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Pay vs Performance Disclosure - USD ($) | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Pay vs Performance Disclosure |  |  |  |
Pay vs Performance Disclosure, Table | Pay Versus Performance Table As required by Item 402(v) of Regulation S-K, we are providing the following information about the relationship between compensation actually paid (“CAP”), as defined in Item 402(v), and performance.
Year |  | Summary Compensation Table Total for First Principal Executive Officer (PEO) (1) |  |  | Compensation Actually Paid to First PEO (2)(3) |  |  | Summary Compensation Table Total for Second (PEO) (1) |  |  | Compensation Actually Paid to Second PEO (2)(3) |  |  | Average Summary Compensation Table Total for Non-PEO Named Executive Officers (NEOs) (1) |  |  | Average Compensation Actually Paid to Non-PEO NEOs (2)(3) |  |  | Value of Initial Fixed $100 Investment Based On: |  |  | Net Income (millions) (5) |  |  | Adjusted Net Income (millions) (6) |
| Total Shareholder Return |  |  | Peer Group Total Shareholder Return (4) |
2023 |  | $ | 4,123,893 |  |  | $ | 1,047,254 |  |  |  | — |  |  |  | — |  |  | $ | 1,166,988 |  |  | $ | 486,718 |  |  | $ | 97 |  |  | $ | 143 |  |  | $ | 40.2 |  |  | $ | 50.7 |
2022 |  | $ | 4,959,346 |  |  | $ | 5,118,772 |  |  | $ | 4,745,670 |  |  | $ | 243,286 |  |  | $ | 1,622,615 |  |  | $ | 1,470,109 |  |  | $ | 108 |  |  | $ | 130 |  |  | $ | 147.2 |  |  | $ | 153.5 |
2021 |  |  | — |  |  |  | — |  |  | $ | 5,380,963 |  |  | $ | 5,838,352 |  |  | $ | 1,556,535 |  |  | $ | 1,666,269 |  |  | $ | 124 |  |  | $ | 116 |  |  | $ | 137.8 |  |  | $ | 143.5 |
2020 |  |  | — |  |  |  | — |  |  | $ | 6,330,645 |  |  | $ | 8,750,899 |  |  | $ | 1,705,840 |  |  | $ | 2,223,882 |  |  | $ | 118 |  |  | $ | 116 |  |  | $ | 126.8 |  |  | $ | 132.0 |
(1) | For 2022 and 2023, the first PEO listed is Scott R. Behrens, who became President and Chief Executive Officer on April 25, 2022, and the second PEO listed is F. Quinn Stepan, Jr., who served as President and Chief Executive Officer until April 25, 2022. For 2020 and 2021, F. Quinn Stepan Jr. was the PEO but is designated second PEO in the chart for those years. Our other NEOs for the covered years were as follows:
2020 |  | 2021 |  | 2022 |  | 2023
Luis E. Rojo |  | Luis E. Rojo |  | Luis E. Rojo |  | Luis E. Rojo
Arthur W. Mergner |  | Arthur W. Mergner |  | Arthur W. Mergner |  | Arthur W. Mergner
David G. Kabbes |  | Sean T. Moriarty |  | David G. Kabbes |  | David G. Kabbes
Scott R. Behrens |  | Scott R. Behrens |  | Sean T. Moriarty |  | Sean T. Moriarty
|  |  |  |  |  | Robert J. Haire, Jr.
(2) | The following adjustments relating to equity awards were made to total compensation to determine CAP for 2023:
Year |  | Value of Equity Awards Disclosed in the Summary Compensation Table (Stock Awards and Option Awards Columns) |  |  | Year End Value of Equity Awards Granted During the Covered Year |  |  | Change in Fair Value of Outstanding and Unvested Equity Awards as of Covered Year-End |  |  | Fair Value of Awards Granted and Vesting in the Covered Year |  |  | Value of Awards Granted in Prior Years Vesting During the Covered Year |  |  | Value of Awards Granted in Prior Years that Fail to Meet Applicable Vesting Conditions During the Covered Year |  |  | Total Equity Award Adjustments |
2023 First PEO |  | -$ | 3,055,835 |  |  | $ | 1,179,324 |  |  | -$ | 835,066 |  |  | $ | 0 |  |  | -$ | 347,271 |  |  | $ | 0 |  |  | -$ | 3,058,848 |
2023 Average Non-PEO NEO |  | -$ | 670,569 |  |  | $ | 298,733 |  |  | -$ | 102,574 |  |  | $ | 5,980 |  |  | -$ | 90,433 |  |  | -$ | 111,389 |  |  | -$ | 670,253 |
| The valuation methodologies used to calculate fair values for each measurement date do not materially differ from those used at the time of grant of each respective award.
(3) | The following adjustments relating to the Company’s frozen defined benefit and pension plans (as applicable) were made to total compensation for each year to determine CAP:
|  | Aggregate Change in Actuarial Present Value of Pension Benefits |  |  |  | Service Cost and Prior Service Cost of Pension Benefits |  |  |  |  | Total Pension Benefit Adjustments |
Year |  | First PEO |  | Non-PEO NEOs |  |  |  | First PEO |  | Non-PEO NEOs |  |  |  |  | First PEO |  |  | Non-PEO NEOs |
2023 |  | -$17,791 |  | -$10,017 |  |  |  | $0 |  | $0 |  |  |  |  |  | -$ | 17,791 |  |  | -$ | 10,017 |
(4) | Represents the cumulative total shareholder return (“TSR”) for the Dow Jones U.S. Chemicals Index.
(5) | The dollar amounts reported represent the amount of net income reflected in the Company’s audited financial statements for the applicable year (GAAP net income).
(6) | Adjusted net income represents the most important financial performance measure used by the Company to link CAP for 2023 to Company performance. 4
Company Selected Measure Name | Adjusted net income |  |  |
Named Executive Officers, Footnote | Our other NEOs for the covered years were as follows:
2020 |  | 2021 |  | 2022 |  | 2023
Luis E. Rojo |  | Luis E. Rojo |  | Luis E. Rojo |  | Luis E. Rojo
Arthur W. Mergner |  | Arthur W. Mergner |  | Arthur W. Mergner |  | Arthur W. Mergner
David G. Kabbes |  | Sean T. Moriarty |  | David G. Kabbes |  | David G. Kabbes
Scott R. Behrens |  | Scott R. Behrens |  | Sean T. Moriarty |  | Sean T. Moriarty
|  |  |  |  |  | Robert J. Haire, Jr.
Peer Group Issuers, Footnote | Represents the cumulative total shareholder return (“TSR”) for the Dow Jones U.S. Chemicals Index. |  |  |
Adjustment To PEO Compensation, Footnote |
(2) | The following adjustments relating to equity awards were made to total compensation to determine CAP for 2023:
Year |  | Value of Equity Awards Disclosed in the Summary Compensation Table (Stock Awards and Option Awards Columns) |  |  | Year End Value of Equity Awards Granted During the Covered Year |  |  | Change in Fair Value of Outstanding and Unvested Equity Awards as of Covered Year-End |  |  | Fair Value of Awards Granted and Vesting in the Covered Year |  |  | Value of Awards Granted in Prior Years Vesting During the Covered Year |  |  | Value of Awards Granted in Prior Years that Fail to Meet Applicable Vesting Conditions During the Covered Year |  |  | Total Equity Award Adjustments |
2023 First PEO |  | -$ | 3,055,835 |  |  | $ | 1,179,324 |  |  | -$ | 835,066 |  |  | $ | 0 |  |  | -$ | 347,271 |  |  | $ | 0 |  |  | -$ | 3,058,848 |
2023 Average Non-PEO NEO |  | -$ | 670,569 |  |  | $ | 298,733 |  |  | -$ | 102,574 |  |  | $ | 5,980 |  |  | -$ | 90,433 |  |  | -$ | 111,389 |  |  | -$ | 670,253 |
| The valuation methodologies used to calculate fair values for each measurement date do not materially differ from those used at the time of grant of each respective award.
Non-PEO NEO Average Total Compensation Amount | $ 1,166,988 | $ 1,622,615 | $ 1,556,535 | $ 1,705,840
Non-PEO NEO Average Compensation Actually Paid Amount | $ 486,718 | 1,470,109 | 1,666,269 | 2,223,882
Adjustment to Non-PEO NEO Compensation Footnote |
(2) | The following adjustments relating to equity awards were made to total compensation to determine CAP for 2023:
Year |  | Value of Equity Awards Disclosed in the Summary Compensation Table (Stock Awards and Option Awards Columns) |  |  | Year End Value of Equity Awards Granted During the Covered Year |  |  | Change in Fair Value of Outstanding and Unvested Equity Awards as of Covered Year-End |  |  | Fair Value of Awards Granted and Vesting in the Covered Year |  |  | Value of Awards Granted in Prior Years Vesting During the Covered Year |  |  | Value of Awards Granted in Prior Years that Fail to Meet Applicable Vesting Conditions During the Covered Year |  |  | Total Equity Award Adjustments |
2023 First PEO |  | -$ | 3,055,835 |  |  | $ | 1,179,324 |  |  | -$ | 835,066 |  |  | $ | 0 |  |  | -$ | 347,271 |  |  | $ | 0 |  |  | -$ | 3,058,848 |
2023 Average Non-PEO NEO |  | -$ | 670,569 |  |  | $ | 298,733 |  |  | -$ | 102,574 |  |  | $ | 5,980 |  |  | -$ | 90,433 |  |  | -$ | 111,389 |  |  | -$ | 670,253 |
| The valuation methodologies used to calculate fair values for each measurement date do not materially differ from those used at the time of grant of each respective award.
