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Basis of Presentation (Details)	Mar. 31, 2013
Basis of Presentation [Abstract]
Equity ownership in entities included in consolidated financial statements, minimum (in hundredths)	50.00%

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- Definition

Minimum equity ownership percentage in the entities included in the consolidated financial statements.

+ References

No definition available.

+ Details

Name:	smp_EquityOwnershipInEntitiesIncludedInConsolidatedFinancialStatementsMinimum
Namespace Prefix:	smp_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

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- Details

Name:	us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration