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Credit Facilities and Long-Term Debt, Deferred Financing Costs (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Deferred Financing Costs [Abstract]
Deferred financing costs	$ 2.1us-gaap_DeferredFinanceCostsNet	$ 2.3us-gaap_DeferredFinanceCostsNet
Amortization of financing costs reminder of 2015	0.5smp_AmortizationOfFinancingCostsRemainderOfFiscalYear
Amortization of financing costs in 2016	0.7smp_AmortizationOfFinancingCostsNextTwelveMonths
Amortization of financing costs in 2017	0.7smp_AmortizationOfFinancingCostsYearTwo
Amortization of financing costs in 2018	$ 0.2smp_AmortizationOfFinancingCostsYearThree

X

- Definition

Amount of amortization expense expected to be recognized during the next fiscal year following the latest fiscal year for financing costs.

+ References

No definition available.

+ Details

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X

- Definition

Amount of amortization expense expected to be recognized in the remainder of the fiscal year following the latest fiscal year for financing costs.

+ References

No definition available.

+ Details

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X

- Definition

Amount of amortization expense expected to be recognized during the third fiscal year following the latest fiscal year for financing costs.

+ References

No definition available.

+ Details

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Namespace Prefix:	smp_
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X

- Definition

Amount of amortization expense expected to be recognized during the second fiscal year following the latest fiscal year for financing costs.

+ References

No definition available.

+ Details

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Namespace Prefix:	smp_
Data Type:	xbrli:monetaryItemType
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X

- Definition

For an unclassified balance sheet, the carrying amount (net of accumulated amortization) as of the balance sheet date of capitalized costs associated with the issuance of debt instruments (for example, legal, accounting, underwriting, printing, and registration costs) that will be charged against earnings over the life of the debt instruments to which such costs pertain.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28555-108399



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 210.5-02.17)

-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 17

-Article 5

+ Details

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