 63,423
Surfactants [Member] | Latin America [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Net sales | 41,688 | 43,505
Surfactants [Member] | Asia [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Net sales | 18,476 | 17,432
Polymers [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Net sales | 121,933 | 126,610
Polymers [Member] | North America [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Net sales | 73,474 | 78,364
Polymers [Member] | Europe [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Net sales | 41,784 | 42,403
Polymers [Member] | Latin America [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Net sales | 827 | 1,298
Polymers [Member] | Asia [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Net sales | 5,848 | 4,545
Specialty Products [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Net sales | 18,462 | 19,056
Specialty Products [Member] | North America [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Net sales | 14,814 | 14,935
Specialty Products [Member] | Europe [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Net sales | $ 3,648 | $ 4,121

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 32 -Paragraph 2A -URI http://asc.fasb.org/extlink&oid=82859839&loc=SL82860478-203043 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130543-203045 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130539-203045 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130545-203045 + Details
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