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CREDIT FACILITIES (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Line of Credit Facility [Line Items] |  |  |
Weighted average interest rate on short-term borrowings | 4.30%us-gaap_ShortTermDebtWeightedAverageInterestRate | 4.30%us-gaap_ShortTermDebtWeightedAverageInterestRate | 4.30%us-gaap_ShortTermDebtWeightedAverageInterestRate
Revolving Credit [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Secured revolving credit agreement, maximum borrowing capacity | $ 125.0 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember |  |
Line of credit facility optional maximum borrowing capacity subject to conditions | 200.0 syx_LineOfCreditFacilityOptionalMaximumBorrowingCapacitySubjectToConditions / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember |  |
Term of credit facility | 5 years |  |
Credit facility, maturing date | Oct. 26, 2015 |  |
Percentage of eligible accounts receivable for borrowings, maximum (in hundredths) | 85.00%syx_PercentageOfEligibleAccountsReceivableForBorrowingsMaximum / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember |  |
Percentage of qualified inventories for borrowings, maximum (in hundredths) | 40.00%syx_PercentageOfQualifiedInventoriesForBorrowingsMaximum / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember |  |
Variable rate basis | LIBOR or the Prime Rate |  |
Eligible collateral letters of credit | 121.9 syx_EligibleCollateralLettersOfCredit / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember |  |
Availability under line of credit | 116.4 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember |  |
Total outstanding letters of credit | $ 5.5 us-gaap_LettersOfCreditOutstandingAmount / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember |  |

X
- Definition Refers to the amount of eligible collateral letters of credit, based on borrowing base availability. + References No definition available. + Details
Name: | syx_EligibleCollateralLettersOfCredit
Namespace Prefix: | syx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The optional maximum borrowing capacity subject to conditions under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References No definition available. + Details
Name: | syx_LineOfCreditFacilityOptionalMaximumBorrowingCapacitySubjectToConditions
Namespace Prefix: | syx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Refers to the maximum percentage of eligible accounts receivable for borrowings under the agreement. + References No definition available. + Details
Name: | syx_PercentageOfEligibleAccountsReceivableForBorrowingsMaximum
Namespace Prefix: | syx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Refers to the maximum percentage of qualified inventories for borrowings under the agreement. + References No definition available. + Details
Name: | syx_PercentageOfQualifiedInventoriesForBorrowingsMaximum
Namespace Prefix: | syx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentDescriptionOfVariableRateBasis
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentTerm
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Date the credit facility terminates, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
Name: | us-gaap_LineOfCreditFacilityExpirationDate1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_LineOfCreditFacilityLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
Name: | us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
Name: | us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Weighted average interest rate of short-term debt outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Subparagraph b -Article 5 + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |