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Selected Quarterly Financial Data (Detail) - USD ($) $ / shares in Units, $ 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
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
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]
Gross Profit | 78,528 | 84,125 | 89,280 | 89,570 | 80,839 | 75,576 | 89,988 | 92,119 | 341,503 | [2] | 338,522 | [2] | 339,269 | [2]
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]
Interest, net | (2,151) | (2,797) | (2,672) | (3,151) | (2,826) | (2,763) | (2,863) | (2,992) | (10,771) |  | (11,444) |  | (13,205) |
Income Before Income Taxes | 34,519 | 25,243 | 42,497 | 37,664 | 28,532 | 29,312 | 37,063 | 44,330 | 139,923 |  | 139,237 |  | 113,816 |
Net Income | 26,943 | 22,168 | 32,923 | 30,716 | 9,886 | 21,853 | 27,896 | 31,912 | 112,750 |  | 91,547 |  | 86,198 |
Net income attributable to Stepan Company | $ 26,946 | $ 22,168 | $ 32,925 | $ 30,723 | $ 9,884 | $ 21,899 | $ 27,882 | $ 31,913 | $ 112,762 |  | $ 91,578 |  | $ 86,191 |
Diluted earnings per share | $ 1.16 | $ 0.95 | $ 1.41 | $ 1.31 | $ 0.42 | $ 0.94 | $ 1.19 | $ 1.37 | $ 4.83 |  | $ 3.92 |  | $ 3.73 |
[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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