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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, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | $ 473,003 | $ 519,866 | $ 962,173 | $ 1,019,201
North America [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | 294,221 | 323,669 | 595,866 | 632,362
Europe [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | 101,365 | 114,534 | 218,264 | 238,337
Latin America [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | 55,407 | 57,212 | 106,416 | 99,727
Asia [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | 22,010 | 24,451 | 41,627 | 48,775
Surfactants [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | 313,380 | 356,884 | 663,030 | 715,824
Surfactants [Member] | North America [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | 191,720 | 218,029 | 406,017 | 438,434
Surfactants [Member] | Europe [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | 54,360 | 66,065 | 125,838 | 144,436
Surfactants [Member] | Latin America [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | 53,957 | 56,579 | 104,769 | 98,267
Surfactants [Member] | Asia [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | 13,343 | 16,211 | 26,406 | 34,687
Polymers [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | 140,636 | 140,867 | 260,815 | 262,800
Polymers [Member] | North America [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | 86,434 | 86,966 | 157,757 | 160,440
Polymers [Member] | Europe [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | 44,085 | 45,028 | 86,190 | 86,812
Polymers [Member] | Latin America [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | 1,450 | 633 | 1,647 | 1,460
Polymers [Member] | Asia [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | 8,667 | 8,240 | 15,221 | 14,088
Specialty Products [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | 18,987 | 22,115 | 38,328 | 40,577
Specialty Products [Member] | North America [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | 16,067 | 18,674 | 32,092 | 33,488
Specialty Products [Member] | Europe [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | 2,920 | 3,441 | 6,236 | 7,089
Specialty Products [Member] | Latin America [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | 0 | 0 | 0 | 0
Specialty Products [Member] | Asia [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | $ 0 | $ 0 | $ 0 | $ 0

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