Recent Accounting Pronouncements - Additional Information (Detail) $ in Thousands	Jan. 01, 2019 USD ($)
Accounting Changes And Error Corrections [Abstract]
Reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from Tax Act	$ 5,325

Amount of increase (decrease) in accumulated other comprehensive income (AOCI) for reclassification to retained earnings of tax effect from remeasurement of deferred tax pursuant to Tax Cuts and Jobs Act.

No definition available.

Name:	scl_TaxCutsAndJobsAct2017ReclassificationFromAOCIToRetainedEarningsTaxEffect
Namespace Prefix:	scl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration