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Selected Quarterly Financial Data (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Sales | $ 473,823 | $ 487,814 | $ 495,101 | $ 468,269 | $ 420,636 | $ 445,030 | $ 454,603 | $ 445,897 | $ 1,925,007 | [1] | $ 1,766,166 | [1] | $ 1,776,167 | [1]
Gross Profit | 80,599 | 75,602 | 89,966 | 92,098 | 68,720 | 83,395 | 92,931 | 93,499 | 338,265 |  | 338,545 |  | 308,241 |
Operating income | 30,831 | 30,309 | 38,961 | 46,059 | 9,932 | 28,738 | 42,916 | 44,607 | 146,160 |  | 126,193 |  | 122,790 |
Interest, net | (2,826) | (2,763) | (2,863) | (2,992) | (3,350) | (2,824) | (3,417) | (3,614) | (11,444) |  | (13,205) |  | (14,533) |
Income Before Income Taxes | 28,532 | 29,312 | 37,063 | 44,330 | 7,009 | 27,143 | 39,196 | 40,468 | 139,237 |  | 113,816 |  | 102,856 |
Net Income | 9,886 | 21,853 | 27,896 | 31,912 | 8,411 | 21,367 | 28,501 | 27,919 | 91,547 |  | 86,198 |  | 76,037 |
Net income attributable to Stepan Company | $ 9,884 | $ 21,899 | $ 27,882 | $ 31,913 | $ 8,417 | $ 21,362 | $ 28,496 | $ 27,916 | $ 91,578 |  | $ 86,191 |  | $ 75,968 |
Diluted earnings per share | $ 0.42 | $ 0.94 | $ 1.19 | $ 1.37 | $ 0.36 | $ 0.92 | $ 1.24 | $ 1.22 | $ 3.92 |  | $ 3.73 |  | $ 3.32 |
[1] | Net sales are attributed to countries based on the location of the Company facility making the sales.

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