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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 | 9 Months Ended
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Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Computation of Basic Earnings per Share |  |  |  |  |
Net income attributable to Stepan Company | [1] | $ 21,899 | $ 21,362 | $ 81,694 | $ 77,774
Weighted-average number of common shares outstanding |  | 22,971 | 22,819 | 22,941 | 22,771
Basic earnings per share | [1] | $ 0.95 | $ 0.94 | $ 3.56 | $ 3.42
Computation of Diluted Earnings per Share |  |  |  |  |
Net income attributable to Stepan Company |  | $ 21,899 | $ 21,362 | $ 81,694 | $ 77,774
Weighted-average number of common shares outstanding |  | 22,971 | 22,819 | 22,941 | 22,771
Add weighted-average net shares related to unvested stock awards (under treasury stock method) |  | 8 | 7 | 8 | 6
Weighted-average shares applicable to diluted earnings | [1] | 23,374 | 23,148 | 23,361 | 23,017
Diluted earnings per share | [1] | $ 0.94 | $ 0.92 | $ 3.50 | $ 3.38
Options [Member] |  |  |  |  |
Computation of Diluted Earnings per Share |  |  |  |  |
Add weighted-average net shares issuable from assumed exercise of options, SARS and contingently issuable net shares related to performance stock awards (under treasury stock method) | [2] | 147 | 162 | 167 | 151
Stock Appreciation Rights (SARs) [Member] |  |  |  |  |
Computation of Diluted Earnings per Share |  |  |  |  |
Add weighted-average net shares issuable from assumed exercise of options, SARS and contingently issuable net shares related to performance stock awards (under treasury stock method) | [2] | 140 | 93 | 142 | 45
Performance Stock Award [Member] |  |  |  |  |
Computation of Diluted Earnings per Share |  |  |  |  |
Add weighted-average net shares issuable from assumed exercise of options, SARS and contingently issuable net shares related to performance stock awards (under treasury stock method) |  | 108 | 67 | 103 | 44
[1] | The 2016 amounts for the noted items have been immaterially changed from the amounts originally reported as a result of the Company’s fourth quarter 2016 adoption of Accounting Standards Update (ASU) No. 2016-9, Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting.
[2] | Options/SARs to acquire 24,840 shares of Company common stock were excluded from the computations of diluted earnings per share for the nine months ended September 30, 2017. Options/SARs to acquire 58,287 shares of Company common stock were excluded from the computations of diluted earnings per share for the nine months ended September 30, 2016. Inclusion of the instruments would have had antidilutive effects on the computations of earnings per share.

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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/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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=96948231&loc=d3e4984-109258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e1252-109256 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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- Definition The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e1252-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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