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Acquisitions - Additional Information (Detail) |  |  |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | --- | ---
Feb. 02, 2021 USD ($) | Jan. 29, 2021 USD ($) Site | Sep. 17, 2020 USD ($) | Mar. 13, 2020 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |
Payment of working capital |  | $ 21,560,000 |  |  |  |  |
Payment of value added tax |  | 3,000,000 |  |  |  |  |
Cash acquired on working capital |  | $ 5,900,000 |  |  |  |  |
Purchase price |  |  |  |  |  | $ 3,503,000 | $ 2,040,000
INVISTA Aromatic Polyester Polyol Business Acquisition [Member] | 2021 Acquisitions [Member] | Acquisition-related Costs [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Net income attributable to Stepan Company |  |  |  |  |  | 2,078,000 |
INVISTA Aromatic Polyester Polyol Business Acquisition [Member] | Polymers [Member] | 2021 Acquisitions [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Asset purchase agreement date |  | Jan. 29, 2021 |  |  |  |  |
Number of manufacturing site | Site |  | 2 |  |  |  |  |
Purchase price |  | $ 165,000,000 |  |  |  |  |
Acquisition-related expenses |  |  |  |  | $ 474,000 | 2,078,000 |
INVISTA Aromatic Polyester Polyol Business Acquisition [Member] | Polymers [Member] | 2021 Acquisitions [Member] | Legal, Consulting, Valuation and Accounting Services [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Acquisition-related expenses |  |  |  |  |  | 4,025,000 |
INVISTA Aromatic Polyester Polyol Business Acquisition [Member] | Polymers [Member] | 2021 Acquisitions [Member] | Technology and Manufacturing Know-how [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Identifiable intangible assets |  | 13,000,000 |  |  |  |  |
INVISTA Aromatic Polyester Polyol Business Acquisition [Member] | Polymers [Member] | 2021 Acquisitions [Member] | Trademarks [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Identifiable intangible assets |  | 8,000,000 |  |  |  |  |
INVISTA Aromatic Polyester Polyol Business Acquisition [Member] | Polymers [Member] | 2021 Acquisitions [Member] | Customer Relationships [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Identifiable intangible assets |  | $ 25,000,000 |  |  |  |  |
INVISTA Aromatic Polyester Polyol Business Acquisition [Member] | Polymers [Member] | 2021 Acquisitions [Member] | Customer Relationships [Member] | Minimum [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Weighted average amortization periods of identifiable intangibles assets |  | 12 years |  |  |  |  |
INVISTA Aromatic Polyester Polyol Business Acquisition [Member] | Polymers [Member] | 2021 Acquisitions [Member] | Customer Relationships [Member] | Maximum [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Weighted average amortization periods of identifiable intangibles assets |  | 14 years |  |  |  |  |
INVISTA Aromatic Polyester Polyol Business Acquisition [Member] | Polymers [Member] | 2021 Acquisitions [Member] | Know-how and Trademarks [Member] | Minimum [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Weighted average amortization periods of identifiable intangibles assets |  | 7 years |  |  |  |  |
INVISTA Aromatic Polyester Polyol Business Acquisition [Member] | Polymers [Member] | 2021 Acquisitions [Member] | Know-how and Trademarks [Member] | Maximum [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Weighted average amortization periods of identifiable intangibles assets |  | 8 years |  |  |  |  |
Fermentation Plant Acquisition [Member] | 2021 Acquisitions [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Purchase price | $ 3,500,000 |  |  |  |  |  |
Clariant (Mexico) [Member] | Surfactants [Member] | 2020 Acquisitions [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Purchase price |  |  |  |  |  | 14,308,000 |
Payment of value added tax |  |  |  |  | $ 308,000 | $ 308,000 |
Purchase price |  |  | $ 14,000,000 |  |  |  |
Clariant (Mexico) [Member] | Surfactants [Member] | 2020 Acquisitions [Member] | Trademarks and Know-how [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Identifiable intangible assets |  |  | $ 1,300,000 |  |  |  |
Logos Technologies Asset Acquisition [Member] | Surfactants [Member] | 2020 Acquisitions [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Purchase price |  |  |  | $ 2,040,000 |  |  |
Logos Technologies Asset Acquisition [Member] | Surfactants [Member] | 2020 Acquisitions [Member] | Laboratory Equipment [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Equipment acquired |  |  |  | 184,000 |  |  |
Logos Technologies Asset Acquisition [Member] | Surfactants [Member] | 2020 Acquisitions [Member] | Trademarks and Know-how [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Intangible assets acquired |  |  |  | 1,392,000 |  |  |
Logos Technologies Asset Acquisition [Member] | Surfactants [Member] | 2020 Acquisitions [Member] | Patents [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Intangible assets acquired |  |  |  | $ 464,000 |  |  |

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