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Sale of Assets - Additional Information (Detail) - Operating Segments [Member] - Surfactants [Member] - Stepan Philippines Quaternaries, Inc.[Member]	May 27, 2025 USD ($)
Business Combination [Line Items]
Assets held for sale	$ 8,476,000
Liabilities held for sale	4,571,000
Liabilities held for sale operating lease liabilities	4,571,000
Assets held for sale property, plant and equipment net	3,796,000
Assets held for sale operating lease right-of use assets	$ 4,680,000

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