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Revenue from Contracts with Customers - Summary of Geographic Disaggregation of Net Sales (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 466,659 | $ 507,997 | $ 519,866 | $ 499,335 | $ 473,823 | $ 487,814 | $ 495,101 | $ 468,269 | $ 1,993,857 | [1] | $ 1,925,007 | [1] | $ 1,766,166 | [1]
North America [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 1,223,153 |  | 1,159,579 |  | 1,114,089 |
Europe [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 461,678 |  | 477,277 |  | 407,551 |
Latin America [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 216,287 |  | 195,253 |  | 155,869 |
Asia [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 92,739 |  | 92,898 |  | 88,657 |
Surfactants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 1,385,932 |  | 1,297,555 |  | 1,181,563 |
Surfactants [Member] | North America [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 831,592 |  | 763,044 |  | 724,619 |
Surfactants [Member] | Europe [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 276,742 |  | 275,121 |  | 237,489 |
Surfactants [Member] | Latin America [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 212,824 |  | 190,802 |  | 151,229 |
Surfactants [Member] | Asia [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 64,774 |  | 68,588 |  | 68,226 |
Polymers [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 527,420 |  | 546,634 |  | 498,826 |
Polymers [Member] | North America [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 323,360 |  | 329,629 |  | 319,769 |
Polymers [Member] | Europe [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 172,632 |  | 188,244 |  | 153,986 |
Polymers [Member] | Latin America [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 3,463 |  | 4,451 |  | 4,640 |
Polymers [Member] | Asia [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 27,965 |  | 24,310 |  | 20,431 |
Specialty Products [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 80,505 |  | 80,818 |  | 85,777 |
Specialty Products [Member] | North America [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 68,201 |  | 66,906 |  | 69,701 |
Specialty Products [Member] | Europe [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | $ 12,304 |  | $ 13,912 |  | $ 16,076 |
[1] | Net sales are attributed to countries based on the location of the Company facility making the sales.

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