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Debt - Schedule of Net Interest Expense (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Interest Income Expense Net [Abstract] |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  | $ 15,240 | $ 15,488 | $ 12,542
Interest income |  |  |  |  |  |  |  |  | (1,247) | (217) | (262)
Interest expense net of interest income |  |  |  |  |  |  |  |  | 13,993 | 15,271 | 12,280
Capitalized interest |  |  |  |  |  |  |  |  | (788) | (738) | (839)
Interest expense, net | $ 3,350 | $ 2,824 | $ 3,417 | $ 3,614 | $ 3,773 | $ 3,837 | $ 2,869 | $ 4,054 | $ 13,205 | $ 14,533 | $ 11,441

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
Name: | us-gaap_InterestIncomeExpenseNonoperatingNet
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