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Line of Credit (Details) (USD $)
In Millions, unless otherwise specified
0 Months Ended
Dec. 14, 2014
Dec. 19, 2014
Debt Instrument [Line Items]    
Debt Intrument, Collateral, Percent of non US equity 65.00%sup_DebtIntrumentCollateralPercentofnonUSequity  
Revolving Credit Facility [Member] | Line of Credit [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Description of Variable Rate Basis JPMCB’s prime rate  
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage 0.20%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
 
Revolving Credit Facility [Member] | Line of Credit [Member] | London Interbank Offered Rate (LIBOR) [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Description of Variable Rate Basis London interbank  
J.P. Morgan Chase Bank N.A. and Wells Fargo Bank N.A. [Member] | Revolving Credit Facility [Member] | Line of Credit [Member]    
Debt Instrument [Line Items]    
Line of Credit, Accordian Feature, Increase Limit   $ 50.0sup_LineofCreditAccordianFeatureIncreaseLimit
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_LineOfCreditFacilityAxis
= sup_J.P.MorganChaseBankN.A.andWellsFargoBankN.A.Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
Line of Credit Facility, Maximum Borrowing Capacity   $ 100.0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_LineOfCreditFacilityAxis
= sup_J.P.MorganChaseBankN.A.andWellsFargoBankN.A.Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
Minimum [Member] | Revolving Credit Facility [Member] | Line of Credit [Member] | London Interbank Offered Rate (LIBOR) [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Basis Spread on Variable Rate 0.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
 
Minimum [Member] | Revolving Credit Facility [Member] | Line of Credit [Member] | Base Rate [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Basis Spread on Variable Rate 0.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_VariableRateAxis
= us-gaap_BaseRateMember
 
Maximum [Member] | Revolving Credit Facility [Member] | Line of Credit [Member] | London Interbank Offered Rate (LIBOR) [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Basis Spread on Variable Rate 1.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
 
Maximum [Member] | Revolving Credit Facility [Member] | Line of Credit [Member] | Base Rate [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Basis Spread on Variable Rate 0.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_VariableRateAxis
= us-gaap_BaseRateMember