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Credit Facilities and Long-Term Debt, Deferred Financing Costs (Details) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Deferred Financing Costs [Abstract]
Deferred financing costs	$ 1.5	$ 1.6
Amortization of financing costs reminder of 2016	0.3
2017	0.3
2018	0.3
2019	0.3
2020	$ 0.3

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 fourth 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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Data Type:	xbrli:monetaryItemType
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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_
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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

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- References

No definition available.

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