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Debt - Schedule of Net Interest Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Interest Income Expense Net [Abstract]
Interest expense	$ 9,859	$ 12,744	$ 13,360
Interest income	(2,171)	(5,717)	(1,829)
Interest expense net of interest income	7,688	7,027	11,531
Capitalized interest	(2,279)	(1,095)	(760)
Interest expense, net	$ 5,409	$ 5,932	$ 10,771

X

- Definition

Interest expense net of interest income.

+ References

No definition available.

+ Details

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Namespace Prefix:	scl_
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Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of interest costs capitalized disclosed as an adjusting item to interest costs incurred.

+ References

No definition available.

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X

- Definition

Amount of the cost of borrowed funds accounted for as interest expense for debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 6
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6036836-161870

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.8)
-URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227

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- References

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- Definition

The net amount of nonoperating interest income (expense).

+ References

No definition available.

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- Definition

Amount of interest income earned from interest bearing assets classified as other.

+ References

No definition available.

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