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Postretirement Benefit Plans - Defined Contribution Plans - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Defined Contribution Plan Disclosure [Line Items] |  |  |
Supplemental plan liability balances | $ 446,000 | $ 2,221,000 |
Defined contribution plan expense | $ 13,832 | 13,215 | $ 14,142
Percentage of union and non-union employees eligible for either statutory or Company's sponsored profit sharing contributions | 85.00% |  |
Percentage of us based union and non-union employees eligible for either statutory or Company's sponsored profit sharing contributions | 100.00% |  |
Statutory Plans [Member] |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Defined contribution plan expense | $ 421,000 | 219,000 | $ 1,679,000
Defined Contribution Plans [Member] |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Balance of trust assets | $ 376,000 | $ 2,146,000 |

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- Definition Balance of the trust assets. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Percentage of US based union and non union employees eligible for either Statutory or companys sponsored profit sharing contributions. + References No definition available. + Details
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Data Type: | dtr-types:percentItemType
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Period Type: | duration

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- Definition Percentage of union and non-union employees eligible for either statutory or Company's sponsored profit sharing contributions. + References No definition available. + Details
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Namespace Prefix: | scl_
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- Definition Supplemental executive retirement plan liability. + References No definition available. + Details
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Namespace Prefix: | scl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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- 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
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Data Type: | na
Balance Type: |
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