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Revenue from Contracts with Customers - Summary of Geographic Disaggregation of Net Sales (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | $ 519,866 | $ 495,101 | $ 1,019,201 | $ 963,370
North America [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | 323,669 | 302,144 | 632,362 | 593,686
Europe [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | 114,534 | 120,520 | 238,337 | 230,467
Latin America [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | 57,212 | 49,519 | 99,727 | 94,322
Asia [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | 24,451 | 22,918 | 48,775 | 44,895
Surfactants [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | 356,884 | 329,334 | 715,824 | 651,937
Surfactants [Member] | North America [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | 218,029 | 199,016 | 438,434 | 397,259
Surfactants [Member] | Europe [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | 66,065 | 65,289 | 144,436 | 128,712
Surfactants [Member] | Latin America [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | 56,579 | 48,559 | 98,267 | 92,064
Surfactants [Member] | Asia [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | 16,211 | 16,470 | 34,687 | 33,902
Polymers [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | 140,867 | 141,187 | 262,800 | 267,797
Polymers [Member] | North America [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | 86,966 | 86,925 | 160,440 | 165,289
Polymers [Member] | Europe [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | 45,028 | 46,854 | 86,812 | 89,257
Polymers [Member] | Latin America [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | 633 | 960 | 1,460 | 2,258
Polymers [Member] | Asia [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | 8,240 | 6,448 | 14,088 | 10,993
Specialty Products [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | 22,115 | 24,580 | 40,577 | 43,636
Specialty Products [Member] | North America [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | 18,674 | 16,203 | 33,488 | 31,138
Specialty Products [Member] | Europe [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | $ 3,441 | $ 8,377 | $ 7,089 | $ 12,498

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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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