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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	$ 250us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Expiration date	Mar. 31, 2018
Additional available borrowing capacity	147.5us-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	71.6us-gaap_DebtInstrumentCarryingAmount / us-gaap_CreditFacilityAxis = smp_GeneralElectricCapitalCorporationCreditFacilityMember		56.6us-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	25smp_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	61.0us-gaap_DebtInstrumentCarryingAmount / us-gaap_CreditFacilityAxis = smp_GeneralElectricCapitalCorporationCreditFacilityMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember		53.0us-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	10.6us-gaap_DebtInstrumentCarryingAmount / us-gaap_CreditFacilityAxis = smp_GeneralElectricCapitalCorporationCreditFacilityMember / us-gaap_VariableRateAxis = smp_IndexLoanMember		3.6us-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	4.3us-gaap_LineOfCreditFacilityAverageOutstandingAmount / us-gaap_CreditFacilityAxis = smp_GeneralElectricCapitalCorporationCreditFacilityMember / us-gaap_VariableRateAxis = smp_IndexLoanMember	3.3us-gaap_LineOfCreditFacilityAverageOutstandingAmount / us-gaap_CreditFacilityAxis = smp_GeneralElectricCapitalCorporationCreditFacilityMember / us-gaap_VariableRateAxis = smp_IndexLoanMember	4.4us-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	10us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = smp_GeCanadaFinanceHoldingCompanyCreditFacilityMember
Outstanding borrowings under credit facility	$ 0us-gaap_DebtInstrumentCarryingAmount / us-gaap_CreditFacilityAxis = smp_GeCanadaFinanceHoldingCompanyCreditFacilityMember

X

- 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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Namespace Prefix:	smp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- 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

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Namespace Prefix:	us-gaap_
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

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Period Type:	duration

X

- Definition

Average amount borrowed under the credit facility during the period.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityAverageOutstandingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
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_
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Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_LineOfCreditFacilityLineItems
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Balance Type:	na
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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

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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

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Namespace Prefix:	us-gaap_
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Balance Type:	credit
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X

- Details

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