Derivative Instruments - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative notional amount	$ 57,755,000	$ 149,571,000
Revolving Credit Facility [Member]
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Debt Instrument, Maturity Date	Jun. 24, 2027
Cash Flow Hedging [Member]
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative notional amount	$ 100,000,000
Maturity date of current interest swap contract	Mar. 10, 2027
Minimum [Member]
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative foreign currency exchange contracts durations	1 month
Maximum [Member]
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative foreign currency exchange contracts durations	3 months

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References + Details

STEPAN CO 10-K