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Debt - Schedule of Net Interest Expense (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Interest Income Expense Net [Abstract] |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  | $ 14,428 | $ 15,240 | $ 15,488
Interest income |  |  |  |  |  |  |  |  | (2,075) | (1,247) | (217)
Interest expense net of interest income |  |  |  |  |  |  |  |  | 12,353 | 13,993 | 15,271
Capitalized interest |  |  |  |  |  |  |  |  | (909) | (788) | (738)
Interest expense, net | $ 2,826 | $ 2,763 | $ 2,863 | $ 2,992 | $ 3,350 | $ 2,824 | $ 3,417 | $ 3,614 | $ 11,444 | $ 13,205 | $ 14,533

X
- Definition Amount of the cost of borrowed funds accounted for as interest expense and amount of finance charges incurred for other transactions. + References No definition available. + Details
Name: | scl_InterestExpenseGross
Namespace Prefix: | scl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Interest expense net of interest income. + References No definition available. + Details
Name: | scl_InterestExpenseNetOfInterestIncome
Namespace Prefix: | scl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of interest costs capitalized disclosed as an adjusting item to interest costs incurred. + References No definition available. + Details
Name: | us-gaap_InterestCostsCapitalizedAdjustment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_InterestIncomeExpenseNetAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The net amount of nonoperating interest income (expense). + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of interest income earned from interest bearing assets classified as other. + References No definition available. + Details
Name: | us-gaap_InterestIncomeOther
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration