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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.