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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2019
Earnings Per Share [Abstract] |
Computation of Basic and Diluted Earnings Per Share | Below is the computation of basic and diluted earnings per share for the years ended December 31, 2019, 2018 and 2017:
(In thousands, except per share amounts) |  | 2019 |  |  | 2018 |  |  | 2017 |
Computation of Basic Earnings per Share |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to Stepan Company (1) |  | $ | 103,129 |  |  | $ | 111,117 |  |  | $ | 100,774 |
Weighted-average number of shares outstanding |  |  | 23,054 |  |  |  | 23,022 |  |  |  | 22,946 |
Basic earnings per share (1) |  | $ | 4.47 |  |  | $ | 4.83 |  |  | $ | 4.39 |
Computation of Diluted Earnings per Share |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to Stepan Company (1) |  | $ | 103,129 |  |  | $ | 111,117 |  |  | $ | 100,774 |
Weighted-average number of shares outstanding |  |  | 23,054 |  |  |  | 23,022 |  |  |  | 22,946 |
Add weighted-average net shares from assumed exercise of options (under treasury share method) (2) |  |  | 97 |  |  |  | 101 |  |  |  | 161 |
Add weighted-average net shares related to unvested stock awards (under treasury share method) |  |  | 2 |  |  |  | 3 |  |  |  | 8 |
Add weighted-average net shares from assumed exercise of SARs (under treasury share method) |  |  | 125 |  |  |  | 110 |  |  |  | 142 |
Add weighted-average contingently issuable net shares related to performance stock awards (under treasury share method) |  |  | 38 |  |  |  | 89 |  |  |  | 120 |
Weighted-average shares applicable to diluted earnings |  |  | 23,316 |  |  |  | 23,325 |  |  |  | 23,377 |
Diluted earnings per share (1) |  | $ | 4.42 |  |  | $ | 4.76 |  |  | $ | 4.31 |
| (1) | The 2018 and 2017 amounts for the noted line items have been retrospectively changed from the amounts originally reported as a result of the Company’s first quarter 2019 change in method of accounting for U.S. inventory valuation from LIFO to FIFO. |
| (2) | Options/SARs to purchase 107,125, 50,770 and 18,630 shares of common stock were not included in the computations of diluted earnings per share for the years ended December 31, 2019, 2018 and 2017, respectively. The options’/SARs’ exercise prices were greater than the average market price for the common stock and the effect of the options/SARs on earnings per share would have been antidilutive. |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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