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Contingencies - Additional Information (Detail) (USD $)
3 Months Ended 12 Months Ended
Mar. 31, 2015
States
Mar. 31, 2014
Dec. 31, 2014
Site Contingency [Line Items]      
Environmental and legal losses, minimum $ 22,100,000us-gaap_LossContingencyRangeOfPossibleLossMinimum    
Environmental and legal losses, maximum 41,400,000us-gaap_LossContingencyRangeOfPossibleLossMaximum    
Accrued liability for losses 22,100,000us-gaap_LossContingencyEstimateOfPossibleLoss   22,000,000us-gaap_LossContingencyEstimateOfPossibleLoss
Cash outlays related to legal and environmental matters 300,000us-gaap_PaymentsForLegalSettlements 300,000us-gaap_PaymentsForLegalSettlements  
Number of states examining company unclaimed property records 7scl_NumberOfStatesInAuditingProcess    
Liability for unpaid claim and claim adjustment expense, claims paid 4,016,000us-gaap_PaymentsForLossesAndLossAdjustmentExpense   3,475,000us-gaap_PaymentsForLossesAndLossAdjustmentExpense
VAT inflation, penalty and interest charges 0us-gaap_SalesAndExciseTaxPayableCurrentAndNoncurrent    
Maywood Site [Member]      
Site Contingency [Line Items]      
Accrual for environmental loss contingencies, increase (decrease) for revision in estimates 600,000us-gaap_AccrualForEnvironmentalLossContingenciesIncreaseDecreaseForRevisionInEstimates
/ us-gaap_EnvironmentalRemediationContingencyAxis
= scl_MaywoodSiteMember
   
Wilmington Site [Member]      
Site Contingency [Line Items]      
Contribution for future response costs 5.00%scl_SiteContingencyMaximumFutureResponseCostPercentage
/ us-gaap_EnvironmentalRemediationContingencyAxis
= scl_WilmingtonSiteMember
   
Payment of environmental response costs $ 2,300,000scl_PaymentsForSiteContingencies
/ us-gaap_EnvironmentalRemediationContingencyAxis
= scl_WilmingtonSiteMember