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Credit Facilities and Long-Term Debt, Deferred Financing Costs (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Deferred Financing Costs [Abstract]
Deferred financing costs	$ 1.0	$ 1.3
Amortization of financing costs reminder of 2017	0.1
2018	0.3
2019	0.3
2020	$ 0.3

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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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

Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ 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=64930785&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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