Compensation Actually Paid vs. Total Shareholder Return |  |  |  |
Compensation Actually Paid vs. Net Income |  |  |  |
Compensation Actually Paid vs. Company Selected Measure |  |  |  |
Total Shareholder Return Vs Peer Group |  |  |  |
Tabular List, Table | Tabular List of Financial Performance Measures The most important financial performance measures used by the Company to link executive CAP to the Company’s PEOs and NEOs, for the most recently completed fiscal year, to the Company’s performance are as follows: Financial Performance Measures Adjusted net income Return on invested capital Profitability of strategic growth areas Business unit operating income |  |  |
Total Shareholder Return Amount | $ 97 | 108 | 124 | 118
Peer Group Total Shareholder Return Amount | 143 | 130 | 116 | 116
Net Income (Loss) | $ 40,200,000 | $ 147,200,000 | $ 137,800,000 | $ 126,800,000
Company Selected Measure Amount | 50,700,000 | 153,500,000 | 143,500,000 | 132,000,000
PEO Name | Scott R. Behrens | Scott R. Behrens | F. Quinn Stepan, Jr. | F. Quinn Stepan, Jr.
Measure:: 1 |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Name | Adjusted net income |  |  |
Non-GAAP Measure Description | Adjusted net income is a financial measure that has not been calculated pursuant to U.S. GAAP. See Appendix A for further discussion and a reconciliation of this non-GAAP financial measure to net income, the most directly comparable GAAP measure. |  |  |
Measure:: 2 |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Name | Return on invested capital |  |  |
Measure:: 3 |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Name | Profitability of strategic growth areas |  |  |
Measure:: 4 |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Name | Business unit operating income |  |  |
Change In Actuarial Present Value Of Pension Benefits [Member] |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | $ (10,017) |  |  |
Service Cost And Prior Service Cost Of Pension Benefits [Member] |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | 0 |  |  |
Total Pension Benefit Adjustments [Member] |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | (10,017) |  |  |
Scott R. Behrens [Member] |  |  |  |
Pay vs Performance Disclosure |  |  |  |
PEO Total Compensation Amount | 4,123,893 | $ 4,959,346 |  |
PEO Actually Paid Compensation Amount | 1,047,254 | 5,118,772 |  |
Scott R. Behrens [Member] | Change In Actuarial Present Value Of Pension Benefits [Member] |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | (17,791) |  |  |
Scott R. Behrens [Member] | Service Cost And Prior Service Cost Of Pension Benefits [Member] |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | 0 |  |  |
Scott R. Behrens [Member] | Total Pension Benefit Adjustments [Member] |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | (17,791) |  |  |
F. Quinn Stepan [Member] |  |  |  |
Pay vs Performance Disclosure |  |  |  |
PEO Total Compensation Amount |  | 4,745,670 | $ 5,380,963 | $ 6,330,645
PEO Actually Paid Compensation Amount |  | $ 243,286 | $ 5,838,352 | $ 8,750,899
PEO | Scott R. Behrens [Member] | Value Of Equity Awards Disclosed In The Summary Compensation [Member] |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | (3,055,835) |  |  |
PEO | Scott R. Behrens [Member] | Year End Value Of Equity Awards Granted During The Covered Year [Member] |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | 1,179,324 |  |  |
PEO | Scott R. Behrens [Member] | Change In Fair Value Ff Outstanding And unvested Equity Awards As Of Covered Yearend [Member] |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | (835,066) |  |  |
PEO | Scott R. Behrens [Member] | Fair Value Of Awards Granted And Vesting In The Covered Year [Member] |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | 0 |  |  |
PEO | Scott R. Behrens [Member] | Value Of Awards Granted In Prior Years Vesting During The Covered Year [Member] |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | (347,271) |  |  |
PEO | Scott R. Behrens [Member] | Value Of Awards Granted In Prior Years That Fail To Meet Applicable Vesting Conditions During The Covered Year [Member] |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | 0 |  |  |
PEO | Scott R. Behrens [Member] | Total Equity Award Adjustments [Member] |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | (3,058,848) |  |  |
Non-PEO NEO | Value Of Equity Awards Disclosed In The Summary Compensation [Member] |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | (670,569) |  |  |
Non-PEO NEO | Year End Value Of Equity Awards Granted During The Covered Year [Member] |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | 298,733 |  |  |
Non-PEO NEO | Change In Fair Value Ff Outstanding And unvested Equity Awards As Of Covered Yearend [Member] |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | (102,574) |  |  |
Non-PEO NEO | Fair Value Of Awards Granted And Vesting In The Covered Year [Member] |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | 5,980 |  |  |
Non-PEO NEO | Value Of Awards Granted In Prior Years Vesting During The Covered Year [Member] |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | (90,433) |  |  |
Non-PEO NEO | Value Of Awards Granted In Prior Years That Fail To Meet Applicable Vesting Conditions During The Covered Year [Member] |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | (111,389) |  |  |
Non-PEO NEO | Total Equity Award Adjustments [Member] |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | $ (670,253) |  |  |

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