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LONG-TERM DEBT (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
LONG-TERM DEBT [Abstract]    
Recovery zone facility bond, maturity date Oct. 01, 2018  
Capital equipment lease maturity date Oct. 01, 2018  
Additional amount to be paid over principal and interest to acquire ownership $ 1syx_AdditionalAmountToBePaidOverPrincipalAndInterestToAcquireOwnership  
Capitalized equipment lease obligation [Abstract]    
Capitalized lease obligations 3,600,000us-gaap_CapitalLeaseObligations 5,400,000us-gaap_CapitalLeaseObligations
Less: current portion 2,700,000us-gaap_CapitalLeaseObligationsCurrent 2,500,000us-gaap_CapitalLeaseObligationsCurrent
Long term debt 900,000us-gaap_LongTermDebtNoncurrent 2,900,000us-gaap_LongTermDebtNoncurrent
Maturities of long-term debt outstanding [Abstract]    
2015 2,700,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths  
2016 600,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo  
2017 300,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree  
2018 0us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour  
2019 0us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive  
Warehouse Capitalized Equipment Lease [Member]    
Capitalized equipment lease obligation [Abstract]    
Capitalized lease obligations 2,200,000us-gaap_CapitalLeaseObligations
/ us-gaap_DebtInstrumentAxis
= syx_WarehouseCapitalizedEquipmentLeaseMember
4,100,000us-gaap_CapitalLeaseObligations
/ us-gaap_DebtInstrumentAxis
= syx_WarehouseCapitalizedEquipmentLeaseMember
Other Capitalized Equipment Lease [Member]    
Capitalized equipment lease obligation [Abstract]    
Capitalized lease obligations $ 1,400,000us-gaap_CapitalLeaseObligations
/ us-gaap_DebtInstrumentAxis
= syx_OtherCapitalizedEquipmentLeaseMember
$ 1,300,000us-gaap_CapitalLeaseObligations
/ us-gaap_DebtInstrumentAxis
= syx_OtherCapitalizedEquipmentLeaseMember