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Segment Reporting - Operating Segment (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
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
Segment Reporting Information [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]
Operating income |  | 39,385 | $ 27,694 | $ 44,685 | $ 39,655 | 31,398 | $ 30,434 | $ 39,133 | $ 46,230 | 151,419 | [2] | 147,195 | [2] | 127,830 | [2]
Assets |  | 1,484,666 |  |  |  | 1,470,861 |  |  |  | 1,484,666 |  | 1,470,861 |  | 1,353,890 |
Capital expenditures |  |  |  |  |  |  |  |  |  | 86,647 |  | 78,613 |  | 103,076 |
Depreciation and amortization expenses |  |  |  |  |  |  |  |  |  | 81,115 |  | 79,022 |  | 74,967 |
Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  | 1,993,857 |  | 1,925,007 |  | 1,766,166 |
Operating income | [2] |  |  |  |  |  |  |  |  | 213,706 |  | 213,777 |  | 208,919 |
Assets |  | 1,285,200 |  |  |  | 1,311,932 |  |  |  | 1,285,200 |  | 1,311,932 |  | 1,208,697 |
Capital expenditures |  |  |  |  |  |  |  |  |  | 84,398 |  | 75,780 |  | 100,205 |
Depreciation and amortization expenses |  |  |  |  |  |  |  |  |  | 78,917 |  | 77,119 |  | 73,122 |
Surfactants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  | 1,385,932 |  | 1,297,555 |  | 1,181,563 |
Surfactants [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  | 1,385,932 |  | 1,297,555 |  | 1,181,563 |
Operating income |  |  |  |  |  |  |  |  |  | 137,506 |  | 120,861 | [2] | 101,092 | [2]
Assets |  | 850,553 |  |  |  | 881,415 |  |  |  | 850,553 |  | 881,415 |  | 831,324 |
Capital expenditures |  |  |  |  |  |  |  |  |  | 51,543 |  | 50,400 |  | 64,121 |
Depreciation and amortization expenses |  |  |  |  |  |  |  |  |  | 50,514 |  | 49,102 |  | 48,643 |
Polymers [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  | 527,420 |  | 546,634 |  | 498,826 |
Polymers [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  | 527,420 |  | 546,634 |  | 498,826 |
Operating income |  |  |  |  |  |  |  |  |  | 64,539 |  | 82,951 | [2] | 97,102 | [2]
Assets |  | 351,690 |  |  |  | 355,065 |  |  |  | 351,690 |  | 355,065 |  | 301,890 |
Capital expenditures |  |  |  |  |  |  |  |  |  | 26,663 |  | 21,146 |  | 31,890 |
Depreciation and amortization expenses |  |  |  |  |  |  |  |  |  | 23,253 |  | 22,998 |  | 20,275 |
Specialty Products [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  | 80,505 |  | 80,818 |  | 85,777 |
Specialty Products [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  | 80,505 |  | 80,818 |  | 85,777 |
Operating income |  |  |  |  |  |  |  |  |  | 11,661 |  | 9,965 | [2] | 10,725 | [2]
Assets |  | $ 82,957 |  |  |  | $ 75,452 |  |  |  | 82,957 |  | 75,452 |  | 75,483 |
Capital expenditures |  |  |  |  |  |  |  |  |  | 6,192 |  | 4,234 |  | 4,194 |
Depreciation and amortization expenses |  |  |  |  |  |  |  |  |  | $ 5,150 |  | $ 5,019 |  | $ 4,204 |
[1] | Net sales are attributed to countries based on the location of the Company facility making the sales.
[2] | The 2017 and 2016 amounts for the noted line items have been immaterially changed from the amounts originally reported as a result of the Company’s first quarter 2018 adoption of ASU No. 2017-7, Compensation –Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost.

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