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Stock-Based Compensation - Unrecognized Compensation Costs for Stock Options, Stock Awards and SARs (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Stock Option [Member]    
Unrecognized compensation costs for stock options, stock awards and SARs    
Unrecognized compensation costs for stock options, stock awards and SARs $ 1,668us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 $ 774us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
Stock Awards [Member]    
Unrecognized compensation costs for stock options, stock awards and SARs    
Unrecognized compensation costs for stock options, stock awards and SARs 3,728us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= scl_StockAwardsMember		 1,365us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= scl_StockAwardsMember
Stock Appreciation Rights (SARs) [Member]    
Unrecognized compensation costs for stock options, stock awards and SARs    
Unrecognized compensation costs for stock options, stock awards and SARs $ 3,015us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember		 $ 693us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember