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Earnings Per Share - Computations of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Computation of Basic Earnings per Share |  |  |
Net income attributable to Stepan Company |  | $ 27,545 | $ 24,984
Weighted-average number of common shares outstanding |  | 23,023 | 23,099
Basic earnings per share |  | $ 1.20 | $ 1.08
Computation of Diluted Earnings per Share |  |  |
Net income attributable to Stepan Company |  | $ 27,545 | $ 24,984
Weighted-average number of common shares outstanding |  | 23,023 | 23,099
Add weighted-average net shares related to unvested stock awards (under treasury stock method) |  | 1 | 3
Weighted-average shares applicable to diluted earnings |  | 23,285 | 23,332
Diluted earnings per share |  | $ 1.18 | $ 1.07
Stock Option [Member] |  |  |
Computation of Diluted Earnings per Share |  |  |
Add weighted-average net shares from assumed exercise of options (under treasury stock method) | [1] | 102 | 92
Stock Appreciation Rights (SARs) [Member] |  |  |
Computation of Diluted Earnings per Share |  |  |
Add weighted-average net shares from assumed exercise of options (under treasury stock method) | [1] | 128 | 108
Performance Stock Award [Member] |  |  |
Computation of Diluted Earnings per Share |  |  |
Add weighted-average net shares from assumed exercise of options (under treasury stock method) |  | 31 | 30
[1] | Options/SARs to acquire 256,288 and 214,241 shares of Company common stock were excluded from the computations of diluted earnings per share for the three months ended March 31, 2020 and March 31, 2019. Inclusion of the instruments would have had an antidilutive effect on the earnings per share computations.

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- Definition The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -URI http://asc.fasb.org/extlink&oid=116637232&loc=SL114874131-224263 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=117326831&loc=d3e1337-109256 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=117327953&loc=d3e4984-109258 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22694-107794 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=117326831&loc=d3e1252-109256 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -URI http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 60B -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=117326831&loc=SL5780133-109256 + Details
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