XML 122 R101.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Postretirement Benefit Plans - Defined Contribution Plan Expenses for the Company's Retirement Savings Plans and Profit Sharing Plan (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Defined Contribution Plan Disclosure [Line Items] |  |  |
Total defined contribution expense | $ 12,000 | $ 11,132 | $ 9,616
Retirement Contributions [Member] |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Total defined contribution expense | 4,998 | 4,902 | 4,644
Profit Sharing Contributions [Member] |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Total defined contribution expense | $ 7,002 | $ 6,230 | $ 4,972

X
- Definition Amount of cost for defined contribution plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
Name: | us-gaap_DefinedContributionPlanCostRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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_RetirementPlanTypeAxis=scl_RetirementContributionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RetirementPlanTypeAxis=scl_ProfitSharingContributionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |