Postretirement Benefit Plans - Defined Benefit Pension Plans - Additional Information (Detail) (Defined Benefit Pension Plan [Member], USD $)	3 Months Ended
Mar. 31, 2015
U.S Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Company's expected contribution to qualified plan	$ 0
Expected payment related to unqualified plan	185,000
Payments related to non-qualified plans	141,000
U.K Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Company's expected contribution to qualified plan	551,000
Employer contributions	$ 216,000

Expected current year payments to be made out of an entity's cash to participants of an unfunded nonqualified pension plan.

No definition available.

+ Details

Name:	scl_ExpectedPaymentRelatedToNonqualifiedPlan
Namespace Prefix:	scl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Current year payments made out of an entity's cash to participants of an unfunded nonqualified pension plan.

+ References

No definition available.

+ Details

Name:	scl_PaymentsRelatedToNonqualifiedPlans
Namespace Prefix:	scl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The increase in the fair value of plan assets from contributions made by the employer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (b)(3)

-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920

+ Details

Name:	us-gaap_DefinedBenefitPlanContributionsByEmployer
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

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

- Definition

Amount of employer's best estimate of contributions expected to be paid to the plan in the current remaining fiscal period.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInCurrentFiscalYear
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration