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Credit Facilities and Long-Term Debt, Revolving Credit Facility (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014
Line of Credit Facility [Line Items] |  |  |
Maximum borrowing capacity | $ 250 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity |  |
Expiration date | Mar. 31, 2018 |  |
Additional available borrowing capacity | 147.5 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity |  |
Financial covenants | At any time that our average borrowing availability is less than $25 million, the terms of our restated credit agreement provide for, among other provisions, a financial covenant requiring us, on a consolidated basis, to maintain specified levels of fixed charge coverage at the end of each fiscal quarter (rolling twelve months). |  |
General Electric Capital Corporation Credit Facility [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Outstanding borrowings under credit facility | 71.6 us-gaap_DebtInstrumentCarryingAmount / us-gaap_CreditFacilityAxis = smp_GeneralElectricCapitalCorporationCreditFacilityMember |  | 56.6 us-gaap_DebtInstrumentCarryingAmount / us-gaap_CreditFacilityAxis = smp_GeneralElectricCapitalCorporationCreditFacilityMember
Weighted average interest rate (in hundredths) | 2.00%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd / us-gaap_CreditFacilityAxis = smp_GeneralElectricCapitalCorporationCreditFacilityMember |  | 1.80%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd / us-gaap_CreditFacilityAxis = smp_GeneralElectricCapitalCorporationCreditFacilityMember
General Electric Capital Corporation Credit Facility [Member] | Maximum [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Conditions for required financial covenants, maximum borrowing availability | 25 smp_DebtInstrumentConditionsForRequiredFinancialCovenantsBorrowingAvailabilityMaximum / us-gaap_CreditFacilityAxis = smp_GeneralElectricCapitalCorporationCreditFacilityMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
General Electric Capital Corporation Credit Facility [Member] | Direct Borrowings [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Outstanding borrowings under credit facility | 61.0 us-gaap_DebtInstrumentCarryingAmount / us-gaap_CreditFacilityAxis = smp_GeneralElectricCapitalCorporationCreditFacilityMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |  | 53.0 us-gaap_DebtInstrumentCarryingAmount / us-gaap_CreditFacilityAxis = smp_GeneralElectricCapitalCorporationCreditFacilityMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember
Weighted average interest rate (in hundredths) | 1.70%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd / us-gaap_CreditFacilityAxis = smp_GeneralElectricCapitalCorporationCreditFacilityMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |  | 1.70%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd / us-gaap_CreditFacilityAxis = smp_GeneralElectricCapitalCorporationCreditFacilityMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember
General Electric Capital Corporation Credit Facility [Member] | Index Loan [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Outstanding borrowings under credit facility | 10.6 us-gaap_DebtInstrumentCarryingAmount / us-gaap_CreditFacilityAxis = smp_GeneralElectricCapitalCorporationCreditFacilityMember / us-gaap_VariableRateAxis = smp_IndexLoanMember |  | 3.6 us-gaap_DebtInstrumentCarryingAmount / us-gaap_CreditFacilityAxis = smp_GeneralElectricCapitalCorporationCreditFacilityMember / us-gaap_VariableRateAxis = smp_IndexLoanMember
Weighted average interest rate (in hundredths) | 3.80%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd / us-gaap_CreditFacilityAxis = smp_GeneralElectricCapitalCorporationCreditFacilityMember / us-gaap_VariableRateAxis = smp_IndexLoanMember |  | 3.80%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd / us-gaap_CreditFacilityAxis = smp_GeneralElectricCapitalCorporationCreditFacilityMember / us-gaap_VariableRateAxis = smp_IndexLoanMember
Average daily loan balance outstanding | 4.3 us-gaap_LineOfCreditFacilityAverageOutstandingAmount / us-gaap_CreditFacilityAxis = smp_GeneralElectricCapitalCorporationCreditFacilityMember / us-gaap_VariableRateAxis = smp_IndexLoanMember | 3.3 us-gaap_LineOfCreditFacilityAverageOutstandingAmount / us-gaap_CreditFacilityAxis = smp_GeneralElectricCapitalCorporationCreditFacilityMember / us-gaap_VariableRateAxis = smp_IndexLoanMember | 4.4 us-gaap_LineOfCreditFacilityAverageOutstandingAmount / us-gaap_CreditFacilityAxis = smp_GeneralElectricCapitalCorporationCreditFacilityMember / us-gaap_VariableRateAxis = smp_IndexLoanMember
GE Canada Finance Holding Company Credit Facility [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Maximum borrowing capacity | 10 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = smp_GeCanadaFinanceHoldingCompanyCreditFacilityMember |  |
Outstanding borrowings under credit facility | $ 0 us-gaap_DebtInstrumentCarryingAmount / us-gaap_CreditFacilityAxis = smp_GeCanadaFinanceHoldingCompanyCreditFacilityMember |  |

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- Definition Represents the amount of borrowing availability, below which the Company is subject to financial covenants under the revolving credit facility. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
Name: | us-gaap_DebtInstrumentCarryingAmount
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Description of minimum financial levels (for example, tangible net worth and working capital) and achievement of certain financial ratios (for example, working capital ratio and debt service coverage ratio), and adherence to certain clauses which generally require or restrict certain actions (for example, entering into a debt arrangement with equal or greater seniority, and selling or discontinuing a certain business segment or material subsidiary) to be in compliance with the covenant clauses of the debt agreement. May also include a discussion of the adverse consequences that would result if the entity violates or fails to satisfy the covenants. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 + Details
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- Definition Average amount borrowed under the credit facility during the period. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- 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
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

X
- Definition The effective interest rate at the end of the reporting period. + 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
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
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- Details
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- 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
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Balance Type: | credit
Period Type: | instant

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- 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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: |
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Balance Type: |
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- Details
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