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Stock-Based Compensation - Share Based Payment Awards Granted in Period (Detail)
 3 Months Ended
Mar. 31, 2015
Stock Option [Member]  
Awards granted in period  
Stock options granted in period 82,969us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
Stock Awards [Member]  
Awards granted in period  
Awards granted in period 73,028us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= scl_StockAwardsMember
Stock Appreciation Rights (SARs) [Member]  
Awards granted in period  
Awards granted in period 182,417us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember