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Segment Reporting - Operating Segment (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Segment Reporting Information [Line Items]      
Net sales [1] $ 1,869,750 $ 1,858,745 $ 1,993,857
Operating income 171,522 127,260 149,265
Assets 1,752,336 1,579,367 1,514,614
Capital expenditures 125,792 105,572 86,647
Depreciation and amortization expenses 81,860 78,701 81,115
Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Net sales 1,869,750 1,858,745 1,993,857
Operating income 251,281 208,762 211,552
Assets 1,472,738 1,331,929 1,285,200
Capital expenditures 121,163 103,354 84,398
Depreciation and amortization expenses 77,988 76,056 78,917
Surfactants [Member]      
Segment Reporting Information [Line Items]      
Net sales 1,351,686 1,272,723 1,385,932
Surfactants [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Net sales 1,351,686 1,272,723 1,385,932
Operating income 169,101 122,780 133,518
Assets 1,018,555 907,032 850,553
Capital expenditures 88,484 69,725 51,543
Depreciation and amortization expenses 49,429 48,422 50,514
Polymers [Member]      
Segment Reporting Information [Line Items]      
Net sales 452,277 512,347 527,420
Polymers [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Net sales 452,277 512,347 527,420
Operating income 68,214 69,567 66,373
Assets 361,219 338,179 351,690
Capital expenditures 26,719 29,188 26,663
Depreciation and amortization expenses 22,873 22,151 23,253
Specialty Products [Member]      
Segment Reporting Information [Line Items]      
Net sales 65,787 73,675 80,505
Specialty Products [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Net sales 65,787 73,675 80,505
Operating income 13,966 16,415 11,661
Assets 92,964 86,718 82,957
Capital expenditures 5,960 4,441 6,192
Depreciation and amortization expenses $ 5,686 $ 5,483 $ 5,150
[1] Net sales are attributed to countries based on the location of the Company facility making the sales.