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Debt - Additional Information (Detail) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Jul. 10, 2014
Debt Instrument [Line Items]      
Total debt $ 273,931,000us-gaap_LongTermDebt $ 270,623,000us-gaap_LongTermDebt  
Revolving credit agreement 125,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity    
Letters of Credit Outstanding 2,727,000us-gaap_LettersOfCreditOutstandingAmount    
Debt Outstanding 20,000,000us-gaap_LineOfCredit    
Unused Revolving credit 102,273,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity    
Line of credit facility, Minimum maturity period 1 day    
Line of credit facility, Maximum maturity period 180 days    
Debt matures in 2016 12,723,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo    
Debt matures in 2015 27,034,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths    
Unrestricted retained earnings 88,684,000scl_UnrestrictedRetainedEarnings 148,467,000scl_UnrestrictedRetainedEarnings  
Debt matures in 2017 21,405,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree    
Debt matures in 2018 21,406,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour    
Debt matures in 2019 49,977,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive    
Debt matures after 2019 141,386,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive    
Amount of repayments of long-term debt due in next year 12,808,000scl_AmountOfRepaymentsOfLongTermDebtDueInNextYear    
Amount of repayments of foreign subsidiaries short-term debt due in next year 14,226,000scl_AmountOfRepaymentsOfForeignSubsidiariesShortTermDebtDueInNextYear    
Philippine Subsidiary [Member]      
Debt Instrument [Line Items]      
Spread rate 1.375%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_ShortTermDebtTypeAxis
= scl_PhilippineSubsidiaryDebtMember
   
Short-term Debt 747,000us-gaap_ShortTermBorrowings
/ us-gaap_ShortTermDebtTypeAxis
= scl_PhilippineSubsidiaryDebtMember
   
Multi Currency Revolving Credit Facility [Member]      
Debt Instrument [Line Items]      
Revolving credit agreement     125,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= scl_MultiCurrencyRevolvingCreditFacilityMember
Credit agreement expire period, before amendment Sep. 20, 2017    
Credit agreement expire period, after amendment Jul. 10, 2019    
Minimum [Member]      
Debt Instrument [Line Items]      
Facility fee percentage 0.15%us-gaap_LineOfCreditFacilityCommitmentFeePercentage
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
   
Minimum [Member] | LIBOR [Member]      
Debt Instrument [Line Items]      
Spread rate 0.975%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
   
Minimum [Member] | Prime Rate [Member]      
Debt Instrument [Line Items]      
Spread rate 0.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_VariableRateAxis
= us-gaap_PrimeRateMember
   
Maximum [Member]      
Debt Instrument [Line Items]      
Spread on Prime rate 0.525%scl_DebtInstrumentBasisSpreadOnPrimeVariableRate
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
   
Facility fee percentage 0.35%us-gaap_LineOfCreditFacilityCommitmentFeePercentage
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
   
Maximum [Member] | LIBOR [Member]      
Debt Instrument [Line Items]      
Spread rate 1.525%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
   
Unsecured Private Placement Notes [Member]      
Debt Instrument [Line Items]      
Total debt 232,141,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= scl_UnsecuredPrivatePlacementNotesMember
   
Unsecured Private Placement Notes [Member] | Minimum [Member]      
Debt Instrument [Line Items]      
Debt instrument interest rate percentage 3.86%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= scl_UnsecuredPrivatePlacementNotesMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
   
Maturity Dates 12 years    
Unsecured Private Placement Notes [Member] | Maximum [Member]      
Debt Instrument [Line Items]      
Debt instrument interest rate percentage 6.86%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= scl_UnsecuredPrivatePlacementNotesMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
   
Maturity Dates 13 years    
European Debt [Member]      
Debt Instrument [Line Items]      
Short-term Debt 11,842,000us-gaap_ShortTermBorrowings
/ us-gaap_LongtermDebtTypeAxis
= scl_EuropeanDebtMember
   
European Debt [Member] | Short Term Borrowing Acquired In UK Based Rate [Member]      
Debt Instrument [Line Items]      
Spread rate 2.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_LongtermDebtTypeAxis
= scl_EuropeanDebtMember
/ us-gaap_ShortTermDebtTypeAxis
= scl_ShortTermBorrowingAcquiredInUkBasedRateMember
   
Short term borrowing on UK base rate 1,638,000us-gaap_OtherShortTermBorrowings
/ us-gaap_LongtermDebtTypeAxis
= scl_EuropeanDebtMember
/ us-gaap_ShortTermDebtTypeAxis
= scl_ShortTermBorrowingAcquiredInUkBasedRateMember
   
European Debt [Member] | Bank Term Loan [Member]      
Debt Instrument [Line Items]      
Spread rate 1.30%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= scl_BankTermLoanMember
/ us-gaap_LongtermDebtTypeAxis
= scl_EuropeanDebtMember
   
Short-term Debt 7,563,000us-gaap_ShortTermBorrowings
/ us-gaap_DebtInstrumentAxis
= scl_BankTermLoanMember
/ us-gaap_LongtermDebtTypeAxis
= scl_EuropeanDebtMember
   
Debt matures in 2021 4,840,000scl_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearSeven
/ us-gaap_DebtInstrumentAxis
= scl_BankTermLoanMember
/ us-gaap_LongtermDebtTypeAxis
= scl_EuropeanDebtMember
   
Loan maturity 2021    
European Debt [Member] | Other Term Loan [Member]      
Debt Instrument [Line Items]      
Spread rate 1.08%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= scl_OtherTermLoanMember
/ us-gaap_LongtermDebtTypeAxis
= scl_EuropeanDebtMember
   
Loan maturity 2016    
Fixed interest rate 2.15%us-gaap_ShortTermDebtPercentageBearingFixedInterestRate
/ us-gaap_DebtInstrumentAxis
= scl_OtherTermLoanMember
/ us-gaap_LongtermDebtTypeAxis
= scl_EuropeanDebtMember
   
Debt matures in 2016 1,815,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
/ us-gaap_DebtInstrumentAxis
= scl_OtherTermLoanMember
/ us-gaap_LongtermDebtTypeAxis
= scl_EuropeanDebtMember
   
Debt matures in 2015 $ 908,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths
/ us-gaap_DebtInstrumentAxis
= scl_OtherTermLoanMember
/ us-gaap_LongtermDebtTypeAxis
= scl_EuropeanDebtMember
   
European Debt [Member] | Minimum [Member]      
Debt Instrument [Line Items]      
Spread rate 0.30%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_LongtermDebtTypeAxis
= scl_EuropeanDebtMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
   
European Debt [Member] | Maximum [Member]      
Debt Instrument [Line Items]      
Spread rate 0.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_LongtermDebtTypeAxis
= scl_EuropeanDebtMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember