Condensed Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Income Statement [Abstract]
Net Sales	$ 590,284	$ 546,842	$ 1,778,228	$ 1,654,665
Cost of Sales	519,261	471,157	1,559,857	1,439,147
Gross Profit	71,023	75,685	218,371	215,518
Operating Expenses:
Selling	11,299	11,394	38,064	34,610
Administrative	22,864	26,254	67,079	73,513
Research, development and technical services	14,225	13,532	43,575	41,881
Deferred compensation expense	841	556	1,606	2,729
Total Operating expenses	49,229	51,736	150,324	152,733
Operating Income	21,794	23,949	68,047	62,785
Other Income (Expense):
Interest, net	(6,815)	(3,621)	(16,426)	(9,353)
Other, net (Note 15)	1,536	989	3,344	4,551
Nonoperating Income (Expense), Total	(5,279)	(2,632)	(13,082)	(4,802)
Income Before Provision for Income Taxes	16,515	21,317	54,965	57,983
Provision for Income Taxes	5,676	(2,289)	13,074	10,963
Net Income	$ 10,839	$ 23,606	$ 41,891	$ 47,020
Net Income Per Common Share (Note 10):
Basic	$ 0.47	$ 1.03	$ 1.83	$ 2.06
Diluted	$ 0.47	$ 1.03	$ 1.83	$ 2.05
Shares Used to Compute Net Income Per Common Share (Note 10):
Basic	22,875	22,836	22,869	22,829
Diluted	22,893	22,923	22,888	22,936

Deferred compensation expense (income).

No definition available.

Name:	scl_DeferredCompensationExpenseIncome
Namespace Prefix:	scl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use; or 3) to perform technical services which include routine product testing, quality control and sales support service.

+ References

No definition available.