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Postretirement Benefit Plans - Defined Contribution Plans - Additional Information (Detail)	Jun. 30, 2015 USD ($)
Defined Benefit Pension Plan [Member]
Defined Contribution Plan Disclosure [Line Items]
Balance of trust assets	$ 1,827,000

X

- Definition

The period-end balance of the rabbi trust that funds the supplemental executive defined contribution plans.

+ References

No definition available.

+ Details

Name:	scl_BalanceOfTrustAssets
Namespace Prefix:	scl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_DefinedContributionPlanTypeAxis=us-gaap_PensionPlansDefinedBenefitMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: