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Earnings Per Share (Tables) | 3 Months Ended
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Mar. 31, 2018
Earnings Per Share [Abstract] |
Computation of Basic and Diluted Earnings Per Share | Below are the computations of basic and diluted earnings per share for the three months ended March 31, 2018 and 2017:
(In thousands, except per share amounts) |  | Three Months Ended March 31 |
|  | 2018 |  |  | 2017 |
Computation of Basic Earnings per Share |  |  |  |  |  |  |  |
Net income attributable to Stepan Company |  | $ | 30,723 |  |  | $ | 31,913 |
Weighted-average number of common shares outstanding |  |  | 23,082 |  |  |  | 22,901 |
Basic earnings per share |  | $ | 1.33 |  |  | $ | 1.39 |
Computation of Diluted Earnings per Share |  |  |  |  |  |  |  |
Net income attributable to Stepan Company |  | $ | 30,723 |  |  | $ | 31,913 |
Weighted-average number of shares outstanding |  |  | 23,082 |  |  |  | 22,901 |
Add weighted-average net shares from assumed exercise of options (under treasury stock method) (1) |  |  | 119 |  |  |  | 183 |
Add weighted-average net shares related to unvested stock awards (under treasury stock method) |  |  | 2 |  |  |  | 8 |
Add weighted-average net shares from assumed exercise of SARs (under treasury stock method) (1) |  |  | 122 |  |  |  | 142 |
Add weighted-average contingently issuable net shares related to performance stock awards (under treasury stock method) |  |  | 64 |  |  |  | 97 |
Weighted-average shares applicable to diluted earnings |  |  | 23,389 |  |  |  | 23,331 |
Diluted earnings per share |  | $ | 1.31 |  |  | $ | 1.37 |
(1) Options/SARs to acquire 2,807 and 74,521 shares of Company common stock were excluded from the computations of diluted earnings per share for the three months ended March 31, 2018 and March 31, 2017, because the effect of including the instruments 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://www.xbrl.org/2003/role/presentationRef -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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