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Leases - Additional Information (Detail) $ in Thousands | 3 Months Ended
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Mar. 31, 2020 USD ($) Country
Operating Leased Assets [Line Items] |
Operating lease, liability | $ 36,264
Number of countries leases reside | Country | 5
Percentage of value of leases reside | 97.00%
Minimum [Member] |
Operating Leased Assets [Line Items] |
Lessee, operating lease, term of contract | 1 year
Maximum [Member] |
Operating Leased Assets [Line Items] |
Lessee, operating lease, term of contract | 10 years
Railcars [Member] |
Operating Leased Assets [Line Items] |
Percentage of lease asset categories | 50.00%
Real Estate [Member] |
Operating Leased Assets [Line Items] |
Percentage of lease asset categories | 38.00%
Real Estate [Member] | Minimum [Member] |
Operating Leased Assets [Line Items] |
Lessee, operating lease, term of contract | 1 year
Real Estate [Member] | Maximum [Member] |
Operating Leased Assets [Line Items] |
Lessee, operating lease, term of contract | 50 years
Equipment and Storage Tanks [Member] |
Operating Leased Assets [Line Items] |
Operating lease, liability | $ 731,000
Equipment and Storage Tanks [Member] | Minimum [Member] |
Operating Leased Assets [Line Items] |
Lessee, operating lease, term of contract | 3 years
Equipment and Storage Tanks [Member] | Maximum [Member] |
Operating Leased Assets [Line Items] |
Lessee, operating lease, term of contract | 5 years

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- Definition Number of countries leases reside + References No definition available. + Details
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Balance Type: | na
Period Type: | instant

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- Definition Percentage of lease asset categories + References No definition available. + Details
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Namespace Prefix: | scl_
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Balance Type: | na
Period Type: | duration

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- Definition Percentage of value of leases reside. + References No definition available. + Details
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Namespace Prefix: | scl_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980 + Details
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Balance Type: | na
Period Type: | instant

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- Definition Present value of lessee's discounted obligation for lease payments from operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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- Details
Name: | srt_ProductOrServiceAxis=scl_RailcarsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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