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Stock-Based Compensation - Compensation Expense Recorded for All Stock Options, Stock Awards and SARs (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2017 | Mar. 31, 2016
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |  |
Compensation expense | $ 1,385 | $ 2,423

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- Definition Allocated share based compensation expense (income). + References No definition available. + Details
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Namespace Prefix: | scl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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