Number of countries leases reside

No definition available.

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- Definition

Percentage of lease asset categories

+ References

No definition available.

+ Details

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- Definition

Percentage of value of leases property.

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- 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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980

+ Details

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Balance Type:	na
Period Type:	instant

- Definition

Present value of lessee's discounted obligation for lease payments from operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- 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

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

- Details

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- Details

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- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ProductOrServiceAxis=us-gaap_RealEstateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ProductOrServiceAxis=scl_StorageTankMember
Namespace Prefix:
Data Type:	na
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- Details

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Leases - Additional Information (Detail) $ in Thousands	6 Months Ended
Leases - Additional Information (Detail) $ in Thousands	Jun. 30, 2020 USD ($) Country	Sep. 30, 2020
Operating Leased Assets [Line Items]
Operating lease, liability	$ 36,689
Number of countries leases reside \| Country	5
Percentage of value of leases property	98.00%
Minimum [Member]
Operating Leased Assets [Line Items]
Lessee, operating lease, term of contract	1 year
Maximum [Member]
Operating Leased Assets [Line Items]
Lessee, operating lease, term of contract	10 years
Railcars [Member]
Operating Leased Assets [Line Items]
Percentage of lease asset categories	46.00%
Real Estate [Member]
Operating Leased Assets [Line Items]
Percentage of lease asset categories	37.00%
Real Estate [Member] \| Minimum [Member]
Operating Leased Assets [Line Items]
Lessee, operating lease, term of contract	1 year
Real Estate [Member] \| Maximum [Member]
Operating Leased Assets [Line Items]
Lessee, operating lease, term of contract	50 years
Storage Tank [Member]
Operating Leased Assets [Line Items]
Operating lease, liability	$ 612,000
Storage Tank [Member] \| Scenario Forecast [Member]
Operating Leased Assets [Line Items]
Lessee, operating lease, term of contract		4 years