Condensed Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Income Statement [Abstract]
Net Sales	$ 684,109	$ 594,689	$ 1,288,618	$ 1,187,944
Cost of Sales	584,127	522,804	1,123,785	1,040,596
Gross Profit	99,982	71,885	164,833	147,348
Operating Expenses:
Selling	14,866	14,657	27,032	26,765
Administrative	24,203	22,801	45,516	44,215
Research, development and technical services	17,195	14,701	32,188	29,350
Deferred compensation expense	1,402	1,761	1,964	765
Total Operating expenses	57,666	53,920	106,700	101,095
Business restructuring (Note 16)	5,106		70,545
Operating Income (Loss)	37,210	17,965	(12,412)	46,253
Other Income (Expense):
Interest, net	(5,682)	(5,485)	(10,693)	(9,611)
Other, net (Note 15)	1,021	1,306	1,165	1,808
Nonoperating Income (Expense), Total	(4,661)	(4,179)	(9,528)	(7,803)
Income (Loss) Before Provision for Income Taxes	32,549	13,786	(21,940)	38,450
Provision for Income Taxes	9,638	2,445	(3,445)	7,398
Net Income (Loss)	$ 22,911	$ 11,341	$ (18,495)	$ 31,052
Net Income (Loss) Per Common Share (Note 10):
Basic	$ 1	$ 0.5	$ (0.81)	$ 1.36
Diluted	$ 1	$ 0.5	$ (0.81)	$ 1.36
Shares Used to Compute Net Income Per Common Share (Note 10):
Basic	22,897	22,865	22,893	22,866
Diluted	22,924	22,879	22,893	22,885

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.