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Segment Reporting - Operating Segment (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 419,291 | $ 444,011 | $ 452,414 | $ 460,451 | $ 454,231 | $ 491,429 | $ 504,111 | $ 477,442 | $ 1,776,167 | [1] | $ 1,927,213 | [1] | $ 1,880,786 | [1]
Operating income | 20,223 | $ 38,794 | $ 28,595 | $ 35,178 | 9,004 | $ 22,253 | $ 36,914 | $ 22,523 | 122,790 |  | 90,694 |  | 109,153 |
Assets | 1,239,661 |  |  |  | 1,162,014 |  |  |  | 1,239,661 |  | 1,162,014 |  | 1,167,202 |
Capital expenditures |  |  |  |  |  |  |  |  | 119,349 |  | 101,819 |  | 92,865 |
Depreciation and amortization expenses |  |  |  |  |  |  |  |  | 66,985 |  | 63,804 |  | 56,400 |
Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 1,776,167 |  | 1,927,213 |  | 1,880,786 |
Operating income |  |  |  |  |  |  |  |  | 189,419 |  | 131,955 |  | 165,639 |
Assets | 1,124,918 |  |  |  | 1,129,905 |  |  |  | 1,124,918 |  | 1,129,905 |  | 1,070,949 |
Capital expenditures |  |  |  |  |  |  |  |  | 116,867 |  | 98,823 |  | 91,440 |
Depreciation and amortization expenses |  |  |  |  |  |  |  |  | 65,322 |  | 62,708 |  | 55,382 |
Surfactants [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 1,205,849 |  | 1,296,638 |  | 1,317,164 |
Operating income |  |  |  |  |  |  |  |  | 104,080 |  | 60,778 |  | 100,201 |
Assets | 758,524 |  |  |  | 741,677 |  |  |  | 758,524 |  | 741,677 |  | 710,521 |
Capital expenditures |  |  |  |  |  |  |  |  | 79,171 |  | 70,796 |  | 66,266 |
Depreciation and amortization expenses |  |  |  |  |  |  |  |  | 42,122 |  | 41,483 |  | 36,400 |
Polymers [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 491,488 |  | 550,966 |  | 483,361 |
Operating income |  |  |  |  |  |  |  |  | 80,942 |  | 60,690 |  | 54,536 |
Assets | 293,790 |  |  |  | 320,640 |  |  |  | 293,790 |  | 320,640 |  | 292,015 |
Capital expenditures |  |  |  |  |  |  |  |  | 31,309 |  | 22,409 |  | 18,804 |
Depreciation and amortization expenses |  |  |  |  |  |  |  |  | 19,541 |  | 18,433 |  | 16,351 |
Specialty Products [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 78,830 |  | 79,609 |  | 80,261 |
Operating income |  |  |  |  |  |  |  |  | 4,397 |  | 10,487 |  | 10,902 |
Assets | $ 72,604 |  |  |  | $ 67,588 |  |  |  | 72,604 |  | 67,588 |  | 68,413 |
Capital expenditures |  |  |  |  |  |  |  |  | 6,387 |  | 5,618 |  | 6,370 |
Depreciation and amortization expenses |  |  |  |  |  |  |  |  | $ 3,659 |  | $ 2,792 |  | $ 2,631 |
[1] | Net sales are attributed to countries based on selling location.

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