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Leases - Additional Information (Detail) - Equipment and Railcars [Member] - USD ($)	Mar. 31, 2024	Dec. 31, 2023	Sep. 30, 2023
Lessee, Lease, Description [Line Items]
Leases not yet commenced			$ 5,959,000
Forecast [Member] | Maximum [Member]
Lessee, Lease, Description [Line Items]
Lessee, operating lease, term of contract	7 years	7 years
Forecast [Member] | Minimum [Member]
Lessee, Lease, Description [Line Items]
Lessee, operating lease, term of contract	1 year	1 year

X

- Definition

Operating lease liability not yet commenced value.

+ References

No definition available.

+ Details

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Namespace Prefix:	scl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- 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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147478964/842-20-50-3

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147478964/842-20-50-3

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	instant

X

- Details

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Namespace Prefix:
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Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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X

- Details

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