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Postretirement Benefit Plans - Estimated Amounts Reclassified from Accumulated Other Comprehensive Income into Net Periodic Benefit Cost (Detail) $ in Thousands | Dec. 31, 2018 USD ($)
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United States [Member] |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |
Net actuarial loss | $ 2,609
United Kingdom [Member] |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |
Net actuarial loss | $ 244

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- Definition Pension plans postretirement and other employee benefits. + References No definition available. + Details
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Namespace Prefix: | scl_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of cost (credit) included in accumulated other comprehensive (income) loss expected to be recognized in net periodic benefit cost (credit) for fiscal year following most recent annual statement of financial position. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (s) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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Balance Type: | debit
Period Type: | instant

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- Details
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Period Type: |

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- Details
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Balance Type: |
Period Type: |