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Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
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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
Computation of Basic Earnings per Share |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to Stepan Company |  | $ 12,872 | $ 24,912 | $ 16,914 | $ 21,270 | $ 6,239 | $ 13,491 | $ 24,353 | $ 13,018 | $ 75,968 | $ 57,101 | $ 72,828
Deduct dividends on preferred stock |  |  |  |  |  |  |  |  |  |  |  | 43
Income applicable to common stock |  |  |  |  |  |  |  |  |  | $ 75,968 | $ 57,101 | $ 72,871
Weighted-average number of shares outstanding |  |  |  |  |  |  |  |  |  | 22,730 | 22,758 | 22,621
Basic earnings per share |  |  |  |  |  |  |  |  |  | $ 3.34 | $ 2.51 | $ 3.22
Computation of Diluted Earnings per Share |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to Stepan Company |  |  |  |  |  |  |  |  |  | $ 75,968 | $ 57,101 | $ 72,828
Weighted-average number of shares outstanding |  |  |  |  |  |  |  |  |  | 22,730 | 22,758 | 22,621
Add weighted-average net shares from assumed exercise (under treasury share method) | [1] |  |  |  |  |  |  |  |  | 118 | 148 | 215
Add weighted-average net shares related to unvested stock awards (under treasury share method) |  |  |  |  |  |  |  |  |  | 3 | 11 | 8
Add weighted-average shares from assumed conversion of convertible preferred stock |  |  |  |  |  |  |  |  |  |  |  | 80
Weighted-average shares applicable to diluted earnings |  |  |  |  |  |  |  |  |  | 22,858 | 22,917 | 22,924
Diluted earnings per share |  | $ 0.56 | $ 1.09 | $ 0.74 | $ 0.93 | $ 0.27 | $ 0.59 | $ 1.06 | $ 0.57 | $ 3.32 | $ 2.49 | $ 3.18
Stock Appreciation Rights (SARs) [Member] |  |  |  |  |  |  |  |  |  |  |  |
Computation of Diluted Earnings per Share |  |  |  |  |  |  |  |  |  |  |  |
Add weighted-average net shares from assumed exercise (under treasury share method) |  |  |  |  |  |  |  |  |  | 1 |  |
Performance Stock Award [Member] |  |  |  |  |  |  |  |  |  |  |  |
Computation of Diluted Earnings per Share |  |  |  |  |  |  |  |  |  |  |  |
Add weighted-average net shares from assumed exercise (under treasury share method) |  |  |  |  |  |  |  |  |  | 6 |  |
[1] | Options to purchase 124,531, 99,044 and 49,815 shares of common stock were not included in the computations of diluted earnings per share for the years ended December 31, 2015, 2014 and 2013, respectively. The options’ exercise prices were greater than the average market price for the common stock and the effect of the options on earnings per share would have been antidilutive.

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